Release v1.0.11: shared runtime diagnostics and media_assets probe helpers

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/publish.yml

@@ -4,9 +4,6 @@ on:
   push:
     branches:
       - main
-    tags:
-      - "v*"
-  workflow_dispatch:
 
 jobs:
   publish:

README.md

@@ -12,7 +12,7 @@ pip install jiangchang-platform-kit --index-url https://git.jc2009.com/api/packa
 
 ## 3. 包含的模块
 
-- **jiangchang_skill_core**：权益 HTTP 客户端、`enforce_entitlement`、统一文件日志、`JIANGCHANG_*` 数据根与技能根路径解析等，供 Skill CLI / 服务进程使用。
+- **jiangchang_skill_core**：权益 HTTP 客户端、`enforce_entitlement`、统一文件日志、`JIANGCHANG_*` 数据根与技能根路径解析、共享媒体资源（`media_assets`）等，供 Skill CLI / 服务进程使用。
 - **jiangchang_desktop_sdk**：匠厂桌面应用自动化客户端（基于 CDP + Playwright 同步 API）。**本包不声明 Playwright 依赖**；请在运行环境中自行安装 Playwright，以便 `import playwright` 可用。
 
 ## 4. 快速开始
@@ -78,17 +78,81 @@ assert_skill_env_file(ctx, ["API_KEY"])
 send_prompt_via_composer(page, "第一行\n第二行")
 ```
 
+## 共享媒体资源
+
+`jiangchang_skill_core.media_assets` 提供共享媒体资源解析能力。默认会从：
+
+`{JIANGCHANG_DATA_ROOT}/shared/media-assets`
+
+读取背景音乐、字体、水印和 ffmpeg 工具。
+
+如果目录不存在，会优先下载稳定 release bundle（不依赖用户电脑安装 Git）：
+
+`https://git.jc2009.com/client-commons/media-assets/releases/download/vlatest/media-assets.zip`
+
+bundle 内含背景音乐、字体与水印；**不包含** ffmpeg 二进制。ffmpeg / ffprobe 仍由 bundle 内 `manifest.json` 的 `tools.ffmpeg` 下载源单独拉取。
+
+可通过环境变量覆盖：
+
+- `MEDIA_ASSETS_ROOT=/path/to/custom/media-assets` — 本地资源目录
+- `MEDIA_ASSETS_BUNDLE_URL=https://example.com/media-assets.zip` — bundle 下载地址
+
+### Runtime diagnostics（统一 health 诊断）
+
+`jiangchang_skill_core.runtime_diagnostics` 提供各 Skill 共用的 Runtime / media-assets / ffmpeg 探测，避免每个技能各自复制检查逻辑。Skill 的 `health` 命令可调用：
+
+```python
+from jiangchang_skill_core import (
+    collect_runtime_diagnostics,
+    format_runtime_health_lines,
+    runtime_diagnostics_dict,
+)
+
+diag = collect_runtime_diagnostics(
+    skill_slug="my-skill",
+    platform_kit_min_version="1.0.10",  # 可选；省略则只报告当前版本
+    skill_root="/path/to/my-skill",     # 可选；用于检测 vendored jiangchang_skill_core
+)
+for line in format_runtime_health_lines(diag):
+    print(line)
+print(runtime_diagnostics_dict(diag))  # 可 JSON 序列化
+```
+
+诊断只读探测本地状态，不会触发 media-assets 下载。
+
+### 录屏合成（`screencast`）
+
+`run_screencast()` / `compose_video()` 通过 `jiangchang_skill_core.media_assets` 解析 ffmpeg 与背景音乐，**不使用系统 PATH 中的 `ffmpeg`**。
+
+- **默认**：不传 `media_assets_root` 时，使用 `{JIANGCHANG_DATA_ROOT}/shared/media-assets`（或进程环境中已有的 `MEDIA_ASSETS_ROOT`）。
+- **覆盖**：传入 `media_assets_root="/path/to/media-assets"`，或在 `compose_video(..., media_assets_env={"MEDIA_ASSETS_ROOT": "..."})` 中设置；参数 `media_assets_root` 优先于 `media_assets_env` 里已有的 `MEDIA_ASSETS_ROOT`。
+- `run_screencast(media_assets_root=...)` 会把该路径原样传给 `compose_video()`；`music_subdir` 已废弃（会触发 `DeprecationWarning`），音乐选择统一由 `pick_background_music()` 完成。
+
+```python
+from screencast import run_screencast
+
+run_screencast(
+    skill_slug="demo-skill",
+    subtitle_script=[("PASSED", "测试通过")],
+    pytest_args=["-q", "tests/test_demo.py"],
+    output_dir="./out",
+    media_assets_root="/path/to/media-assets",  # 可选
+)
+```
+
 ## 5. 发版流程（维护者）
 
 ### main 分支自动预发布
 
-每次推送到 `main` 会触发 `.github/workflows/publish.yml`，自动构建并发布 **唯一** 的 post 版本（基于 `pyproject.toml` 中的基础版本，例如 `0.1.0.post42`）。版本号不会写回仓库，仅在 CI 构建前临时改写 `pyproject.toml` 与 `jiangchang_desktop_sdk.__version__`。
+每次推送到 `main` 会触发 `.github/workflows/publish.yml`，自动构建并发布 **post 预发布版本**（仅供 CI 流水线内部使用，**不是**正式版本线）。
+
+正式版本线使用 **1.0.x** semver，通过 git tag 发布。
 
 ```bash
 git push origin main
 ```
 
-测试人员升级安装：
+测试人员升级安装（始终安装当前正式 tag 对应的版本，例如 `1.0.9`）：
 
 ```bash
 python -m pip install --upgrade \
@@ -99,11 +163,11 @@ python -m pip install --upgrade \
 
 ### 正式版本（tag）
 
-打 tag 并推送后，发布 **去掉 `v` 前缀** 的正式版本号（例如 `v0.1.1` → PyPI 包 `0.1.1`）：
+打 tag 并推送后，发布 **去掉 `v` 前缀** 的正式版本号（例如 `v1.0.9` → PyPI 包 `1.0.9`）：
 
 ```bash
-git tag v0.1.1
-git push origin v0.1.1
+git tag v1.0.9
+git push origin v1.0.9
 ```
 
 ### 安装后验证

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "jiangchang-platform-kit"
-version = "0.1.0"
+version = "1.0.11"
 description = "匠厂平台共享组件:Skill 实体 SDK + 桌面应用自动化 SDK"
 readme = "README.md"
 requires-python = ">=3.10"

src/jiangchang_desktop_sdk/__init__.py

@@ -23,7 +23,7 @@ __all__ = [
     "LaunchError",
     "GatewayDownError",
 ]
-__version__ = "0.1.0"
+__version__ = "1.0.9"
 
 
 def __getattr__(name: str):

src/jiangchang_skill_core/__init__.py

@@ -21,6 +21,30 @@ from .unified_logging import (
     setup_skill_logging,
     subprocess_env_with_trace,
 )
+from .media_assets import (
+    MediaAssetsStatus,
+    background_music_issue,
+    ensure_media_assets,
+    is_git_lfs_pointer,
+    is_usable_audio_file,
+    pick_background_music,
+    probe_background_music,
+    probe_ffmpeg,
+    probe_media_assets,
+    resolve_ffmpeg,
+    resolve_ffprobe,
+    resolve_media_assets_root,
+    resolve_music_dir,
+)
+from .runtime_diagnostics import (
+    RuntimeDiagnostics,
+    RuntimeIssue,
+    collect_runtime_diagnostics,
+    format_runtime_health_lines,
+    is_jiangchang_skill_core_from_skill_tree,
+    runtime_diagnostics_dict,
+    version_ge,
+)
 
 try:
     from . import rpa
@@ -33,6 +57,26 @@ __all__ = [
     "EntitlementError",
     "EntitlementResult",
     "EntitlementServiceError",
+    "MediaAssetsStatus",
+    "RuntimeDiagnostics",
+    "RuntimeIssue",
+    "background_music_issue",
+    "collect_runtime_diagnostics",
+    "ensure_media_assets",
+    "format_runtime_health_lines",
+    "is_git_lfs_pointer",
+    "is_jiangchang_skill_core_from_skill_tree",
+    "is_usable_audio_file",
+    "probe_background_music",
+    "probe_ffmpeg",
+    "probe_media_assets",
+    "pick_background_music",
+    "resolve_ffmpeg",
+    "resolve_ffprobe",
+    "resolve_media_assets_root",
+    "resolve_music_dir",
+    "runtime_diagnostics_dict",
+    "version_ge",
     "apply_cli_local_defaults",
     "attach_unified_file_handler",
     "ensure_env_file",

src/jiangchang_skill_core/config.py

@@ -69,6 +69,69 @@ def reset_cache() -> None:
     _example_defaults_cache = None
 
 
+def get_env_file_path() -> str | None:
+    return _env_file_path
+
+
+def get_example_path() -> str | None:
+    return _example_path
+
+
+def _iter_env_assignments(path: str) -> list[tuple[str, str]]:
+    """按文件顺序返回 (key, 完整赋值行)。"""
+    result: list[tuple[str, str]] = []
+    if not path or not os.path.isfile(path):
+        return result
+    with open(path, encoding="utf-8") as f:
+        for raw_line in f:
+            line = raw_line.rstrip("\n\r")
+            stripped = line.strip()
+            if not stripped or stripped.startswith("#"):
+                continue
+            if "=" not in stripped:
+                continue
+            key, _, _ = stripped.partition("=")
+            key = key.strip()
+            if key:
+                result.append((key, stripped))
+    return result
+
+
+def merge_missing_env_keys(
+    example_path: str,
+    dest_path: str,
+    *,
+    comment_skill: str | None = None,
+) -> list[str]:
+    """将 example 中有而用户 .env 没有的 key 追加到 dest 末尾，不修改已有项。"""
+    if not example_path or not os.path.isfile(example_path):
+        return []
+    if not dest_path or not os.path.isfile(dest_path):
+        return []
+
+    dest_keys = set(_parse_env_file(dest_path).keys())
+    to_append: list[tuple[str, str]] = []
+    for key, assignment in _iter_env_assignments(example_path):
+        if key not in dest_keys:
+            to_append.append((key, assignment))
+
+    if not to_append:
+        return []
+
+    header = (
+        f"# Added by {comment_skill} from .env.example"
+        if comment_skill
+        else "# Added from .env.example"
+    )
+    with open(dest_path, "a", encoding="utf-8") as f:
+        f.write("\n\n" + header + "\n")
+        for _, assignment in to_append:
+            f.write(assignment + "\n")
+
+    reset_cache()
+    return [key for key, _ in to_append]
+
+
 def ensure_env_file(skill_slug: str, example_path: str) -> str:
     """首次把 .env.example copy 到 {data_root}/{user}/{slug}/.env（已存在不覆盖），返回路径。"""
     global _skill_slug, _example_path, _env_file_path

