Release v1.0.10: shared media_assets and screencast media_assets_root override

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

README.md

@@ -94,7 +94,27 @@ send_prompt_via_composer(page, "第一行\n第二行")
 
 可通过环境变量覆盖：
 
-`MEDIA_ASSETS_ROOT=D:\OpenClaw\client-commons\media-assets`
+`MEDIA_ASSETS_ROOT=/path/to/custom/media-assets`
+
+### 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）
 

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "jiangchang-platform-kit"
-version = "1.0.9"
+version = "1.0.10"
 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_skill_core/__init__.py

@@ -23,8 +23,11 @@ from .unified_logging import (
 )
 from .media_assets import (
     MediaAssetsStatus,
+    background_music_issue,
     ensure_media_assets,
     pick_background_music,
+    probe_ffmpeg,
+    probe_media_assets,
     resolve_ffmpeg,
     resolve_ffprobe,
     resolve_media_assets_root,
@@ -43,7 +46,10 @@ __all__ = [
     "EntitlementResult",
     "EntitlementServiceError",
     "MediaAssetsStatus",
+    "background_music_issue",
     "ensure_media_assets",
+    "probe_ffmpeg",
+    "probe_media_assets",
     "pick_background_music",
     "resolve_ffmpeg",
     "resolve_ffprobe",

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

@@ -27,6 +27,67 @@ _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 = 128
+
+
+def _is_git_lfs_pointer(path: Path) -> bool:
+    try:
+        head = path.read_bytes()[:256]
+    except OSError:
+        return False
+    return head.startswith(_GIT_LFS_POINTER_PREFIX)
+
+
+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: Path) -> bool:
+    if not path.is_file():
+        return False
+    if path.suffix.lower() not in _AUDIO_EXTENSIONS:
+        return False
+    if _is_git_lfs_pointer(path):
+        return False
+    try:
+        if path.stat().st_size < _MIN_AUDIO_BYTES:
+            return False
+    except OSError:
+        return False
+    return True
 
 
 @dataclass
@@ -39,6 +100,7 @@ class MediaAssetsStatus:
     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
 
@@ -275,6 +337,13 @@ def _inspect_media_assets(root: Path, *, source: str) -> MediaAssetsStatus:
     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
@@ -282,6 +351,7 @@ def _inspect_media_assets(root: Path, *, source: str) -> MediaAssetsStatus:
         and watermark_exists
         and ffmpeg_exists
         and ffprobe_exists
+        and music_ready
     )
 
     return MediaAssetsStatus(
@@ -293,6 +363,7 @@ def _inspect_media_assets(root: Path, *, source: str) -> MediaAssetsStatus:
         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,
     )
@@ -487,10 +558,43 @@ def _needs_media_repo_content(status: MediaAssetsStatus) -> bool:
             "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) -> MediaAssetsStatus:
+    if not _needs_music_content_repair(status):
+        return status
+    if _media_assets_root_overridden(None):
+        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):
+        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,
@@ -529,25 +633,53 @@ def ensure_media_assets(
 
     if _try_download_via_zip(shared, root, warnings):
         return _maybe_ensure_ffmpeg_tools(
+            root,
+            _maybe_repair_music_content(
                 root,
                 _inspect_media_assets(root, source="zip"),
+            ),
         )
 
     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",
                 ),
+            ),
         )
 
     final = _inspect_media_assets(root, source="local")
     for warning in warnings:
         if warning not in final.warnings:
             final.warnings.append(warning)
-    return _maybe_ensure_ffmpeg_tools(root, final)
+    repaired = _maybe_repair_music_content(root, final)
+    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(
@@ -574,6 +706,18 @@ def resolve_music_dir(
     return status.music_dir
 
 
+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,
@@ -583,10 +727,11 @@ def pick_background_music(
     if music_dir is None or not music_dir.is_dir():
         return None
 
-    candidates: list[Path] = []
-    for path in music_dir.rglob("*"):
-        if path.is_file() and path.suffix.lower() in _AUDIO_EXTENSIONS:
-            candidates.append(path)
+    candidates = [
+        path
+        for path in music_dir.rglob("*")
+        if _is_usable_audio_file(path)
+    ]
 
     if not candidates:
         return None

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_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

@@ -15,6 +15,7 @@ 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" * 256)
     (root / "fonts").mkdir(parents=True)
     (root / "watermark").mkdir(parents=True)
     bin_key = ma._platform_bin_key()
@@ -117,9 +118,9 @@ def test_pick_background_music_stable_first(tmp_path: Path, monkeypatch: pytest.
     root = tmp_path / "data" / "shared" / "media-assets"
     _make_complete_assets(root)
     music = root / "music"
-    (music / "b-upbeat.mp3").write_bytes(b"mp3")
-    (music / "calm" / "a-calm.mp3").write_bytes(b"mp3")
-    (music / "z-last.wav").write_bytes(b"wav")
+    (music / "b-upbeat.mp3").write_bytes(b"x" * 256)
+    (music / "calm" / "a-calm.mp3").write_bytes(b"x" * 256)
+    (music / "z-last.wav").write_bytes(b"x" * 256)
 
     monkeypatch.setattr(
         ma,
@@ -136,7 +137,7 @@ def _build_archive_zip(dest: Path, inner_name: str) -> None:
     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/.keep", "")
+        zf.writestr(f"{inner_name}/music/calm/track.mp3", b"x" * 256)
         zf.writestr(f"{inner_name}/fonts/.keep", "")
         zf.writestr(f"{inner_name}/watermark/.keep", "")
 
@@ -213,9 +214,117 @@ def test_windows_default_data_root() -> None:
     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_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" * 256)
+    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").mkdir(parents=True)
+    (root / "music" / "calm").mkdir(parents=True)
+    (root / "music" / "calm" / "track.mp3").write_bytes(b"x" * 256)
     (root / "fonts").mkdir(parents=True)
     (root / "watermark").mkdir(parents=True)
     (root / "manifest.json").write_text(

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: