Bilibili AI Subtitle

Download AI-generated subtitles from Bilibili videos quickly.

What This Skill Does

This skill downloads AI-generated subtitles (自动生成的字幕) from Bilibili videos. These are subtitles automatically created by Bilibili's AI system, not manually uploaded by creators.

Key improvements from v1.x:

1. ✅ Customizable language priority (e.g., prefer English over Chinese)
2. ✅ Better filename format: Title_Author_Date_Duration_BVid.txt
3. ✅ Three-part document structure (Info, Summary, Full Text)
4. ✅ Improved UTF-8 filename handling
5. ✅ Better WSL Chromium/Windows Edge Cookie support

Supported AI Languages

Bilibili uses ai- prefix for AI-generated subtitles:

| Code | Language | 语言 | |------|----------|------| | ai-zh | Chinese | 中文 | | ai-en | English | 英文 | | ai-ja | Japanese | 日文 | | ai-es | Spanish | 西班牙文 | | ai-ar | Arabic | 阿拉伯文 | | ai-pt | Portuguese | 葡萄牙文 | | ai-ko | Korean | 韩文 | | ai-de | German | 德文 | | ai-fr | French | 法文 |

Usage

Basic Usage

./scripts/bilibili_ai_subtitle.sh "https://www.bilibili.com/video/BVxxxxx/"

Specify Language Priority

# Prefer English, fallback to Chinese
./scripts/bilibili_ai_subtitle.sh -l en,zh "BVxxxxx"

# Prefer Japanese
./scripts/bilibili_ai_subtitle.sh --lang ja "BVxxxxx"

# Multiple languages in order of preference
./scripts/bilibili_ai_subtitle.sh -l en,zh,ja,es "BVxxxxx"

Output

File name format: VideoTitle_Author_Date_Duration_BVid.txt

File structure:

第一部分：视频信息
├── 视频标题
├── B站链接
├── 作者
├── 发布时间
├── 视频时长
├── 原视频语言
└── 转录来源

第二部分：视频摘要
└── 自动生成的内容摘要

第三部分：完整原文
└── 完整字幕文本

Setup

Browser Cookie (Recommended)

For accessing member-only videos, log in to Bilibili in:

1. WSL Chromium (preferred): chromium-browser &
2. Windows Edge: Log in normally

The script will automatically detect and use available cookies.

Requirements

1. yt-dlp installed
2. Optional: Browser with Bilibili login (for member-only videos)

Notes

1. AI subtitles are generated automatically by Bilibili's system
2. Accuracy varies (typically 85-95% for clear speech)
3. Not all videos have AI subtitles available
4. Some videos may require membership to access AI subtitles

Comparison with bilibili-transcript

| Feature | bilibili-ai-subtitle | bilibili-transcript | |---------|---------------------|---------------------| | Purpose | Download AI subtitles only | Full transcription workflow | | Speed | ⚡ Fast (instant download) | Varies (subtitles → Whisper) | | Subtitle sources | AI only | CC → AI → Whisper | | Use case | Quick subtitle grab | Complete transcription | | Dependencies | yt-dlp only | yt-dlp + optional Whisper |

Recommendation: Use bilibili-ai-subtitle for quick AI subtitle download, use bilibili-transcript when you need complete transcription (including voice transcription for videos without subtitles).