src/jiangchang_skill_core/media_assets.py

@@ -0,0 +1,805 @@
+"""共享媒体资源解析：背景音乐、字体、水印与 ffmpeg 工具。"""
+
+from __future__ import annotations
+
+import fnmatch
+import json
+import os
+import platform
+import shutil
+import subprocess
+import sys
+import tempfile
+import urllib.error
+import urllib.request
+import zipfile
+from dataclasses import dataclass, field
+from datetime import datetime
+from pathlib import Path
+from typing import Any, Mapping, Optional
+
+MEDIA_ASSETS_BUNDLE_URL = (
+    "https://git.jc2009.com/client-commons/media-assets/releases/download/vlatest/media-assets.zip"
+)
+MEDIA_ASSETS_ZIP_URL = MEDIA_ASSETS_BUNDLE_URL
+MEDIA_ASSETS_GIT_URL = "https://git.jc2009.com/client-commons/media-assets"
+
+_WIN_DEFAULT_DATA_ROOT = Path(r"D:\jiangchang-data")
+_NON_WIN_DEFAULT_DATA_ROOT = Path.home() / ".jiangchang"
+
+_AUDIO_EXTENSIONS = {".mp3", ".wav", ".m4a", ".aac"}
+_GIT_LFS_POINTER_PREFIX = b"version https://git-lfs.github.com/spec/v1"
+_MIN_AUDIO_BYTES = 1024
+
+
+def is_git_lfs_pointer(path: str | Path) -> bool:
+    try:
+        head = Path(path).read_bytes()[:256]
+    except OSError:
+        return False
+    return head.startswith(_GIT_LFS_POINTER_PREFIX)
+
+
+_is_git_lfs_pointer = is_git_lfs_pointer
+
+
+def _enumerate_audio_like(music_dir: Path) -> list[Path]:
+    return [
+        path
+        for path in music_dir.rglob("*")
+        if path.is_file() and path.suffix.lower() in _AUDIO_EXTENSIONS
+    ]
+
+
+def _music_content_issue(music_dir: Optional[Path]) -> Optional[str]:
+    if music_dir is None or not music_dir.is_dir():
+        return "music_dir_missing"
+    files = _enumerate_audio_like(music_dir)
+    if not files:
+        return "background_music_dir_empty"
+    if all(_is_git_lfs_pointer(path) for path in files):
+        return "background_music_lfs_pointer_only"
+    if not any(_is_usable_audio_file(path) for path in files):
+        return "background_music_invalid"
+    return None
+
+
+def _music_is_ready(music_dir: Optional[Path]) -> bool:
+    return _music_content_issue(music_dir) is None
+
+
+def _needs_music_content_repair(status: MediaAssetsStatus) -> bool:
+    if status.music_dir is None:
+        return "music_dir_missing" in status.warnings
+    issue = _music_content_issue(status.music_dir)
+    return issue in (
+        "background_music_dir_empty",
+        "background_music_lfs_pointer_only",
+        "background_music_invalid",
+    )
+
+
+def is_usable_audio_file(path: str | Path, *, min_bytes: int = _MIN_AUDIO_BYTES) -> bool:
+    p = Path(path)
+    if not p.is_file():
+        return False
+    if p.suffix.lower() not in _AUDIO_EXTENSIONS:
+        return False
+    if is_git_lfs_pointer(p):
+        return False
+    try:
+        if p.stat().st_size < min_bytes:
+            return False
+    except OSError:
+        return False
+    return True
+
+
+_is_usable_audio_file = is_usable_audio_file
+
+
+@dataclass
+class MediaAssetsStatus:
+    root: Path
+    exists: bool
+    ready: bool
+    source: str
+    warnings: list[str] = field(default_factory=list)
+    ffmpeg_path: Optional[Path] = None
+    ffprobe_path: Optional[Path] = None
+    music_dir: Optional[Path] = None
+    music_ready: bool = False
+    fonts_dir: Optional[Path] = None
+    watermark_dir: Optional[Path] = None
+
+
+def _env_dict(env: dict[str, str] | None) -> dict[str, str]:
+    return env if env is not None else dict(os.environ)
+
+
+def _media_assets_bundle_url(env: dict[str, str] | None = None) -> str:
+    env_map = _env_dict(env)
+    override = (env_map.get("MEDIA_ASSETS_BUNDLE_URL") or "").strip()
+    return override or MEDIA_ASSETS_BUNDLE_URL
+
+
+def _resolve_jiangchang_data_root(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Path:
+    env_map = _env_dict(env)
+    from_env = (env_map.get("JIANGCHANG_DATA_ROOT") or "").strip()
+    if from_env:
+        return Path(from_env)
+    if data_root is not None:
+        return Path(data_root)
+    if sys.platform == "win32":
+        return _WIN_DEFAULT_DATA_ROOT
+    return _NON_WIN_DEFAULT_DATA_ROOT
+
+
+def resolve_media_assets_root(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Path:
+    env_map = _env_dict(env)
+    media_root = (env_map.get("MEDIA_ASSETS_ROOT") or "").strip()
+    if media_root:
+        return Path(media_root)
+    data = _resolve_jiangchang_data_root(data_root, env)
+    return data / "shared" / "media-assets"
+
+
+def _platform_bin_key() -> str:
+    system = platform.system().lower()
+    machine = platform.machine().lower()
+
+    if system == "windows":
+        if machine in {"amd64", "x86_64"}:
+            return "win32-x64"
+        if machine in {"arm64", "aarch64"}:
+            return "win32-arm64"
+    elif system == "darwin":
+        if machine in {"arm64", "aarch64"}:
+            return "darwin-arm64"
+        if machine in {"x86_64", "amd64"}:
+            return "darwin-x64"
+    elif system == "linux":
+        if machine in {"x86_64", "amd64"}:
+            return "linux-x64"
+        if machine in {"arm64", "aarch64"}:
+            return "linux-arm64"
+
+    return f"{system}-{machine}"
+
+
+def _tool_filename(name: str) -> str:
+    if platform.system().lower() == "windows":
+        return f"{name}.exe"
+    return name
+
+
+def _platform_tool_paths(root: Path) -> tuple[Path, Path]:
+    bin_key = _platform_bin_key()
+    bin_dir = root / "bin" / bin_key
+    return (
+        bin_dir / _tool_filename("ffmpeg"),
+        bin_dir / _tool_filename("ffprobe"),
+    )
+
+
+def _read_manifest(root: Path) -> dict | None:
+    manifest_path = root / "manifest.json"
+    if not manifest_path.is_file():
+        return None
+    try:
+        return json.loads(manifest_path.read_text(encoding="utf-8"))
+    except (OSError, json.JSONDecodeError):
+        return None
+
+
+def _ffmpeg_platform_spec(manifest: dict) -> dict | None:
+    tools = manifest.get("tools")
+    if not isinstance(tools, dict):
+        return None
+    ffmpeg = tools.get("ffmpeg")
+    if not isinstance(ffmpeg, dict):
+        return None
+    spec = ffmpeg.get(_platform_bin_key())
+    if isinstance(spec, dict):
+        return spec
+    return None
+
+
+def _manifest_tool_urls(spec: dict) -> list[tuple[str, str]]:
+    urls: list[tuple[str, str]] = []
+    raw_urls = spec.get("urls")
+    if isinstance(raw_urls, list):
+        for item in raw_urls:
+            if isinstance(item, dict):
+                name = str(item.get("name") or "source")
+                url = str(item.get("url") or "").strip()
+                if url:
+                    urls.append((name, url))
+    legacy = str(spec.get("url") or "").strip()
+    if legacy:
+        urls.append(("legacy", legacy))
+    return urls
+
+
+def _match_archive_member(member_name: str, pattern: str) -> bool:
+    normalized = member_name.replace("\\", "/").lstrip("/")
+    return fnmatch.fnmatch(normalized, pattern)
+
+
+def _extract_tool_members(
+    zip_path: Path,
+    archive_paths: dict[str, str],
+) -> dict[str, bytes]:
+    found: dict[str, bytes] = {}
+    with zipfile.ZipFile(zip_path, "r") as zf:
+        for tool_name, pattern in archive_paths.items():
+            if not isinstance(pattern, str) or not pattern:
+                continue
+            for info in zf.infolist():
+                if info.is_dir():
+                    continue
+                if _match_archive_member(info.filename, pattern):
+                    found[tool_name] = zf.read(info)
+                    break
+    return found
+
+
+def _try_download_ffmpeg_tools(root: Path, warnings: list[str]) -> bool:
+    manifest = _read_manifest(root)
+    if manifest is None:
+        warnings.append("ffmpeg_manifest_missing")
+        return False
+
+    spec = _ffmpeg_platform_spec(manifest)
+    if spec is None:
+        warnings.append("ffmpeg_manifest_missing")
+        return False
+
+    archive_paths = spec.get("archive_paths")
+    if not isinstance(archive_paths, dict):
+        warnings.append("ffmpeg_manifest_missing")
+        return False
+
+    urls = _manifest_tool_urls(spec)
+    if not urls:
+        warnings.append("ffmpeg_tool_download_failed")
+        return False
+
+    ffmpeg_path, ffprobe_path = _platform_tool_paths(root)
+    bin_dir = ffmpeg_path.parent
+    download_root = _download_dir(_shared_parent(root)) / "ffmpeg-tools"
+    download_root.mkdir(parents=True, exist_ok=True)
+
+    for source_name, url in urls:
+        zip_path = download_root / f"{source_name}.zip"
+        try:
+            if zip_path.exists():
+                zip_path.unlink()
+            _download_zip(url, zip_path)
+            members = _extract_tool_members(zip_path, archive_paths)
+            ffmpeg_bytes = members.get("ffmpeg")
+            ffprobe_bytes = members.get("ffprobe")
+            if not ffmpeg_bytes or not ffprobe_bytes:
+                continue
+            bin_dir.mkdir(parents=True, exist_ok=True)
+            ffmpeg_path.write_bytes(ffmpeg_bytes)
+            ffprobe_path.write_bytes(ffprobe_bytes)
+            shutil.rmtree(download_root, ignore_errors=True)
+            return True
+        except urllib.error.URLError:
+            continue
+        except (zipfile.BadZipFile, OSError, KeyError):
+            continue
+        except Exception:
+            continue
+
+    warnings.append("ffmpeg_tool_download_failed")
+    return False
+
+
+def _maybe_ensure_ffmpeg_tools(root: Path, status: MediaAssetsStatus) -> MediaAssetsStatus:
+    if status.ready:
+        return status
+    if not status.exists:
+        return status
+    if "ffmpeg_missing" not in status.warnings and "ffprobe_missing" not in status.warnings:
+        return status
+
+    warnings = list(status.warnings)
+    if _try_download_ffmpeg_tools(root, warnings):
+        refreshed = _inspect_media_assets(root, source=status.source)
+        for warning in warnings:
+            if warning not in refreshed.warnings:
+                refreshed.warnings.append(warning)
+        return refreshed
+
+    refreshed = _inspect_media_assets(root, source=status.source)
+    for warning in warnings:
+        if warning not in refreshed.warnings:
+            refreshed.warnings.append(warning)
+    return refreshed
+
+
+def _inspect_media_assets(root: Path, *, source: str) -> MediaAssetsStatus:
+    warnings: list[str] = []
+    exists = root.exists()
+    music_dir = root / "music"
+    fonts_dir = root / "fonts"
+    watermark_dir = root / "watermark"
+    ffmpeg_path, ffprobe_path = _platform_tool_paths(root)
+
+    music_exists = music_dir.is_dir()
+    fonts_exists = fonts_dir.is_dir()
+    watermark_exists = watermark_dir.is_dir()
+    ffmpeg_exists = ffmpeg_path.is_file()
+    ffprobe_exists = ffprobe_path.is_file()
+
+    if not music_exists:
+        warnings.append("music_dir_missing")
+    if not fonts_exists:
+        warnings.append("fonts_dir_missing")
+    if not watermark_exists:
+        warnings.append("watermark_dir_missing")
+    if not ffmpeg_exists:
+        warnings.append("ffmpeg_missing")
+    if not ffprobe_exists:
+        warnings.append("ffprobe_missing")
+
+    music_ready = False
+    if music_exists:
+        music_issue = _music_content_issue(music_dir)
+        if music_issue and music_issue != "music_dir_missing":
+            warnings.append(music_issue)
+        music_ready = music_issue is None
+
+    ready = (
+        exists
+        and music_exists
+        and fonts_exists
+        and watermark_exists
+        and ffmpeg_exists
+        and ffprobe_exists
+        and music_ready
+    )
+
+    return MediaAssetsStatus(
+        root=root,
+        exists=exists,
+        ready=ready,
+        source=source,
+        warnings=warnings,
+        ffmpeg_path=ffmpeg_path if ffmpeg_exists else None,
+        ffprobe_path=ffprobe_path if ffprobe_exists else None,
+        music_dir=music_dir if music_exists else None,
+        music_ready=music_ready,
+        fonts_dir=fonts_dir if fonts_exists else None,
+        watermark_dir=watermark_dir if watermark_exists else None,
+    )
+
+
+def _shared_parent(root: Path) -> Path:
+    return root.parent
+
+
+def _download_dir(shared: Path) -> Path:
+    return shared / ".media-assets-download"
+
+
+def _find_media_assets_root_in_tree(extracted: Path) -> Path | None:
+    if not extracted.is_dir():
+        return None
+
+    def _looks_like_assets(path: Path) -> bool:
+        if (path / "music").is_dir():
+            return True
+        if (path / "fonts").is_dir():
+            return True
+        if (path / "watermark").is_dir():
+            return True
+        if (path / "README.md").is_file():
+            return True
+        return False
+
+    if _looks_like_assets(extracted):
+        return extracted
+
+    children = [p for p in extracted.iterdir() if p.is_dir()]
+    for child in children:
+        if _looks_like_assets(child):
+            return child
+
+    for path in extracted.rglob("*"):
+        if path.is_dir() and _looks_like_assets(path):
+            return path
+    return None
+
+
+def _download_zip(url: str, dest: Path) -> None:
+    dest.parent.mkdir(parents=True, exist_ok=True)
+    with urllib.request.urlopen(url, timeout=120) as response:
+        dest.write_bytes(response.read())
+
+
+def _extract_zip(zip_path: Path, extract_to: Path) -> None:
+    extract_to.mkdir(parents=True, exist_ok=True)
+    with zipfile.ZipFile(zip_path, "r") as zf:
+        zf.extractall(extract_to)
+
+
+def _find_git_executable() -> Path | None:
+    git = shutil.which("git")
+    return Path(git) if git else None
+
+
+def _git_clone(url: str, target: Path) -> None:
+    target.parent.mkdir(parents=True, exist_ok=True)
+    subprocess.run(
+        ["git", "clone", url, str(target)],
+        check=True,
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    )
+
+
+def _git_pull(target: Path) -> None:
+    subprocess.run(
+        ["git", "pull"],
+        cwd=str(target),
+        check=True,
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    )
+
+
+def _is_git_repo(path: Path) -> bool:
+    return (path / ".git").exists()
+
+
+def _install_media_assets(source: Path, target: Path) -> None:
+    target.parent.mkdir(parents=True, exist_ok=True)
+    if not target.exists():
+        shutil.move(str(source), str(target))
+        return
+
+    timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
+    backup = target.parent / f"media-assets.backup-{timestamp}"
+    shutil.move(str(target), str(backup))
+    try:
+        shutil.move(str(source), str(target))
+    except Exception:
+        if backup.exists() and not target.exists():
+            shutil.move(str(backup), str(target))
+        raise
+    else:
+        shutil.rmtree(backup, ignore_errors=True)
+
+
+def _cleanup_download_artifacts(download_root: Path) -> None:
+    shutil.rmtree(download_root, ignore_errors=True)
+
+
+def _try_download_via_zip(
+    shared: Path,
+    target: Path,
+    warnings: list[str],
+    *,
+    env: dict[str, str] | None = None,
+    url: str | None = None,
+) -> bool:
+    download_root = _download_dir(shared)
+    download_root.mkdir(parents=True, exist_ok=True)
+    zip_path = download_root / "media-assets.zip"
+    extracted = download_root / "extracted"
+    staging = download_root / "staging"
+    bundle_url = url or _media_assets_bundle_url(env)
+
+    try:
+        if staging.exists():
+            shutil.rmtree(staging, ignore_errors=True)
+        if extracted.exists():
+            shutil.rmtree(extracted, ignore_errors=True)
+
+        _download_zip(bundle_url, zip_path)
+        _extract_zip(zip_path, extracted)
+
+        found = _find_media_assets_root_in_tree(extracted)
+        if found is None:
+            warnings.append("media_assets_zip_invalid_layout")
+            return False
+
+        if staging.exists():
+            shutil.rmtree(staging, ignore_errors=True)
+        shutil.copytree(found, staging)
+        _install_media_assets(staging, target)
+        _cleanup_download_artifacts(download_root)
+        return True
+    except urllib.error.URLError:
+        warnings.append("media_assets_zip_download_failed")
+        return False
+    except zipfile.BadZipFile:
+        warnings.append("media_assets_zip_extract_failed")
+        return False
+    except OSError:
+        warnings.append("media_assets_zip_extract_failed")
+        return False
+    except Exception:
+        warnings.append("media_assets_zip_extract_failed")
+        return False
+
+
+def _try_download_via_git(
+    target: Path,
+    warnings: list[str],
+    *,
+    clone: bool,
+) -> bool:
+    git_exe = _find_git_executable()
+    if git_exe is None:
+        warnings.append("git_not_available")
+        return False
+
+    try:
+        if clone:
+            if target.exists():
+                timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
+                partial = target.parent / f"media-assets.git-staging-{timestamp}"
+                if partial.exists():
+                    shutil.rmtree(partial, ignore_errors=True)
+                _git_clone(MEDIA_ASSETS_GIT_URL, partial)
+                _install_media_assets(partial, target)
+            else:
+                _git_clone(MEDIA_ASSETS_GIT_URL, target)
+        else:
+            _git_pull(target)
+        return True
+    except (subprocess.CalledProcessError, OSError):
+        if clone:
+            warnings.append("media_assets_git_clone_failed")
+        return False
+
+
+def _media_assets_root_overridden(env: dict[str, str] | None) -> bool:
+    env_map = _env_dict(env)
+    return bool((env_map.get("MEDIA_ASSETS_ROOT") or "").strip())
+
+
+def _needs_media_repo_content(status: MediaAssetsStatus) -> bool:
+    return any(
+        warning in status.warnings
+        for warning in (
+            "music_dir_missing",
+            "fonts_dir_missing",
+            "watermark_dir_missing",
+            "background_music_dir_empty",
+            "background_music_lfs_pointer_only",
+            "background_music_invalid",
+        )
+    )
+
+
+def _maybe_repair_music_content(
+    root: Path,
+    status: MediaAssetsStatus,
+    *,
+    env: dict[str, str] | None = None,
+) -> MediaAssetsStatus:
+    if not _needs_music_content_repair(status):
+        return status
+    if _media_assets_root_overridden(env):
+        return status
+
+    warnings: list[str] = []
+    if _is_git_repo(root) and root.exists():
+        if _try_download_via_git(root, warnings, clone=False):
+            refreshed = _inspect_media_assets(root, source="git")
+            for warning in warnings:
+                if warning not in refreshed.warnings:
+                    refreshed.warnings.append(warning)
+            return _maybe_ensure_ffmpeg_tools(root, refreshed)
+
+    shared = _shared_parent(root)
+    if _try_download_via_zip(shared, root, warnings, env=env):
+        refreshed = _inspect_media_assets(root, source="zip")
+        for warning in warnings:
+            if warning not in refreshed.warnings:
+                refreshed.warnings.append(warning)
+        return _maybe_ensure_ffmpeg_tools(root, refreshed)
+
+    refreshed = _inspect_media_assets(root, source=status.source)
+    for warning in warnings:
+        if warning not in refreshed.warnings:
+            refreshed.warnings.append(warning)
+    return refreshed
+
+
+def ensure_media_assets(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+    *,
+    update: bool = False,
+) -> MediaAssetsStatus:
+    env_map = _env_dict(env)
+    root = resolve_media_assets_root(data_root, env_map)
+    overridden = _media_assets_root_overridden(env_map)
+
+    status = _inspect_media_assets(root, source="local")
+    if overridden:
+        return _maybe_ensure_ffmpeg_tools(root, status)
+
+    if status.exists and not status.ready and not update and not _needs_media_repo_content(status):
+        return _maybe_ensure_ffmpeg_tools(root, status)
+
+    if status.ready and not update:
+        return status
+
+    if status.ready and update:
+        if _is_git_repo(root):
+            warnings: list[str] = []
+            if _try_download_via_git(root, warnings, clone=False):
+                return _maybe_ensure_ffmpeg_tools(
+                    root,
+                    _inspect_media_assets(root, source="git"),
+                )
+            status = _inspect_media_assets(root, source="local")
+            status.warnings.extend(warnings)
+            return _maybe_ensure_ffmpeg_tools(root, status)
+
+    shared = _shared_parent(root)
+    shared.mkdir(parents=True, exist_ok=True)
+    warnings: list[str] = []
+
+    if _try_download_via_zip(shared, root, warnings, env=env_map):
+        return _maybe_ensure_ffmpeg_tools(
+            root,
+            _maybe_repair_music_content(
+                root,
+                _inspect_media_assets(root, source="zip"),
+                env=env_map,
+            ),
+        )
+
+    clone_needed = not root.exists() or not status.ready or update
+    if _try_download_via_git(root, warnings, clone=clone_needed):
+        return _maybe_ensure_ffmpeg_tools(
+            root,
+            _maybe_repair_music_content(
+                root,
+                _inspect_media_assets(
+                    root,
+                    source="git" if _is_git_repo(root) else "local",
+                ),
+                env=env_map,
+            ),
+        )
+
+    final = _inspect_media_assets(root, source="local")
+    for warning in warnings:
+        if warning not in final.warnings:
+            final.warnings.append(warning)
+    repaired = _maybe_repair_music_content(root, final, env=env_map)
+    for warning in warnings:
+        if warning not in repaired.warnings:
+            repaired.warnings.append(warning)
+    return _maybe_ensure_ffmpeg_tools(root, repaired)
+
+
+def probe_media_assets(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> MediaAssetsStatus:
+    """只检查本地 media-assets 目录，不触发下载。"""
+    env_map = _env_dict(env)
+    root = resolve_media_assets_root(data_root, env_map)
+    return _inspect_media_assets(root, source="local")
+
+
+def probe_ffmpeg(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Optional[Path]:
+    status = probe_media_assets(data_root, env)
+    return status.ffmpeg_path
+
+
+def resolve_ffmpeg(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Optional[Path]:
+    status = ensure_media_assets(data_root, env)
+    return status.ffmpeg_path
+
+
+def resolve_ffprobe(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Optional[Path]:
+    status = ensure_media_assets(data_root, env)
+    return status.ffprobe_path
+
+
+def resolve_music_dir(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Optional[Path]:
+    status = ensure_media_assets(data_root, env)
+    return status.music_dir
+
+
+def probe_background_music(
+    root: str | Path | None = None,
+    *,
+    env: Mapping[str, str] | None = None,
+) -> dict[str, Any]:
+    """只读探测背景音乐目录，不触发 media-assets 下载。"""
+    env_map = _env_dict(dict(env) if env is not None else None)
+    if root is not None:
+        music_dir = Path(root) / "music"
+        if not music_dir.is_dir():
+            music_dir = Path(root) if Path(root).is_dir() else None
+    else:
+        data_root = (env_map.get("JIANGCHANG_DATA_ROOT") or env_map.get("CLAW_DATA_ROOT") or "").strip()
+        assets_root = resolve_media_assets_root(data_root or None, env_map)
+        status = _inspect_media_assets(assets_root, source="local")
+        music_dir = status.music_dir
+
+    music_root = str(music_dir) if music_dir is not None else None
+    if music_dir is None or not music_dir.is_dir():
+        return {
+            "music_root": music_root,
+            "mp3_count": 0,
+            "usable_count": 0,
+            "sample_path": None,
+            "issue": "music_dir_missing",
+        }
+
+    mp3_files = [path for path in music_dir.rglob("*.mp3") if path.is_file()]
+    usable = [path for path in music_dir.rglob("*") if is_usable_audio_file(path)]
+    issue = _music_content_issue(music_dir)
+    sample = str(sorted(usable, key=lambda p: str(p).lower())[0]) if usable else None
+    return {
+        "music_root": music_root,
+        "mp3_count": len(mp3_files),
+        "usable_count": len(usable),
+        "sample_path": sample,
+        "issue": issue,
+    }
+
+
+def background_music_issue(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Optional[str]:
+    """若 music 目录存在但无可用音频，返回标准 warning code。"""
+    if pick_background_music(data_root, env) is not None:
+        return None
+
+    status = ensure_media_assets(data_root, env)
+    return _music_content_issue(status.music_dir)
+
+
+def pick_background_music(
+    data_root: str | Path | None = None,
+    env: dict[str, str] | None = None,
+) -> Optional[Path]:
+    status = ensure_media_assets(data_root, env)
+    music_dir = status.music_dir
+    if music_dir is None or not music_dir.is_dir():
+        return None
+
+    candidates = [
+        path
+        for path in music_dir.rglob("*")
+        if _is_usable_audio_file(path)
+    ]
+
+    if not candidates:
+        return None
+
+    candidates.sort(key=lambda p: str(p).lower())
+    return candidates[0]

