Bilibili Subtitle Skill

Extract Bilibili subtitles with BBDown and render transcript outputs.

When To Use

Use this skill when a Bilibili video already has downloadable subtitles, including Bilibili AI subtitles exposed by BBDown. This skill only extracts subtitle files exposed by BBDown.

Commands

| Task | Command | | --- | --- | | Preflight | pixi run python -m bilibili_subtitle --check | | JSON preflight | pixi run python -m bilibili_subtitle --check-json | | Extract | pixi run python -m bilibili_subtitle "URL" -o ./output | | Extract JSON | pixi run python -m bilibili_subtitle "URL" -o ./output --json-output | | Select language | pixi run python -m bilibili_subtitle "URL" --language zh-Hans -o ./output |

Workflow

Parse the Bilibili URL, BV ID, or av ID.
Run BBDown in subtitle-only mode.
Load the downloaded subtitle file.
Render Markdown transcript, SRT, and VTT files.
Optionally emit JSON for parent skills.

Outputs

output/
├── {title}.transcript.md
├── {title}.srt
└── {title}.vtt

JSON Contract

pixi run python -m bilibili_subtitle "URL"   -o /tmp/output   --json-output

The response includes exit_code, output.files, warnings, and errors.

Dependencies

pixi for the Python environment
BBDown for subtitle extraction
gh for installer-driven BBDown nightly downloads

Error Handling

| Code | Level | Meaning | Remediation | | --- | --- | --- | --- | | E001 | FATAL | BBDown missing | Run ./install.sh | | E002 | FATAL | BBDown auth required | Run BBDown login | | E003 | RECOVERABLE | Download failed | Check URL/network/login/language | | E004 | RECOVERABLE | No downloadable subtitles | Try another language or video | | E005 | FATAL | Invalid URL/ID | Provide a Bilibili URL, BV ID, or av ID | | E006 | FATAL | Output write failed | Check output directory permissions | | E007 | RECOVERABLE | Invalid subtitle content | Retry or inspect BBDown output |