fix(unified-render): 无音轨视频防御 + probe_has_audio 工具
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- 新增 ffmpeg_utils.probe_has_audio:ffprobe 探测音频流 - _mix_audio 入口过滤无音频流的 clip,避免 FFmpeg 引用 [i:a] 失败 - 新增 _clip_has_audio 缓存方法,同 clip 只探测一次 - 6个新增单测覆盖:全无音频、部分无音频、主图层无但独立音轨有、缓存、双无音频兜底
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@@ -85,6 +85,41 @@ def run_ffmpeg(
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raise
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def probe_has_audio(local_path: str | Path) -> bool:
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"""探测文件是否包含音频流。
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Args:
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local_path: 本地文件路径
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Returns:
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True 表示有音频流(或探测失败保守返回),False 表示确认无音频流
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"""
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try:
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result = subprocess.run( # nosec B603
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[
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FFPROBE_BIN,
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"-v",
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"error",
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"-select_streams",
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"a:0",
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"-show_entries",
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"stream=codec_type",
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"-of",
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"default=noprint_wrappers=1:nokey=1",
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str(local_path),
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],
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check=True,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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text=True,
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timeout=10,
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)
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return result.stdout.strip() == "audio"
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except Exception:
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# 探测失败保守返回 True,让 FFmpeg 自己处理(避免误删音频)
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return True
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def probe_duration(local_path: str | Path) -> float:
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"""用 ffprobe 获取视频时长(秒)。
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