src/jiangchang_skill_core/rpa/video_session.py

@@ -4,8 +4,6 @@ from __future__ import annotations
 
 import asyncio
 import os
-import random
-import shutil
 import subprocess
 import sys
 import time
@@ -15,6 +13,12 @@ from pathlib import Path
 from typing import Any, Dict, IO, List, Optional
 
 from .. import config
+from ..media_assets import (
+    background_music_issue,
+    ensure_media_assets,
+    pick_background_music,
+    resolve_ffmpeg,
+)
 
 _JIANGCHANG_SUBTITLE_STYLE = (
     "FontName=Arial,FontSize=14,"
@@ -22,11 +26,6 @@ _JIANGCHANG_SUBTITLE_STYLE = (
     "Outline=2,Shadow=1,Alignment=2"
 )
 
-_DEFAULT_MUSIC_ROOT = os.environ.get(
-    "MEDIA_ASSETS_ROOT",
-    r"D:\OpenClaw\client-commons\media-assets",
-)
-
 _CAPTURE_FRAMERATE = 15
 
 
@@ -34,14 +33,23 @@ def _record_video_enabled() -> bool:
     return config.get_bool("OPENCLAW_RECORD_VIDEO", default=False)
 
 
-def _resolve_music_file() -> Optional[Path]:
-    music_dir = Path(_DEFAULT_MUSIC_ROOT) / "music"
-    if not music_dir.is_dir():
+def _resolve_ffmpeg_exe() -> Optional[Path]:
+    ffmpeg = resolve_ffmpeg()
+    if ffmpeg is None:
         return None
-    files = list(music_dir.rglob("*.mp3"))
-    if not files:
+    path = Path(ffmpeg)
+    return path if path.is_file() else None
+
+
+def _resolve_music_file(warnings: List[str]) -> Optional[Path]:
+    music = pick_background_music()
+    if music is not None:
+        return music
+
+    issue = background_music_issue()
+    if issue:
+        warnings.append(issue)
     return None
-    return random.choice(files)
 
 
 @dataclass
@@ -87,7 +95,12 @@ def _escape_srt_path(path: str) -> str:
     return path.replace("\\", "/").replace(":", "\\:")
 
 
-def _run_ffmpeg(cmd: List[str]) -> tuple[bool, str]:
+def _ffmpeg_cmd(ffmpeg_exe: Path, *args: str) -> List[str]:
+    return [str(ffmpeg_exe), *args]
+
+
+def _run_ffmpeg(ffmpeg_exe: Path, cmd_tail: List[str]) -> tuple[bool, str]:
+    cmd = _ffmpeg_cmd(ffmpeg_exe, *cmd_tail)
     try:
         result = subprocess.run(
             cmd,
@@ -104,12 +117,12 @@ def _run_ffmpeg(cmd: List[str]) -> tuple[bool, str]:
     return True, ""
 
 
-def _build_desktop_record_cmd(capture_path: str) -> Optional[List[str]]:
+def _build_desktop_record_cmd(ffmpeg_exe: Path, capture_path: str) -> Optional[List[str]]:
     """Windows gdigrab 全桌面录制；非 Windows 返回 None。"""
     if sys.platform != "win32":
         return None
-    return [
-        "ffmpeg",
+    return _ffmpeg_cmd(
+        ffmpeg_exe,
         "-y",
         "-f",
         "gdigrab",
@@ -124,10 +137,11 @@ def _build_desktop_record_cmd(capture_path: str) -> Optional[List[str]]:
         "-pix_fmt",
         "yuv420p",
         capture_path,
-    ]
+    )
 
 
 def _compose_capture_mp4(
+    ffmpeg_exe: Path,
     capture_path: Path,
     srt_path: Path,
     output_path: Path,
@@ -147,8 +161,7 @@ def _compose_capture_mp4(
             f"[0:v]{subtitle_filter}[vout];"
             f"[1:a]volume={music_volume},apad[aout]"
         )
-        cmd = [
-            "ffmpeg",
+        cmd_tail = [
             "-y",
             "-i",
             str(capture_path),
@@ -176,8 +189,7 @@ def _compose_capture_mp4(
             str(output_path),
         ]
     else:
-        cmd = [
-            "ffmpeg",
+        cmd_tail = [
             "-y",
             "-i",
             str(capture_path),
@@ -197,7 +209,7 @@ def _compose_capture_mp4(
             "yuv420p",
             str(output_path),
         ]
-    return _run_ffmpeg(cmd)
+    return _run_ffmpeg(ffmpeg_exe, cmd_tail)
 
 
 class RpaVideoSession:
@@ -287,11 +299,13 @@ class RpaVideoSession:
     def _start_ffmpeg_capture(self) -> None:
         if not self.enabled:
             return
-        if not shutil.which("ffmpeg"):
+
+        ffmpeg_exe = _resolve_ffmpeg_exe()
+        if ffmpeg_exe is None:
             self.warnings.append("ffmpeg_not_found")
             return
 
