Bilibili Audio

Bilibili Audio

Extract the ordinary complete audio track from a public Bilibili video. Default to MP3; use M4A/AAC when the user prefers the source audio without a second lossy conversion.

Workflow

1. Confirm the user supplied a Bilibili URL and requests the complete audio track. Do not infer permission for private, paid, login-required, region-locked, or otherwise restricted content.

2. Use scripts/extract_bilibili_audio.py. It queries only Bilibili's public playback information and does not use cookies or credentials.

3. Resolve scripts/extract_bilibili_audio.py relative to this SKILL.md. Default the output directory to downloads/bilibili within the active workspace. Run:

   python3 <skill-dir>/scripts/extract_bilibili_audio.py \
     '<URL>' --output-dir downloads/bilibili --format mp3
   

4. If FFmpeg is not installed, install a local, isolated FFmpeg provider only after approval, then re-run the command with its binary:

   python3 -m venv .codex-tools/bilibili-audio-venv
   .codex-tools/bilibili-audio-venv/bin/pip install imageio-ffmpeg
   

   Obtain the binary with python3 -c 'import imageio_ffmpeg; print(imageio_ffmpeg.get_ffmpeg_exe())' and pass it via --ffmpeg.

5. Report the generated local file as a clickable link. State the duration or source bitrate only if verified by the extraction output. Keep the downloaded MP3/M4A; the script removes its temporary .m4s stream after a successful conversion.

Options

• Add --format m4a to remux the original AAC audio when available, avoiding re-encoding.
• Add --bitrate 192k only when the user specifically wants a larger MP3. Increasing MP3 bitrate cannot improve the source audio.
• Add --ffmpeg /absolute/path/to/ffmpeg when the executable is not on PATH.

Boundaries

• Do not perform vocal, dialogue, or background-music separation; use a dedicated audio-separation workflow for that.
• Stop and explain if Bilibili does not expose an accessible public audio stream. Do not try cookies, account credentials, DRM workarounds, or restrictions bypasses.
• Handle the result as the user's local file; do not upload or redistribute it.