programmerloverun/bilibili-to-doc/bilibili-to-doc

Bilibili Video to Document (B站视频提取文档)

Overview

Extract Bilibili video content into a structured Markdown document by: (1) downloading AI-generated subtitles via yt-dlp with browser cookies, (2) parsing the SRT subtitle file, (3) reorganizing the transcript into a logical, well-structured document with sections, tables, and code blocks.

When to Use

Trigger this skill when the user:

• Provides a bilibili.com video URL and asks to extract/converter it to a document
• "提取B站视频内容" / "B站视频转文档" / "将视频转成文章"
• "把这个B站视频整理成笔记"
• "generate document from Bilibili video"

Prerequisites

• yt-dlp must be installed: pip3 install yt-dlp
• Browser cookies are needed for Bilibili access (Chrome or other browser)
• Python 3.10+ for subtitle processing

Workflow

Step 1: Download Subtitles

Use yt-dlp with browser cookies to download the AI Chinese subtitles:

yt-dlp --cookies-from-browser chrome "<BILIBILI_URL>" \
  --write-subs --sub-lang ai-zh \
  --skip-download \
  -o "/tmp/bilibili_output"

Also get the video title:

yt-dlp --cookies-from-browser chrome "<BILIBILI_URL>" \
  --print "%(title)s" --skip-download 2>&1 | tail -1

If chrome browser cookies are not available, try safari, firefox, or edge.

Step 2: Parse SRT and Generate Document

Read the downloaded .ai-zh.srt file, then:

1. Strip SRT formatting: Remove sequence numbers, timestamps, empty lines
2. Merge consecutive lines: Combine fragmented subtitle lines into complete sentences
3. Identify logical sections: The AI should read through the full transcript and identify:

• Topic/theme divisions
• Step-by-step procedures
• Key concepts and definitions
• Configuration examples / code blocks

1. Structure the document with proper heading hierarchy

Step 3: Document Structure

Generate a Markdown document following this structure (from reference template):

# {Video Title}
 
> 来源：B站视频 {BV号} | 主讲：{author}
 
---
 
## 一、{Topic Overview}
 
{Summary of what the video covers}
 
## 二、{Main Content Sections}
 
{Organized by logical topic divisions}
 
## N、总结
 
{Key takeaways}

Step 4: Save Output

Save to the user's Desktop by default: ~/Desktop/{Video_Title}.md

Document Writing Guidelines

• Preserve technical details: Configuration code, SQL, JSON, YAML, shell commands should be formatted in code blocks
• Use tables for comparisons: Feature comparisons, parameter lists, pros/cons
• Bullet lists for key points: Use hierarchical bullet points for nested concepts
• Add section numbers: Use Chinese numbered sections (一、二、三...) for main divisions
• Keep code accurate: If the speaker mentions specific config/code, represent it faithfully
• Add explanatory notes: Fill in gaps where the spoken word might be ambiguous without visuals
• Trim filler content: Remove repeated phrases, verbal fillers (嗯, 啊, 这个), and self-promotion segments
• Mark at the end: Add a disclaimer that the document is AI-generated from subtitles

Reference

See references/doc-template.md for the full document template.