-        cmd = _build_desktop_record_cmd(self._capture_path)
+        cmd = _build_desktop_record_cmd(ffmpeg_exe, self._capture_path)
         if cmd is None:
             self._append_warning(
                 "ffmpeg_record_start_failed",
@@ -391,14 +405,21 @@ class RpaVideoSession:
             except Exception as exc:
                 self.warnings.append(f"subtitle_write_failed: {exc}")
 
-            music = _resolve_music_file()
-            if music is None:
+            music = _resolve_music_file(self.warnings)
+            if music is None and "background_music_lfs_pointer_only" not in self.warnings and "background_music_invalid" not in self.warnings:
                 self.warnings.append("background_music_missing")
 
+            ffmpeg_exe = _resolve_ffmpeg_exe()
+            if ffmpeg_exe is None:
+                self.warnings.append("ffmpeg_not_found")
+                self.artifacts = self.summary()
+                return
+
             srt_file = Path(self._srt_path)
             use_srt = srt_file.is_file() and srt_file.stat().st_size > 0
 
             ok, err = _compose_capture_mp4(
+                ffmpeg_exe,
                 capture,
                 srt_file if use_srt else Path(self._srt_path),
                 Path(self._planned_output),
@@ -407,6 +428,7 @@ class RpaVideoSession:
             if not ok and music is not None:
                 self.warnings.append(f"ffmpeg_with_music_failed: {err}")
                 ok, err = _compose_capture_mp4(
+                    ffmpeg_exe,
                     capture,
                     srt_file if use_srt else Path(self._srt_path),
                     Path(self._planned_output),
@@ -414,8 +436,8 @@ class RpaVideoSession:
                 )
             if not ok and not use_srt:
                 ok, err = _run_ffmpeg(
+                    ffmpeg_exe,
                     [
-                        "ffmpeg",
                         "-y",
                         "-i",
                         str(capture),
@@ -428,7 +450,7 @@ class RpaVideoSession:
                         "-pix_fmt",
                         "yuv420p",
                         str(self._planned_output),
-                    ]
+                    ],
                 )
             if not ok:
                 self._append_warning("ffmpeg_compose_failed", err)

src/jiangchang_skill_core/runtime_diagnostics.py

@@ -0,0 +1,321 @@
+"""共享 Runtime 诊断：health 输出与 media-assets / ffmpeg 探测。"""
+
+from __future__ import annotations
+
+import importlib.metadata
+import logging
+import os
+import sys
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any, Mapping
+
+import jiangchang_skill_core
+from .media_assets import probe_background_music, probe_media_assets, resolve_media_assets_root
+from .runtime_env import platform_default_data_root
+
+_SHARED_CORE_HINT = (
+    "jiangchang_skill_core is loaded from the skill tree; expected the shared "
+    "jiangchang-platform-kit installed in the host Python runtime."
+)
+
+
+@dataclass(frozen=True)
+class RuntimeIssue:
+    code: str
+    message: str
+    severity: str = "warning"
+
+
+@dataclass(frozen=True)
+class RuntimeDiagnostics:
+    skill_slug: str
+    python_executable: str
+    platform_kit_version: str | None
+    platform_kit_min_version: str | None
+    platform_kit_version_ok: bool | None
+    jiangchang_skill_core_file: str | None
+
+    claw_data_root: str | None
+    jiangchang_data_root: str | None
+    resolved_data_root: str | None
+
+    media_assets_root: str | None
+    ffmpeg_available: bool
+    ffmpeg_path: str | None
+
+    background_music_mp3_count: int
+    background_music_usable_count: int
+    background_music_issue: str | None
+    background_music_sample_path: str | None
+
+    record_video_enabled: bool
+    issues: tuple[RuntimeIssue, ...]
+
+    @property
+    def has_fatal_issues(self) -> bool:
+        return any(issue.severity == "error" for issue in self.issues)
+
+    def issue_codes(self) -> list[str]:
+        return [issue.code for issue in self.issues]
+
+
+def _env_dict(env: Mapping[str, str] | None) -> dict[str, str]:
+    return dict(env) if env is not None else dict(os.environ)
+
+
+def _resolve_data_root(env: Mapping[str, str]) -> str:
+    root = (env.get("CLAW_DATA_ROOT") or env.get("JIANGCHANG_DATA_ROOT") or "").strip()
+    if root:
+        return root
+    return platform_default_data_root()
+
+
+def _parse_version(version: str) -> tuple[int, ...]:
+    parts: list[int] = []
+    for piece in version.strip().split("."):
+        digits = ""
+        for ch in piece:
+            if ch.isdigit():
+                digits += ch
+            else:
+                break
+        if digits:
+            parts.append(int(digits))
+    return tuple(parts)
+
+
+def version_ge(installed: str, required: str) -> bool:
+    """Compare PEP 440-like versions without external deps (post release suffix ignored)."""
+    return _parse_version(installed) >= _parse_version(required)
+
+
+def _path_under(parent: str | Path, child: str | Path) -> bool:
+    try:
+        parent_path = Path(parent).resolve()
+        child_path = Path(child).resolve()
+        if sys.platform == "win32":
+            parent_norm = os.path.normcase(str(parent_path))
+            child_norm = os.path.normcase(str(child_path))
+            common = os.path.commonpath([parent_norm, child_norm])
+            return common == parent_norm
+        return os.path.commonpath([str(parent_path), str(child_path)]) == str(parent_path)
+    except (OSError, ValueError):
+        return False
+
+
+def is_jiangchang_skill_core_from_skill_tree(
+    *,
+    skill_root: str | Path,
+    core_file: str | Path | None = None,
+) -> bool:
+    """Return True when jiangchang_skill_core is loaded from inside skill_root."""
+    try:
+        root = Path(skill_root)
+        if not str(root).strip():
+            return False
+        core = Path(core_file) if core_file is not None else Path(jiangchang_skill_core.__file__)
+        return _path_under(root, core)
+    except (OSError, TypeError, ValueError):
+        return False
+
+
+def _platform_kit_version() -> str | None:
+    try:
+        return importlib.metadata.version("jiangchang-platform-kit")
+    except importlib.metadata.PackageNotFoundError:
+        return None
+
+
+def _bool_from_env(env: Mapping[str, str], key: str, default: bool = False) -> bool:
+    val = env.get(key)
+    if val is None or val == "":
+        return default
+    return str(val).strip().lower() in ("1", "true", "yes", "on")
+
+
+def collect_runtime_diagnostics(
+    *,
+    skill_slug: str,
+    platform_kit_min_version: str | None = None,
+    skill_root: str | Path | None = None,
+    record_video: bool | None = None,
+    env: Mapping[str, str] | None = None,
+) -> RuntimeDiagnostics:
+    env_map = _env_dict(env)
+    issues: list[RuntimeIssue] = []
+
+    claw_data_root = env_map.get("CLAW_DATA_ROOT")
+    jiangchang_data_root = env_map.get("JIANGCHANG_DATA_ROOT")
+    resolved_data_root = _resolve_data_root(env_map)
+
+    media_root_path = resolve_media_assets_root(resolved_data_root, env_map)
+    media_status = probe_media_assets(resolved_data_root, env_map)
+    ffmpeg_path_obj = media_status.ffmpeg_path
+    ffmpeg_ok = ffmpeg_path_obj is not None and ffmpeg_path_obj.is_file()
+
+    music_probe = probe_background_music(media_root_path, env=env_map)
+    mp3_count = int(music_probe["mp3_count"])
+    usable_count = int(music_probe["usable_count"])
+    music_issue = music_probe.get("issue")
+    music_sample = music_probe.get("sample_path")
+
+    if music_issue is None and not media_status.music_ready and media_status.warnings:
+        for warning in media_status.warnings:
+            if warning.startswith("background_music") or warning == "music_dir_missing":
+                music_issue = warning
+                break
+
+    platform_version = _platform_kit_version()
+    platform_ok: bool | None
+    if platform_kit_min_version is None:
+        platform_ok = None
+    elif platform_version is None:
+        platform_ok = False
+    else:
+        platform_ok = version_ge(platform_version, platform_kit_min_version)
+
+    if platform_version is None:
+        issues.append(
+            RuntimeIssue(
+                code="platform_kit_not_installed",
+                message="jiangchang-platform-kit package metadata not found",
+                severity="error",
+            )
+        )
+    elif platform_kit_min_version is not None and not platform_ok:
+        issues.append(
+            RuntimeIssue(
+                code="platform_kit_version_low",
+                message=(
+                    f"jiangchang-platform-kit version {platform_version} "
+                    f"is below required {platform_kit_min_version}"
+                ),
+                severity="error",
+            )
+        )
+
+    core_file: str | None
+    try:
+        core_file = os.path.abspath(jiangchang_skill_core.__file__)
+    except (OSError, TypeError, ValueError):
+        core_file = None
+
+    if skill_root is not None and core_file is not None:
+        if is_jiangchang_skill_core_from_skill_tree(skill_root=skill_root, core_file=core_file):
+            issues.append(
+                RuntimeIssue(
+                    code="jiangchang_skill_core_loaded_from_skill_tree",
+                    message=_SHARED_CORE_HINT,
+                    severity="warning",
+                )
+            )
+
+    if record_video is None:
+        record_video_enabled = _bool_from_env(env_map, "OPENCLAW_RECORD_VIDEO", False)
+    else:
+        record_video_enabled = record_video
+
+    if not ffmpeg_ok:
+        severity = "warning"
+        message = "ffmpeg not available"
+        if record_video_enabled:
+            message = "OPENCLAW_RECORD_VIDEO enabled but ffmpeg is not available"
+        issues.append(
+            RuntimeIssue(
+                code="ffmpeg_unavailable",
+                message=message,
+                severity=severity,
+            )
+        )
+
+    if record_video_enabled and music_issue:
+        issues.append(
+            RuntimeIssue(
+                code="background_music_unavailable",
+                message=f"background music unavailable: {music_issue}",
+                severity="warning",
+            )
+        )
+
+    return RuntimeDiagnostics(
+        skill_slug=skill_slug,
+        python_executable=sys.executable,
+        platform_kit_version=platform_version,
+        platform_kit_min_version=platform_kit_min_version,
+        platform_kit_version_ok=platform_ok,
+        jiangchang_skill_core_file=core_file,
+        claw_data_root=claw_data_root,
+        jiangchang_data_root=jiangchang_data_root,
+        resolved_data_root=resolved_data_root,
+        media_assets_root=str(media_root_path),
+        ffmpeg_available=ffmpeg_ok,
+        ffmpeg_path=str(ffmpeg_path_obj) if ffmpeg_path_obj else None,
+        background_music_mp3_count=mp3_count,
+        background_music_usable_count=usable_count,
+        background_music_issue=str(music_issue) if music_issue else None,
+        background_music_sample_path=str(music_sample) if music_sample else None,
+        record_video_enabled=record_video_enabled,
+        issues=tuple(issues),
+    )
+
+
+def format_runtime_health_lines(diagnostics: RuntimeDiagnostics) -> list[str]:
+    lines = [
+        f"skill_slug: {diagnostics.skill_slug}",
+        f"python_executable: {diagnostics.python_executable}",
+        f"platform_kit_version: {diagnostics.platform_kit_version or ''}",
+        f"platform_kit_min_version: {diagnostics.platform_kit_min_version or ''}",
+        f"platform_kit_version_ok: {diagnostics.platform_kit_version_ok}",
+        f"jiangchang_skill_core_file: {diagnostics.jiangchang_skill_core_file or ''}",
+        f"CLAW_DATA_ROOT: {diagnostics.claw_data_root or ''}",
+        f"JIANGCHANG_DATA_ROOT: {diagnostics.jiangchang_data_root or ''}",
+        f"resolved_data_root: {diagnostics.resolved_data_root or ''}",
+        f"media_assets_root: {diagnostics.media_assets_root or ''}",
+        f"ffmpeg_available: {diagnostics.ffmpeg_available}",
+        f"ffmpeg_path: {diagnostics.ffmpeg_path or ''}",
+        f"background_music_mp3_count: {diagnostics.background_music_mp3_count}",
+        f"background_music_usable_count: {diagnostics.background_music_usable_count}",
+        f"background_music_issue: {diagnostics.background_music_issue or ''}",
+        f"background_music_sample_path: {diagnostics.background_music_sample_path or ''}",
+        f"record_video_enabled: {diagnostics.record_video_enabled}",
+    ]
+    for issue in diagnostics.issues:
+        lines.append(f"runtime_issue[{issue.severity}]: {issue.code} — {issue.message}")
+    return lines
+
+
+def runtime_diagnostics_dict(diagnostics: RuntimeDiagnostics) -> dict[str, Any]:
+    return {
+        "skill_slug": diagnostics.skill_slug,
+        "python_executable": diagnostics.python_executable,
+        "platform_kit_version": diagnostics.platform_kit_version,
+        "platform_kit_min_version": diagnostics.platform_kit_min_version,
+        "platform_kit_version_ok": diagnostics.platform_kit_version_ok,
+        "jiangchang_skill_core_file": diagnostics.jiangchang_skill_core_file,
+        "CLAW_DATA_ROOT": diagnostics.claw_data_root,
+        "JIANGCHANG_DATA_ROOT": diagnostics.jiangchang_data_root,
+        "resolved_data_root": diagnostics.resolved_data_root,
+        "media_assets_root": diagnostics.media_assets_root,
+        "ffmpeg_available": diagnostics.ffmpeg_available,
+        "ffmpeg_path": diagnostics.ffmpeg_path,
+        "background_music_mp3_count": diagnostics.background_music_mp3_count,
+        "background_music_usable_count": diagnostics.background_music_usable_count,
+        "background_music_issue": diagnostics.background_music_issue,
+        "background_music_sample_path": diagnostics.background_music_sample_path,
+        "record_video_enabled": diagnostics.record_video_enabled,
+        "runtime_issues": [
+            {"code": issue.code, "message": issue.message, "severity": issue.severity}
+            for issue in diagnostics.issues
+        ],
+    }
+
+
+def log_runtime_diagnostics(
+    diagnostics: RuntimeDiagnostics,
+    logger: logging.Logger | None = None,
+    level: int = logging.INFO,
+) -> None:
+    log = logger or logging.getLogger("jiangchang_skill_core.runtime_diagnostics")
+    for line in format_runtime_health_lines(diagnostics):
+        log.log(level, line)

