fix: auto-fallback to visual description for videos without audio#12
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Videos from X/Twitter sometimes have no audio stream, causing ffmpeg to crash with "Output file does not contain any stream" during audio extraction. Detect audio presence in metadata and auto-switch to visual description mode when no audio is found. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
…allback # Conflicts: # src/bilingualsub/core/downloader.py
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Summary
has_audio偵測（yt-dlp info dict + ffprobe 兩條路徑）Test plan
uv run pytest tests/unit -m unit)🤖 Generated with Claude Code