Bilibili Transcript v2.0

High-accuracy Bilibili video transcription with multi-language AI subtitle support.

Overview

This skill provides a complete transcription workflow for Bilibili videos:

1. Extract Video Metadata - Title, author, publish date, duration
2. Smart Subtitle Detection - Priority: CC subtitles → AI subtitles (multi-language) → Whisper transcription
3. Multi-language AI Subtitle Support - Auto-detects: ai-zh, ai-en, ai-ja, ai-es, ai-ar, ai-pt, ai-ko, ai-de, ai-fr
4. Browser Cookie Support - WSL Chromium or Windows Edge for member-only videos
5. Formatted Output - Saves as structured TXT file with metadata + summary placeholder + full transcript
6. Simplified Chinese - Automatically converts Traditional to Simplified Chinese

What's New in v2.0

• ✅ Multi-language AI subtitles - Supports 9 languages: Chinese, English, Japanese, Spanish, Arabic, Portuguese, Korean, German, French
• ✅ WSL Chromium support - Better cookie extraction than Windows Edge
• ✅ Correct subtitle download - Uses --write-subs --write-auto-subs combo
• ✅ Language auto-detection - Automatically finds available AI subtitle language

AI Subtitle Language Codes

Bilibili uses ai- prefix for AI-generated subtitles:

Requirements

Hardware (Your Setup)

• GPU: NVIDIA RTX 4070 Super (12GB VRAM) - ✅ Perfect for medium model
• WSL Memory: 16GB (configured)
• WSL CPU: 6 cores (configured)

Software

• yt-dlp - Video/audio download
• ffmpeg - Audio processing
• whisper - Speech-to-text (local, no API key)
• opencc - Traditional to Simplified Chinese conversion (optional)

Browser (for AI subtitles)

• WSL Chromium (recommended) - Log in to Bilibili in WSL
• Windows Edge - Alternative option

Workflow

Step 1: Run Transcription Script

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

Priority order:

1. CC Subtitles (manual) - Fastest, highest accuracy
2. AI Subtitles (auto-generated) - Fast, good accuracy, multi-language
3. Whisper Transcription - Slowest, ~95% accuracy, works for all videos

Step 2: Generate Detailed Summary

After the script completes, read the generated TXT file and:

1. Read the full transcript (第二部分)
2. Generate a comprehensive summary (第一部分)
3. Save the updated file

Step 3: Present to User

In Discord, post:

• Brief summary in message
• Attach the TXT file for full content

Setup WSL Chromium Login

For best results with AI subtitles:

1. Start WSL Chromium:

   chromium-browser &
   

2. Navigate to bilibili.com

3. Log in with your Bilibili account

4. Run the transcription script

The script will automatically use Chromium's cookies to access member-only AI subtitles.

Usage Examples

Example 1: Basic Transcription (Default Output)

./scripts/bilibili_transcript.sh "https://www.bilibili.com/video/BV1Z1wJzgEAj/"
# Output: workspace/Bilibili transcript/[VideoTitle]_BVxxxxx_transcript.txt

Example 2: Custom Output Directory

./scripts/bilibili_transcript.sh "https://www.bilibili.com/video/BV1Z1wJzgEAj/" ~/Documents

Notes

Model Selection

• Your config: RTX 4070 Super 12GB + 16GB RAM + 6 cores
• Default: medium model (~95% accuracy, balanced speed) ✅
• Fallback: If GPU unavailable, automatically uses CPU (slower)

Accuracy Comparison

Default Output Directory

• Location: workspace/Bilibili transcript/
• Created automatically on first run
• All transcript files organized in one place

File Naming

Output files are named: [VideoTitle]_[BVID]_transcript.txt

• Special characters (including Chinese punctuation) are replaced with underscores
• Title truncated to 50 characters
• Example: 股票分红_是从左口袋掏右口袋吗_BV1ddzUYTE27_transcript.txt

Subtitle Priority

The script tries subtitles in this order:

1. Manual CC subtitles (zh-CN, zh-TW, en, ja, etc.)
2. AI subtitles (any available language: ai-zh, ai-en, ai-ja, etc.)
3. Whisper voice transcription (fallback)

This ensures fastest processing while maintaining high accuracy.