src/jiangchang_skill_core/runtime_env.py

@@ -34,14 +34,22 @@ def platform_default_data_root() -> str:
 
 
 def get_data_root() -> str:
-    env = (os.getenv("JIANGCHANG_DATA_ROOT") or "").strip()
+    env = (
+        os.getenv("CLAW_DATA_ROOT")
+        or os.getenv("JIANGCHANG_DATA_ROOT")
+        or ""
+    ).strip()
     if env:
         return env
     return platform_default_data_root()
 
 
 def get_user_id() -> str:
-    return (os.getenv("JIANGCHANG_USER_ID") or "").strip() or "_anon"
+    return (
+        os.getenv("CLAW_USER_ID")
+        or os.getenv("JIANGCHANG_USER_ID")
+        or ""
+    ).strip() or "_anon"
 
 
 def _looks_like_skills_root(path: str) -> bool:
@@ -55,6 +63,7 @@ def _looks_like_skills_root(path: str) -> bool:
         "toutiao-publisher",
         "logistics-tracker",
         "api-key-vault",
+        "receive-order",
     ):
         if os.path.isdir(os.path.join(path, marker)):
             return True
@@ -130,10 +139,21 @@ def apply_cli_local_defaults() -> None:
         enabled = v in ("1", "true", "yes", "on")
     if not enabled:
         return
-    if not (os.getenv("JIANGCHANG_DATA_ROOT") or "").strip():
-        os.environ["JIANGCHANG_DATA_ROOT"] = platform_default_data_root()
-    if not (os.getenv("JIANGCHANG_USER_ID") or "").strip():
+    if not (
+        os.getenv("CLAW_DATA_ROOT")
+        or os.getenv("JIANGCHANG_DATA_ROOT")
+        or ""
+    ).strip():
+        default_root = platform_default_data_root()
+        os.environ["JIANGCHANG_DATA_ROOT"] = default_root
+        os.environ.setdefault("CLAW_DATA_ROOT", default_root)
+    if not (
+        os.getenv("CLAW_USER_ID")
+        or os.getenv("JIANGCHANG_USER_ID")
+        or ""
+    ).strip():
         os.environ["JIANGCHANG_USER_ID"] = DEFAULT_LOCAL_USER_ID.strip()
+        os.environ.setdefault("CLAW_USER_ID", DEFAULT_LOCAL_USER_ID.strip())
 def find_chrome_executable() -> "str | None":
     """查找系统已安装的 Chrome 或 Edge 可执行文件路径。
 

src/screencast/composer.py

@@ -1,16 +1,18 @@
 """FFmpeg 合成：帧序列 + SRT 字幕 + 背景音乐 → MP4。"""
 from __future__ import annotations
 
-import random
 import subprocess
 import sys
+from dataclasses import dataclass, field
 from pathlib import Path
 
+from jiangchang_skill_core.media_assets import (
+    background_music_issue,
+    pick_background_music,
+    resolve_ffmpeg,
+)
 
 # 匠厂统一字幕样式 —— 所有 skill 录屏共用，做品牌一致性
-# FontSize 14：1080p 屏幕约占 1.3% 高度，演示视频留足画面呼吸感
-# Outline 2：14 号字配 Outline 3 会显胖，2 已足够在浅色背景上保持可读
-# 修改请评估对所有 skill 录屏的影响。
 _JIANGCHANG_SUBTITLE_STYLE = (
     "FontName=Arial,FontSize=14,"
     "PrimaryColour=&H00FFFFFF,OutlineColour=&H00000000,"
@@ -18,63 +20,155 @@ _JIANGCHANG_SUBTITLE_STYLE = (
 )
 
 
+@dataclass
+class ComposeVideoResult:
+    output_path: str
+    warnings: list[str] = field(default_factory=list)
+
+
+def _escape_srt_path(path: str) -> str:
+    return path.replace("\\", "/").replace(":", "\\:")
+
+
+def _run_ffmpeg(ffmpeg_exe: Path, cmd_tail: list[str]) -> tuple[bool, str]:
+    cmd = [str(ffmpeg_exe), *cmd_tail]
+    try:
+        result = subprocess.run(
+            cmd,
+            capture_output=True,
+            text=True,
+            encoding="utf-8",
+            errors="replace",
+        )
+    except FileNotFoundError:
+        return False, "ffmpeg not found"
+    if result.returncode != 0:
+        err = (result.stderr or result.stdout or "").strip()
+        return False, err[:500] if err else f"exit {result.returncode}"
+    return True, ""
+
+
+def _media_assets_env(
+    media_assets_root: str | Path | None,
+    media_assets_env: dict[str, str] | None,
+) -> dict[str, str] | None:
+    if media_assets_root is None and media_assets_env is None:
+        return None
+    env = dict(media_assets_env or {})
+    if media_assets_root is not None:
+        env["MEDIA_ASSETS_ROOT"] = str(media_assets_root)
+    return env
+
+
 def compose_video(
     frames_dir: str,
     fps: int,
     subtitle_path: str,
-    music_dir: str,
     output_path: str,
+    *,
     music_volume: float = 0.15,
-) -> str:
-    frames_dir = Path(frames_dir)
-    subtitle_path = Path(subtitle_path)
-    output_path = Path(output_path)
-    output_path.parent.mkdir(parents=True, exist_ok=True)
+    allow_no_music: bool = True,
+    media_assets_root: str | Path | None = None,
+    media_assets_env: dict[str, str] | None = None,
+) -> ComposeVideoResult:
+    """合成 MP4；ffmpeg 与背景音乐均走 jiangchang_skill_core.media_assets。"""
+    frames_dir_path = Path(frames_dir)
+    subtitle_path_obj = Path(subtitle_path)
+    output_path_obj = Path(output_path)
+    output_path_obj.parent.mkdir(parents=True, exist_ok=True)
+    warnings: list[str] = []
 
-    # 随机选一首背景音乐
-    music_files = list(Path(music_dir).rglob("*.mp3"))
-    if not music_files:
-        raise FileNotFoundError(f"music_dir 下没有找到 MP3 文件: {music_dir}")
-    music_file = random.choice(music_files)
-    print(f"[screencast] 背景音乐: {music_file.name}")
+    assets_env = _media_assets_env(media_assets_root, media_assets_env)
 
-    # FFmpeg 字幕路径在 Windows 下需要转义冒号（subtitles 滤镜内部语法）
-    srt_path_str = str(subtitle_path).replace("\\", "/").replace(":", "\\:")
+    ffmpeg_exe = resolve_ffmpeg(env=assets_env)
+    if ffmpeg_exe is None or not Path(ffmpeg_exe).is_file():
+        raise RuntimeError("ffmpeg_not_found")
 
+    ffmpeg_path = Path(ffmpeg_exe)
+    music_file = pick_background_music(env=assets_env)
+    if music_file is None:
+        issue = background_music_issue(env=assets_env)
+        if issue:
+            warnings.append(issue)
+        else:
+            warnings.append("background_music_missing")
+        if not allow_no_music:
+            raise FileNotFoundError(warnings[-1])
+
+    srt_esc = _escape_srt_path(str(subtitle_path_obj.resolve()))
     subtitle_filter = (
-        f"subtitles='{srt_path_str}'"
+        f"subtitles='{srt_esc}'"
         f":force_style='{_JIANGCHANG_SUBTITLE_STYLE}'"
     )
 
-    # 视频和音频都放进 filter_complex，避免 -vf 与 -filter_complex 混用报错
+    if music_file and music_file.is_file():
         filter_complex = (
             f"[0:v]{subtitle_filter}[vout];"
             f"[1:a]volume={music_volume},apad[aout]"
         )
-
-    cmd = [
-        "ffmpeg", "-y",
-        "-framerate", str(fps),
-        "-i", str(frames_dir / "frame_%06d.png"),
-        "-i", str(music_file),
-        "-filter_complex", filter_complex,
-        "-map", "[vout]",
-        "-map", "[aout]",
-        "-c:v", "libx264",
-        "-preset", "fast",
-        "-crf", "23",
-        "-c:a", "aac",
-        "-b:a", "128k",
+        cmd_tail = [
+            "-y",
+            "-framerate",
+            str(fps),
+            "-i",
+            str(frames_dir_path / "frame_%06d.png"),
+            "-i",
+            str(music_file),
+            "-filter_complex",
+            filter_complex,
+            "-map",
+            "[vout]",
+            "-map",
+            "[aout]",
+            "-c:v",
+            "libx264",
+            "-preset",
+            "fast",
+            "-crf",
+            "23",
+            "-c:a",
+            "aac",
+            "-b:a",
+            "128k",
             "-shortest",
-        "-pix_fmt", "yuv420p",
-        str(output_path),
+            "-pix_fmt",
+            "yuv420p",
+            str(output_path_obj),
         ]
+        ok, err = _run_ffmpeg(ffmpeg_path, cmd_tail)
+        if not ok:
+            warnings.append(f"ffmpeg_with_music_failed: {err}")
+            if not allow_no_music:
+                raise RuntimeError(f"ffmpeg_compose_failed: {err}")
+            music_file = None
+        else:
+            print(f"[screencast] 背景音乐: {music_file.name}")
+            print(f"[screencast] 输出: {output_path_obj}")
+            return ComposeVideoResult(str(output_path_obj.resolve()), warnings)
 
-    print(f"[screencast] 运行 FFmpeg 合成...")
-    result = subprocess.run(cmd, capture_output=True, text=True, encoding="utf-8", errors="replace")
-    if result.returncode != 0:
-        print(result.stderr, file=sys.stderr)
-        raise RuntimeError(f"FFmpeg 合成失败，退出码 {result.returncode}")
+    cmd_tail = [
+        "-y",
+        "-framerate",
+        str(fps),
+        "-i",
+        str(frames_dir_path / "frame_%06d.png"),
+        "-vf",
+        subtitle_filter,
+        "-c:v",
+        "libx264",
+        "-preset",
+        "fast",
+        "-crf",
+        "23",
+        "-pix_fmt",
+        "yuv420p",
+        str(output_path_obj),
+    ]
+    print("[screencast] 运行 FFmpeg 合成（无背景音乐）...")
+    ok, err = _run_ffmpeg(ffmpeg_path, cmd_tail)
+    if not ok:
+        print(err, file=sys.stderr)
+        raise RuntimeError(f"ffmpeg_compose_failed: {err}")
 
-    print(f"[screencast] 输出: {output_path}")
-    return str(output_path)
+    print(f"[screencast] 输出: {output_path_obj}")
+    return ComposeVideoResult(str(output_path_obj.resolve()), warnings)

src/screencast/runner.py

@@ -30,6 +30,8 @@ def _ensure_sdk_on_path() -> None:
 _ensure_sdk_on_path()
 from jiangchang_desktop_sdk.window_win32 import activate_and_maximize_jiangchang_window  # noqa: E402
 
+import warnings
+
 from .composer import compose_video
 from .recorder import ScreenRecorder
 from .subtitle import SubtitleEngine
@@ -54,10 +56,11 @@ def run_screencast(
         subtitle_script:  [(关键词, 字幕文案), ...] 按顺序匹配 pytest stdout
         pytest_args:      传递给 pytest 的参数列表
         output_dir:       最终 MP4 输出目录
-        media_assets_root: media-assets 仓库本地路径；
-                           不传时读 MEDIA_ASSETS_ROOT 环境变量，
-                           再不存在则用默认值 D:\\OpenClaw\\client-commons\\media-assets
-        music_subdir:     music_assets_root 下音乐子目录，默认 "music"
+        media_assets_root: media-assets 根目录；不传时使用
+                           ``resolve_media_assets_root()`` 默认路径
+                           （JIANGCHANG_DATA_ROOT/shared/media-assets 或 MEDIA_ASSETS_ROOT）
+        music_subdir:     **已废弃**，保留仅为兼容旧调用；背景音乐由
+                          ``media_assets.pick_background_music()`` 统一解析
         fps:               截帧帧率，默认 10
         activate_window:   录屏开始前是否自动激活+最大化匠厂窗口（默认 True；
                           Windows 走 ctypes，非 Windows 走 jiangchang:// 协议）
@@ -67,13 +70,14 @@ def run_screencast(
     Returns:
         输出 MP4 的绝对路径
     """
-    if media_assets_root is None:
-        media_assets_root = os.environ.get(
-            "MEDIA_ASSETS_ROOT",
-            r"D:\OpenClaw\client-commons\media-assets",
+    if music_subdir != "music":
+        warnings.warn(
+            "music_subdir is deprecated and ignored; "
+            "background music is resolved via media_assets.pick_background_music()",
+            DeprecationWarning,
+            stacklevel=2,
         )
 
-    music_dir = str(Path(media_assets_root) / music_subdir)
     output_dir_path = Path(output_dir)
     output_dir_path.mkdir(parents=True, exist_ok=True)
 
@@ -135,8 +139,8 @@ def run_screencast(
             frames_dir=frames_dir,
             fps=fps,
             subtitle_path=str(subtitle_file),
-            music_dir=music_dir,
             output_path=str(output_mp4),
+            media_assets_root=media_assets_root,
         )
 
     return str(output_mp4)

tests/test_config.py

@@ -81,6 +81,27 @@ class TestConfig(unittest.TestCase):
             self.assertEqual(config.get_float("BAD", 9.9), 9.9)
             self.assertEqual(config.get_int("BAD", 7), 7)
 
+    def test_merge_missing_env_keys_appends_only_new(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            example = os.path.join(tmp, ".env.example")
+            dest = os.path.join(tmp, ".env")
+            with open(example, "w", encoding="utf-8") as f:
+                f.write("EXISTING=1\nNEW_KEY=abc\n")
+            with open(dest, "w", encoding="utf-8") as f:
+                f.write("EXISTING=keep\n")
+
+            added = config.merge_missing_env_keys(
+                example,
+                dest,
+                comment_skill="demo-skill",
+            )
+            self.assertEqual(added, ["NEW_KEY"])
+            with open(dest, encoding="utf-8") as f:
+                content = f.read()
+            self.assertIn("EXISTING=keep", content)
+            self.assertIn("NEW_KEY=abc", content)
+            self.assertIn("Added by demo-skill", content)
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_media_assets.py

@@ -0,0 +1,437 @@
+# -*- coding: utf-8 -*-
+"""media_assets 共享媒体资源解析测试。"""
+from __future__ import annotations
+
+import json
+import platform
+import zipfile
+from pathlib import Path
+from unittest.mock import patch
+
+import pytest
+
+from jiangchang_skill_core import media_assets as ma
+
+
+def _make_complete_assets(root: Path, *, with_ffmpeg: bool = True, with_ffprobe: bool = True) -> None:
+    (root / "music" / "calm").mkdir(parents=True)
+    (root / "music" / "calm" / "track.mp3").write_bytes(b"x" * 1024)
+    (root / "fonts").mkdir(parents=True)
+    (root / "watermark").mkdir(parents=True)
+    bin_key = ma._platform_bin_key()
+    bin_dir = root / "bin" / bin_key
+    bin_dir.mkdir(parents=True)
+    if with_ffmpeg:
+        (bin_dir / ma._tool_filename("ffmpeg")).write_bytes(b"ffmpeg")
+    if with_ffprobe:
+        (bin_dir / ma._tool_filename("ffprobe")).write_bytes(b"ffprobe")
+
+
+def _sample_manifest() -> dict:
+    bin_key = ma._platform_bin_key()
+    return {
+        "name": "media-assets",
+        "version": "0.2.0",
+        "directories": {"music": "music", "fonts": "fonts", "watermark": "watermark"},
+        "tools": {
+            "ffmpeg": {
+                bin_key: {
+                    "package": "ffmpeg-release-essentials",
+                    "archive_type": "zip",
+                    "urls": [{"name": "test", "url": "https://example.test/ffmpeg.zip"}],
+                    "archive_paths": {
+                        "ffmpeg": "*/bin/ffmpeg.exe",
+                        "ffprobe": "*/bin/ffprobe.exe",
+                    },
+                }
+            }
+        },
+    }
+
+
+def _install_tools_from_manifest(root: Path, warnings: list[str]) -> bool:
+    bin_key = ma._platform_bin_key()
+    bin_dir = root / "bin" / bin_key
+    bin_dir.mkdir(parents=True, exist_ok=True)
+    (bin_dir / ma._tool_filename("ffmpeg")).write_bytes(b"ffmpeg")
+    (bin_dir / ma._tool_filename("ffprobe")).write_bytes(b"ffprobe")
+    return True
+
+
+def _build_archive_zip(dest: Path, inner_name: str) -> None:
+    manifest = _sample_manifest()
+    with zipfile.ZipFile(dest, "w") as zf:
+        zf.writestr(f"{inner_name}/README.md", "# media-assets\n")
+        zf.writestr(f"{inner_name}/manifest.json", json.dumps(manifest, ensure_ascii=False))
+        zf.writestr(f"{inner_name}/music/calm/track.mp3", b"x" * 1024)
+        zf.writestr(f"{inner_name}/fonts/.keep", "")
+        zf.writestr(f"{inner_name}/watermark/.keep", "")
+
+
+def test_default_bundle_url_is_release() -> None:
+    url = ma._media_assets_bundle_url()
+    assert url == ma.MEDIA_ASSETS_BUNDLE_URL
+    assert url.endswith("/releases/download/vlatest/media-assets.zip")
+    assert "/archive/main.zip" not in url
+
+
+def test_bundle_url_env_override() -> None:
+    override = "https://example.com/media-assets.zip"
+    assert ma._media_assets_bundle_url(env={"MEDIA_ASSETS_BUNDLE_URL": override}) == override
+
+
+def test_zip_download_uses_bundle_url_override(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    data_root = tmp_path / "data"
+    shared = data_root / "shared"
+    target = shared / "media-assets"
+    archive = tmp_path / "media-assets.zip"
+    override = "https://example.com/media-assets.zip"
+
+    _build_archive_zip(archive, "media-assets")
+    captured_urls: list[str] = []
+
+    def _fake_download(url: str, dest: Path) -> None:
+        captured_urls.append(url)
+        dest.write_bytes(archive.read_bytes())
+
+    monkeypatch.setattr(ma, "_download_zip", _fake_download)
+    monkeypatch.setattr(ma, "_find_git_executable", lambda: None)
+    monkeypatch.setattr(ma, "_try_download_ffmpeg_tools", _install_tools_from_manifest)
+
+    env = {
+        "JIANGCHANG_DATA_ROOT": str(data_root),
+        "MEDIA_ASSETS_BUNDLE_URL": override,
+    }
+    status = ma.ensure_media_assets(env=env)
+    assert captured_urls == [override]
+    assert target.is_dir()
+    assert status.ready is True
+
+
+def test_media_assets_root_env_priority(tmp_path: Path) -> None:
+    custom = tmp_path / "custom-media"
+    custom.mkdir()
+    env = {
+        "MEDIA_ASSETS_ROOT": str(custom),
+        "JIANGCHANG_DATA_ROOT": str(tmp_path / "data"),
+    }
+    assert ma.resolve_media_assets_root(env=env) == custom
+
+
+def test_default_media_assets_path(tmp_path: Path) -> None:
+    env = {"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")}
+    expected = tmp_path / "data" / "shared" / "media-assets"
+    assert ma.resolve_media_assets_root(env=env) == expected
+
+
+def test_complete_assets_skips_download(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root)
+
+    def _fail_download(*args, **kwargs):
+        raise AssertionError("download should not be called")
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", _fail_download)
+    monkeypatch.setattr(ma, "_try_download_via_git", _fail_download)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert status.ready is True
+    assert status.warnings == []
+    assert status.source == "local"
+
+
+def test_missing_ffmpeg_warning(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root, with_ffmpeg=False)
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", lambda *a, **k: False)
+    monkeypatch.setattr(ma, "_try_download_via_git", lambda *a, **k: False)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert status.ready is False
+    assert "ffmpeg_missing" in status.warnings
+
+
+def test_missing_ffprobe_warning(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root, with_ffprobe=False)
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", lambda *a, **k: False)
+    monkeypatch.setattr(ma, "_try_download_via_git", lambda *a, **k: False)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert status.ready is False
+    assert "ffprobe_missing" in status.warnings
+
+
+def test_pick_background_music_stable_first(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root)
+    music = root / "music"
+    (music / "b-upbeat.mp3").write_bytes(b"x" * 1024)
+    (music / "calm" / "a-calm.mp3").write_bytes(b"x" * 1024)
+    (music / "z-last.wav").write_bytes(b"x" * 1024)
+
+    monkeypatch.setattr(
+        ma,
+        "ensure_media_assets",
+        lambda *a, **k: ma._inspect_media_assets(root, source="local"),
+    )
+
+    picked = ma.pick_background_music(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert picked == music / "b-upbeat.mp3"
+
+
+@pytest.mark.parametrize("inner_name", ["media-assets", "media-assets-main"])
+def test_zip_wrapper_layout_detected(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+    inner_name: str,
+) -> None:
+    data_root = tmp_path / "data"
+    shared = data_root / "shared"
+    target = shared / "media-assets"
+    archive = tmp_path / "media-assets.zip"
+
+    _build_archive_zip(archive, inner_name)
+
+    def _fake_download(url: str, dest: Path) -> None:
+        dest.write_bytes(archive.read_bytes())
+
+    monkeypatch.setattr(ma, "_download_zip", _fake_download)
+    monkeypatch.setattr(ma, "_find_git_executable", lambda: None)
+    monkeypatch.setattr(ma, "_try_download_ffmpeg_tools", _install_tools_from_manifest)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(data_root)})
+    assert target.is_dir()
+    assert status.ready is True
+    assert status.source == "zip"
+    assert "media_assets_zip_invalid_layout" not in status.warnings
+
+
+def test_zip_download_failure_returns_warning(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    import urllib.error
+
+    def _raise_url_error(url: str, dest: Path) -> None:
+        raise urllib.error.URLError("network down")
+
+    monkeypatch.setattr(ma, "_download_zip", _raise_url_error)
+    monkeypatch.setattr(ma, "_find_git_executable", lambda: None)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert status.ready is False
+    assert "media_assets_zip_download_failed" in status.warnings
+    assert "git_not_available" in status.warnings
+
+
+def test_git_not_available_when_zip_fails(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    import urllib.error
+
+    monkeypatch.setattr(
+        ma,
+        "_download_zip",
+        lambda url, dest: (_ for _ in ()).throw(urllib.error.URLError("fail")),
+    )
+    monkeypatch.setattr(ma, "_find_git_executable", lambda: None)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert "git_not_available" in status.warnings
+
+
+def test_media_assets_root_override_no_download(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    custom = tmp_path / "override"
+    custom.mkdir()
+
+    def _fail_download(*args, **kwargs):
+        raise AssertionError("download should not be called when MEDIA_ASSETS_ROOT is set")
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", _fail_download)
+
+    status = ma.ensure_media_assets(env={"MEDIA_ASSETS_ROOT": str(custom)})
+    assert status.root == custom
+    assert status.exists is True
+
+
+@pytest.mark.skipif(platform.system().lower() != "windows", reason="Windows default path check")
+def test_windows_default_data_root() -> None:
+    with patch.dict("os.environ", {}, clear=True):
+        root = ma.resolve_media_assets_root()
+    assert root == Path(r"D:\jiangchang-data") / "shared" / "media-assets"
+
+
+def test_probe_media_assets_does_not_download(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    def _fail_download(*args, **kwargs):
+        raise AssertionError("download should not be called")
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", _fail_download)
+    monkeypatch.setattr(ma, "_try_download_via_git", _fail_download)
+
+    status = ma.probe_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert status.exists is False
+    assert status.ffmpeg_path is None
+
+
+def test_lfs_pointer_warning_in_probe_and_ensure(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root)
+    music = root / "music"
+    (music / "calm" / "track.mp3").unlink()
+    (music / "lfs-only.mp3").write_text(
+        "version https://git-lfs.github.com/spec/v1\noid sha256:abc\nsize 123\n"
+    )
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", lambda *a, **k: False)
+    monkeypatch.setattr(ma, "_try_download_via_git", lambda *a, **k: False)
+
+    probed = ma.probe_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert "background_music_lfs_pointer_only" in probed.warnings
+    assert probed.music_ready is False
+
+    ensured = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert "background_music_lfs_pointer_only" in ensured.warnings
+    assert ensured.ready is False
+
+
+def test_pick_background_music_skips_lfs_pointer(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root, with_ffmpeg=True, with_ffprobe=True)
+    music = root / "music"
+    (music / "calm" / "track.mp3").unlink()
+    (music / "real.mp3").write_bytes(b"x" * 1024)
+    lfs = music / "lfs-only.mp3"
+    lfs.write_text("version https://git-lfs.github.com/spec/v1\noid sha256:abc\nsize 123\n")
+
+    monkeypatch.setattr(
+        ma,
+        "ensure_media_assets",
+        lambda *a, **k: ma._inspect_media_assets(root, source="local"),
+    )
+
+    picked = ma.pick_background_music(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert picked == music / "real.mp3"
+
+
+def test_pick_background_music_no_valid_files(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    _make_complete_assets(root)
+    music = root / "music"
+    (music / "calm" / "track.mp3").unlink()
+    (music / "pointer.mp3").write_text(
+        "version https://git-lfs.github.com/spec/v1\noid sha256:abc\nsize 123\n"
+    )
+
+    monkeypatch.setattr(
+        ma,
+        "ensure_media_assets",
+        lambda *a, **k: ma._inspect_media_assets(root, source="local"),
+    )
+
+    picked = ma.pick_background_music(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert picked is None
+
+
+def test_video_finalize_without_music_fallback(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    import asyncio
+    import os
+    import tempfile
+    from pathlib import Path
+
+    from jiangchang_skill_core import config
+    from jiangchang_skill_core.rpa.video_session import RpaVideoSession
+
+    ffmpeg_exe = tmp_path / "ffmpeg.exe"
+    ffmpeg_exe.write_bytes(b"ffmpeg")
+
+    def _fake_resolve_ffmpeg(*args, **kwargs):
+        return ffmpeg_exe
+
+    def _fake_pick_music(*args, **kwargs):
+        return None
+
+    monkeypatch.setattr(
+        "jiangchang_skill_core.rpa.video_session.resolve_ffmpeg",
+        _fake_resolve_ffmpeg,
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.rpa.video_session.pick_background_music",
+        _fake_pick_music,
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.rpa.video_session.background_music_issue",
+        lambda *a, **k: None,
+    )
+
+    os.environ["OPENCLAW_RECORD_VIDEO"] = "1"
+    try:
+        config.reset_cache()
+        with tempfile.TemporaryDirectory() as skill_data:
+            session = RpaVideoSession(
+                skill_slug="receive-order",
+                skill_data_dir=skill_data,
+                batch_id="batch_no_music",
+            )
+            capture = Path(session._capture_path)
+            capture.parent.mkdir(parents=True, exist_ok=True)
+            capture.write_bytes(b"\x00" * 64)
+
+            monkeypatch.setattr(
+                "jiangchang_skill_core.rpa.video_session._compose_capture_mp4",
+                lambda *a, **k: (True, ""),
+            )
+
+            asyncio.run(session.finalize())
+            assert "background_music_missing" in session.warnings
+            assert session.output_video_path is not None
+    finally:
+        os.environ.pop("OPENCLAW_RECORD_VIDEO", None)
+        config.reset_cache()
+
+
+def test_manifest_ffmpeg_download(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    root = tmp_path / "data" / "shared" / "media-assets"
+    (root / "music" / "calm").mkdir(parents=True)
+    (root / "music" / "calm" / "track.mp3").write_bytes(b"x" * 1024)
+    (root / "fonts").mkdir(parents=True)
+    (root / "watermark").mkdir(parents=True)
+    (root / "manifest.json").write_text(
+        json.dumps(_sample_manifest(), ensure_ascii=False),
+        encoding="utf-8",
+    )
+
+    monkeypatch.setattr(ma, "_try_download_via_zip", lambda *a, **k: False)
+    monkeypatch.setattr(ma, "_try_download_via_git", lambda *a, **k: False)
+    monkeypatch.setattr(ma, "_try_download_ffmpeg_tools", _install_tools_from_manifest)
+
+    status = ma.ensure_media_assets(env={"JIANGCHANG_DATA_ROOT": str(tmp_path / "data")})
+    assert status.ready is True
+    assert status.ffmpeg_path is not None
+    assert status.ffprobe_path is not None
+
+
+def test_is_usable_audio_file_rejects_small_and_lfs(tmp_path: Path) -> None:
+    small = tmp_path / "small.mp3"
+    small.write_bytes(b"x" * 512)
+    assert ma.is_usable_audio_file(small) is False
+
+    ok = tmp_path / "ok.mp3"
+    ok.write_bytes(b"x" * 1024)
+    assert ma.is_usable_audio_file(ok) is True
+
+    lfs = tmp_path / "lfs.mp3"
+    lfs.write_text("version https://git-lfs.github.com/spec/v1\noid sha256:abc\nsize 123\n")
+    assert ma.is_usable_audio_file(lfs) is False
+    assert ma.is_git_lfs_pointer(lfs) is True
+
+
+def test_probe_background_music_structure(tmp_path: Path) -> None:
+    root = tmp_path / "media-assets"
+    music = root / "music" / "calm"
+    music.mkdir(parents=True)
+    (music / "track.mp3").write_bytes(b"x" * 1024)
+
+    probe = ma.probe_background_music(root)
+    assert probe["music_root"] == str(root / "music")
+    assert probe["mp3_count"] == 1
+    assert probe["usable_count"] == 1
+    assert probe["issue"] is None
+    assert probe["sample_path"] == str(music / "track.mp3")

tests/test_runtime_diagnostics.py

@@ -0,0 +1,313 @@
+# -*- coding: utf-8 -*-
+"""runtime_diagnostics 公共 Runtime / media-assets 诊断测试。"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from unittest.mock import patch
+
+import pytest
+
+import jiangchang_skill_core
+from jiangchang_skill_core import media_assets as ma
+from jiangchang_skill_core.runtime_diagnostics import (
+    RuntimeDiagnostics,
+    RuntimeIssue,
+    collect_runtime_diagnostics,
+    format_runtime_health_lines,
+    is_jiangchang_skill_core_from_skill_tree,
+    runtime_diagnostics_dict,
+    version_ge,
+)
+
+
+def test_version_ge_post_release() -> None:
+    assert version_ge("1.0.10.post23", "1.0.10") is True
+    assert version_ge("1.0.10", "1.0.10") is True
+    assert version_ge("1.0.9.post19", "1.0.10") is False
+
+
+def test_is_jiangchang_skill_core_from_skill_tree(tmp_path: Path) -> None:
+    skill_root = tmp_path / "my-skill"
+    inside = skill_root / "scripts" / "jiangchang_skill_core" / "__init__.py"
+    inside.parent.mkdir(parents=True)
+    inside.write_text("# vendored\n", encoding="utf-8")
+    outside = tmp_path / "site-packages" / "jiangchang_skill_core" / "__init__.py"
+    outside.parent.mkdir(parents=True)
+    outside.write_text("# shared\n", encoding="utf-8")
+
+    assert is_jiangchang_skill_core_from_skill_tree(
+        skill_root=skill_root,
+        core_file=inside,
+    ) is True
+    assert is_jiangchang_skill_core_from_skill_tree(
+        skill_root=skill_root,
+        core_file=outside,
+    ) is False
+
+
+def test_collect_runtime_diagnostics_json_serializable(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    data_root = tmp_path / "data"
+    env = {
+        "CLAW_DATA_ROOT": str(data_root),
+        "OPENCLAW_RECORD_VIDEO": "0",
+    }
+    media_root = data_root / "shared" / "media-assets"
+    (media_root / "music").mkdir(parents=True)
+
+    def _fake_probe_media_assets(data_root_arg=None, env_arg=None):
+        return ma.MediaAssetsStatus(
+            root=media_root,
+            exists=True,
+            ready=False,
+            source="local",
+            warnings=["ffmpeg_missing"],
+            ffmpeg_path=None,
+            music_dir=media_root / "music",
+            music_ready=False,
+        )
+
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_media_assets",
+        _fake_probe_media_assets,
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_background_music",
+        lambda *a, **k: {
+            "music_root": str(media_root / "music"),
+            "mp3_count": 0,
+            "usable_count": 0,
+            "sample_path": None,
+            "issue": "background_music_dir_empty",
+        },
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics._platform_kit_version",
+        lambda: "1.0.10",
+    )
+
+    diag = collect_runtime_diagnostics(
+        skill_slug="my-skill",
+        platform_kit_min_version="1.0.9",
+        env=env,
+    )
+    payload = runtime_diagnostics_dict(diag)
+    json.dumps(payload)
+    assert payload["skill_slug"] == "my-skill"
+    assert payload["resolved_data_root"] == str(data_root)
+    assert payload["platform_kit_version_ok"] is True
+
+
+def test_platform_kit_min_version_none_skips_version_issue(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    env = {"CLAW_DATA_ROOT": str(tmp_path / "data")}
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_media_assets",
+        lambda *a, **k: ma.MediaAssetsStatus(
+            root=tmp_path,
+            exists=False,
+            ready=False,
+            source="local",
+        ),
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_background_music",
+        lambda *a, **k: {
+            "music_root": None,
+            "mp3_count": 0,
+            "usable_count": 0,
+            "sample_path": None,
+            "issue": "music_dir_missing",
+        },
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics._platform_kit_version",
+        lambda: "1.0.8",
+    )
+
+    diag = collect_runtime_diagnostics(skill_slug="my-skill", env=env)
+    assert diag.platform_kit_version_ok is None
+    assert "platform_kit_version_low" not in diag.issue_codes()
+
+
+def test_platform_kit_missing_records_issue(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    env = {"CLAW_DATA_ROOT": str(tmp_path / "data")}
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_media_assets",
+        lambda *a, **k: ma.MediaAssetsStatus(
+            root=tmp_path,
+            exists=False,
+            ready=False,
+            source="local",
+        ),
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_background_music",
+        lambda *a, **k: {
+            "music_root": None,
+            "mp3_count": 0,
+            "usable_count": 0,
+            "sample_path": None,
+            "issue": None,
+        },
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics._platform_kit_version",
+        lambda: None,
+    )
+
+    diag = collect_runtime_diagnostics(
+        skill_slug="my-skill",
+        platform_kit_min_version="1.0.10",
+        env=env,
+    )
+    assert "platform_kit_not_installed" in diag.issue_codes()
+
+
+def test_record_video_ffmpeg_and_music_warnings_not_fatal(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    media_root = tmp_path / "shared" / "media-assets"
+    env = {"CLAW_DATA_ROOT": str(tmp_path), "OPENCLAW_RECORD_VIDEO": "1"}
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_media_assets",
+        lambda *a, **k: ma.MediaAssetsStatus(
+            root=media_root,
+            exists=True,
+            ready=False,
+            source="local",
+            warnings=["ffmpeg_missing", "music_dir_missing"],
+            ffmpeg_path=None,
+            music_dir=None,
+        ),
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_background_music",
+        lambda *a, **k: {
+            "music_root": None,
+            "mp3_count": 0,
+            "usable_count": 0,
+            "sample_path": None,
+            "issue": "music_dir_missing",
+        },
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics._platform_kit_version",
+        lambda: "1.0.10",
+    )
+
+    diag = collect_runtime_diagnostics(skill_slug="my-skill", env=env)
+    codes = diag.issue_codes()
+    assert "ffmpeg_unavailable" in codes
+    assert "background_music_unavailable" in codes
+    assert diag.has_fatal_issues is False
+    ffmpeg_issue = next(i for i in diag.issues if i.code == "ffmpeg_unavailable")
+    assert ffmpeg_issue.severity == "warning"
+
+
+def test_skill_tree_core_issue_when_skill_root_given(tmp_path: Path) -> None:
+    skill_root = tmp_path / "my-skill"
+    fake_core = skill_root / "scripts" / "jiangchang_skill_core" / "__init__.py"
+    fake_core.parent.mkdir(parents=True)
+    fake_core.write_text("# vendored\n", encoding="utf-8")
+
+    env = {"CLAW_DATA_ROOT": str(tmp_path / "data")}
+    with patch.object(jiangchang_skill_core, "__file__", str(fake_core)):
+        diag = collect_runtime_diagnostics(
+            skill_slug="my-skill",
+            skill_root=skill_root,
+            record_video=False,
+            env=env,
+        )
+    assert "jiangchang_skill_core_loaded_from_skill_tree" in diag.issue_codes()
+
+
+def test_format_runtime_health_lines_core_fields(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    env = {"CLAW_DATA_ROOT": str(tmp_path / "data")}
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_media_assets",
+        lambda *a, **k: ma.MediaAssetsStatus(
+            root=tmp_path,
+            exists=False,
+            ready=False,
+            source="local",
+        ),
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics.probe_background_music",
+        lambda *a, **k: {
+            "music_root": None,
+            "mp3_count": 0,
+            "usable_count": 0,
+            "sample_path": None,
+            "issue": None,
+        },
+    )
+    monkeypatch.setattr(
+        "jiangchang_skill_core.runtime_diagnostics._platform_kit_version",
+        lambda: "1.0.10",
+    )
+
+    diag = collect_runtime_diagnostics(skill_slug="my-skill", env=env)
+    text = "\n".join(format_runtime_health_lines(diag))
+    for marker in (
+        "python_executable:",
+        "platform_kit_version:",
+        "resolved_data_root:",
+        "media_assets_root:",
+        "ffmpeg_available:",
+        "background_music_mp3_count:",
+    ):
+        assert marker in text
+
+
+def test_background_music_lfs_and_size_rules(tmp_path: Path) -> None:
+    music = tmp_path / "music"
+    music.mkdir()
+    (music / "tiny.mp3").write_bytes(b"x" * 512)
+    (music / "lfs.mp3").write_text(
+        "version https://git-lfs.github.com/spec/v1\noid sha256:abc\nsize 123\n"
+    )
+    (music / "ok.mp3").write_bytes(b"x" * 1024)
+
+    probe = ma.probe_background_music(tmp_path)
+    assert probe["mp3_count"] == 3
+    assert probe["usable_count"] == 1
+    assert probe["sample_path"] == str(music / "ok.mp3")
+
+
+def test_runtime_diagnostics_frozen_dataclass() -> None:
+    diag = RuntimeDiagnostics(
+        skill_slug="x",
+        python_executable="python",
+        platform_kit_version="1.0.10",
+        platform_kit_min_version=None,
+        platform_kit_version_ok=None,
+        jiangchang_skill_core_file=None,
+        claw_data_root=None,
+        jiangchang_data_root=None,
+        resolved_data_root="/tmp",
+        media_assets_root="/tmp/media",
+        ffmpeg_available=False,
+        ffmpeg_path=None,
+        background_music_mp3_count=0,
+        background_music_usable_count=0,
+        background_music_issue=None,
+        background_music_sample_path=None,
+        record_video_enabled=False,
+        issues=(RuntimeIssue(code="ffmpeg_unavailable", message="no ffmpeg"),),
+    )
+    assert diag.has_fatal_issues is False
+    assert diag.issue_codes() == ["ffmpeg_unavailable"]

tests/test_screencast_composer.py

@@ -0,0 +1,252 @@
+# -*- coding: utf-8 -*-
+"""screencast composer 媒体资源集成测试。"""
+from __future__ import annotations
+
+from pathlib import Path
+from unittest.mock import patch
+
+from screencast.composer import ComposeVideoResult, compose_video
+
+
+def _write_frame(frames_dir: Path) -> None:
+    frames_dir.mkdir(parents=True, exist_ok=True)
+    (frames_dir / "frame_000001.png").write_bytes(b"png")
+
+
+def _write_srt(path: Path) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text("1\n00:00:00,000 --> 00:00:02,000\nhello\n", encoding="utf-8")
+
+
+def test_compose_video_uses_absolute_ffmpeg(tmp_path: Path) -> None:
+    frames = tmp_path / "frames"
+    srt = tmp_path / "out.srt"
+    output = tmp_path / "final.mp4"
+    ffmpeg = tmp_path / "ffmpeg.exe"
+    ffmpeg.write_bytes(b"ffmpeg")
+    _write_frame(frames)
+    _write_srt(srt)
+
+    captured: list[list[str]] = []
+
+    def _fake_run(ffmpeg_exe: Path, cmd_tail: list[str]) -> tuple[bool, str]:
+        captured.append([str(ffmpeg_exe), *cmd_tail])
+        output.write_bytes(b"mp4")
+        return True, ""
+
+    with patch("screencast.composer.resolve_ffmpeg", return_value=ffmpeg), patch(
+        "screencast.composer.pick_background_music",
+        return_value=None,
+    ), patch("screencast.composer.background_music_issue", return_value="background_music_missing"), patch(
+        "screencast.composer._run_ffmpeg",
+        side_effect=_fake_run,
+    ):
+        result = compose_video(
+            frames_dir=str(frames),
+            fps=10,
+            subtitle_path=str(srt),
+            output_path=str(output),
+        )
+
+    assert isinstance(result, ComposeVideoResult)
+    assert captured
+    assert captured[0][0] == str(ffmpeg)
+    assert "background_music_missing" in result.warnings
+
+
+def test_compose_video_with_music(tmp_path: Path) -> None:
+    frames = tmp_path / "frames"
+    srt = tmp_path / "out.srt"
+    output = tmp_path / "final.mp4"
+    ffmpeg = tmp_path / "ffmpeg.exe"
+    music = tmp_path / "music.mp3"
+    ffmpeg.write_bytes(b"ffmpeg")
+    music.write_bytes(b"x" * 256)
+    _write_frame(frames)
+    _write_srt(srt)
+
+    with patch("screencast.composer.resolve_ffmpeg", return_value=ffmpeg), patch(
+        "screencast.composer.pick_background_music",
+        return_value=music,
+    ), patch(
+        "screencast.composer._run_ffmpeg",
+        return_value=(True, ""),
+    ):
+        result = compose_video(
+            frames_dir=str(frames),
+            fps=10,
+            subtitle_path=str(srt),
+            output_path=str(output),
+        )
+        output.write_bytes(b"mp4")
+        assert result.warnings == []
+
+
+def test_compose_video_music_failure_fallback(tmp_path: Path) -> None:
+    frames = tmp_path / "frames"
+    srt = tmp_path / "out.srt"
+    output = tmp_path / "final.mp4"
+    ffmpeg = tmp_path / "ffmpeg.exe"
+    music = tmp_path / "music.mp3"
+    ffmpeg.write_bytes(b"ffmpeg")
+    music.write_bytes(b"x" * 256)
+    _write_frame(frames)
+    _write_srt(srt)
+
+    calls = {"count": 0}
+
+    def _fake_run(ffmpeg_exe: Path, cmd_tail: list[str]) -> tuple[bool, str]:
+        calls["count"] += 1
+        if calls["count"] == 1:
+            return False, "music mux failed"
+        output.write_bytes(b"mp4")
+        return True, ""
+
+    with patch("screencast.composer.resolve_ffmpeg", return_value=ffmpeg), patch(
+        "screencast.composer.pick_background_music",
+        return_value=music,
+    ), patch(
+        "screencast.composer._run_ffmpeg",
+        side_effect=_fake_run,
+    ):
+        result = compose_video(
+            frames_dir=str(frames),
+            fps=10,
+            subtitle_path=str(srt),
+            output_path=str(output),
+        )
+
+    assert any("ffmpeg_with_music_failed" in w for w in result.warnings)
+    assert calls["count"] == 2
+
+
+def test_compose_video_passes_media_assets_root_to_media_apis(tmp_path: Path) -> None:
+    frames = tmp_path / "frames"
+    srt = tmp_path / "out.srt"
+    output = tmp_path / "final.mp4"
+    custom_root = tmp_path / "custom-media-assets"
+    custom_root.mkdir()
+    ffmpeg = custom_root / "ffmpeg.exe"
+    ffmpeg.write_bytes(b"ffmpeg")
+    _write_frame(frames)
+    _write_srt(srt)
+
+    captured_env: list[dict[str, str] | None] = []
+
+    def _capture_env(*args, **kwargs):
+        captured_env.append(kwargs.get("env"))
+        if len(captured_env) == 1:
+            return ffmpeg
+        if len(captured_env) == 2:
+            return None
+        return "background_music_missing"
+
+    with patch("screencast.composer.resolve_ffmpeg", side_effect=_capture_env), patch(
+        "screencast.composer.pick_background_music",
+        side_effect=_capture_env,
+    ), patch(
+        "screencast.composer.background_music_issue",
+        side_effect=_capture_env,
+    ), patch(
+        "screencast.composer._run_ffmpeg",
+        return_value=(True, ""),
+    ):
+        compose_video(
+            frames_dir=str(frames),
+            fps=10,
+            subtitle_path=str(srt),
+            output_path=str(output),
+            media_assets_root=str(custom_root),
+        )
+        output.write_bytes(b"mp4")
+
+    assert len(captured_env) == 3
+    for env in captured_env:
+        assert env is not None
+        assert env["MEDIA_ASSETS_ROOT"] == str(custom_root)
+
+
+def test_compose_video_default_does_not_set_media_assets_root(tmp_path: Path) -> None:
+    frames = tmp_path / "frames"
+    srt = tmp_path / "out.srt"
+    output = tmp_path / "final.mp4"
+    ffmpeg = tmp_path / "ffmpeg.exe"
+    ffmpeg.write_bytes(b"ffmpeg")
+    _write_frame(frames)
+    _write_srt(srt)
+
+    captured_env: list[dict[str, str] | None] = []
+
+    def _capture_env(*args, **kwargs):
+        captured_env.append(kwargs.get("env"))
+        if len(captured_env) == 1:
+            return ffmpeg
+        if len(captured_env) == 2:
+            return None
+        return "background_music_missing"
+
+    with patch("screencast.composer.resolve_ffmpeg", side_effect=_capture_env), patch(
+        "screencast.composer.pick_background_music",
+        side_effect=_capture_env,
+    ), patch(
+        "screencast.composer.background_music_issue",
+        side_effect=_capture_env,
+    ), patch(
+        "screencast.composer._run_ffmpeg",
+        return_value=(True, ""),
+    ):
+        compose_video(
+            frames_dir=str(frames),
+            fps=10,
+            subtitle_path=str(srt),
+            output_path=str(output),
+        )
+
+    assert all(env is None for env in captured_env)
+
+
+def test_compose_video_media_assets_root_overrides_env(tmp_path: Path) -> None:
+    frames = tmp_path / "frames"
+    srt = tmp_path / "out.srt"
+    output = tmp_path / "final.mp4"
+    custom_root = tmp_path / "override-root"
+    custom_root.mkdir()
+    ffmpeg = custom_root / "ffmpeg.exe"
+    ffmpeg.write_bytes(b"ffmpeg")
+    _write_frame(frames)
+    _write_srt(srt)
+
+    original_env = {"MEDIA_ASSETS_ROOT": "/old/path", "OTHER": "keep"}
+    captured_env: list[dict[str, str] | None] = []
+
+    def _capture_env(*args, **kwargs):
+        captured_env.append(kwargs.get("env"))
+        if len(captured_env) == 1:
+            return ffmpeg
+        if len(captured_env) == 2:
+            return None
+        return "background_music_missing"
+
+    with patch("screencast.composer.resolve_ffmpeg", side_effect=_capture_env), patch(
+        "screencast.composer.pick_background_music",
+        side_effect=_capture_env,
+    ), patch(
+        "screencast.composer.background_music_issue",
+        side_effect=_capture_env,
+    ), patch(
+        "screencast.composer._run_ffmpeg",
+        return_value=(True, ""),
+    ):
+        compose_video(
+            frames_dir=str(frames),
+            fps=10,
+            subtitle_path=str(srt),
+            output_path=str(output),
+            media_assets_root=str(custom_root),
+            media_assets_env=original_env,
+        )
+        output.write_bytes(b"mp4")
+
+    assert original_env["MEDIA_ASSETS_ROOT"] == "/old/path"
+    assert captured_env[0]["MEDIA_ASSETS_ROOT"] == str(custom_root)
+    assert captured_env[0]["OTHER"] == "keep"

tests/test_screencast_runner.py

@@ -0,0 +1,78 @@
+# -*- coding: utf-8 -*-
+"""screencast runner 媒体资源参数传递测试。"""
+from __future__ import annotations
+
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from screencast.runner import run_screencast
+
+
+def test_run_screencast_passes_media_assets_root_to_compose_video(tmp_path: Path) -> None:
+    custom_root = tmp_path / "media-assets"
+    custom_root.mkdir()
+    captured: dict = {}
+
+    mock_recorder = MagicMock()
+    mock_recorder.frame_count = 1
+
+    def _fake_compose_video(**kwargs):
+        captured.update(kwargs)
+        Path(kwargs["output_path"]).write_bytes(b"mp4")
+        from screencast.composer import ComposeVideoResult
+
+        return ComposeVideoResult(kwargs["output_path"])
+
+    with patch("screencast.runner.activate_and_maximize_jiangchang_window", return_value=True), patch(
+        "screencast.runner.ScreenRecorder",
+        return_value=mock_recorder,
+    ), patch("screencast.runner.SubtitleEngine") as subtitle_cls, patch(
+        "screencast.runner.subprocess.Popen",
+    ) as popen_cls, patch(
+        "screencast.runner.compose_video",
+        side_effect=_fake_compose_video,
+    ):
+        subtitle = subtitle_cls.return_value
+        proc = popen_cls.return_value
+        proc.stdout = iter([])
+        proc.wait.return_value = 0
+
+        out = run_screencast(
+            skill_slug="demo-skill",
+            subtitle_script=[("ok", "done")],
+            pytest_args=["-q", "tests/test_demo.py"],
+            output_dir=str(tmp_path / "out"),
+            media_assets_root=str(custom_root),
+        )
+
+    assert Path(out).is_file()
+    assert captured.get("media_assets_root") == str(custom_root)
+
+
+def test_run_screencast_music_subdir_deprecated_warning() -> None:
+    with pytest.warns(DeprecationWarning, match="music_subdir is deprecated"):
+        with patch("screencast.runner.activate_and_maximize_jiangchang_window", return_value=False), patch(
+            "screencast.runner.ScreenRecorder",
+        ) as rec_cls, patch("screencast.runner.SubtitleEngine"), patch(
+            "screencast.runner.subprocess.Popen",
+        ) as popen_cls, patch(
+            "screencast.runner.compose_video",
+        ) as compose_mock:
+            rec = rec_cls.return_value
+            rec.frame_count = 0
+            proc = popen_cls.return_value
+            proc.stdout = iter([])
+            proc.wait.return_value = 0
+            from screencast.composer import ComposeVideoResult
+
+            compose_mock.return_value = ComposeVideoResult("out.mp4")
+
+            run_screencast(
+                skill_slug="demo",
+                subtitle_script=[],
+                pytest_args=["-q"],
+                output_dir=".",
+                music_subdir="calm",
+            )

tests/test_video_session.py

@@ -7,8 +7,8 @@ import os
 import sys
 import tempfile
 import unittest
+from pathlib import Path
 from unittest.mock import MagicMock, patch
-
 from jiangchang_skill_core import config
 from jiangchang_skill_core.rpa.video_session import RpaVideoSession
 
@@ -70,9 +70,10 @@ class TestRpaVideoSession(unittest.TestCase):
             config.reset_cache()
 
     @unittest.skipUnless(sys.platform == "win32", "gdigrab desktop capture")
-    @patch("jiangchang_skill_core.rpa.video_session.shutil.which", return_value="ffmpeg")
+    @patch("jiangchang_skill_core.rpa.video_session._resolve_ffmpeg_exe")
     @patch("jiangchang_skill_core.rpa.video_session.subprocess.Popen")
-    def test_enter_starts_ffmpeg_gdigrab(self, mock_popen: MagicMock, _which: MagicMock) -> None:
+    def test_enter_starts_ffmpeg_gdigrab(self, mock_popen: MagicMock, mock_resolve: MagicMock) -> None:
+        mock_resolve.return_value = Path(r"C:\media\bin\win32-x64\ffmpeg.exe")
         proc = MagicMock()
         proc.poll.return_value = None
         proc.stdin = MagicMock()
@@ -96,7 +97,7 @@ class TestRpaVideoSession(unittest.TestCase):
 
                 self.assertTrue(mock_popen.called)
                 cmd = mock_popen.call_args[0][0]
-                self.assertIn("ffmpeg", cmd)
+                self.assertTrue(str(cmd[0]).endswith("ffmpeg.exe"))
                 self.assertIn("gdigrab", cmd)
                 self.assertIn("desktop", cmd)
                 kwargs = mock_popen.call_args[1]
@@ -105,8 +106,8 @@ class TestRpaVideoSession(unittest.TestCase):
             os.environ.pop("OPENCLAW_RECORD_VIDEO", None)
             config.reset_cache()
 
-    @patch("jiangchang_skill_core.rpa.video_session.shutil.which", return_value=None)
-    def test_ffmpeg_not_found_warning(self, _which: MagicMock) -> None:
+    @patch("jiangchang_skill_core.rpa.video_session._resolve_ffmpeg_exe", return_value=None)
+    def test_ffmpeg_not_found_warning(self, _resolve: MagicMock) -> None:
         os.environ["OPENCLAW_RECORD_VIDEO"] = "1"
         try:
             with tempfile.TemporaryDirectory() as tmp: