Bilibili AI Subtitle

Download Bilibili AI-generated subtitles (auto-subtitles) for videos. Use when you need to quickly get subtitles from Bilibili videos that have AI-generated...

Security Scan

The script and instructions match the declared purpose (download Bilibili AI subtitles), require only yt-dlp and common CLI tools, and do not contain unexplained network endpoints or credential exfiltration.

Purpose & Capability

The name/description (download Bilibili AI subtitles) align with the provided script and SKILL.md. The script uses yt-dlp to list and fetch AI subtitles, parses metadata, and writes a formatted TXT — all directly related to the stated purpose.

Instruction Scope

Runtime instructions and the script stay within subtitle-download scope. The script enumerates local browser cookie stores (WSL Chromium path and Windows Edge user data under /mnt/c/Users) to supply yt-dlp with cookies for member-only videos — this is relevant to the feature but does access local browser profile paths. No other files, external endpoints, or unrelated system data are accessed or transmitted.

Install Mechanism

There is no install step (instruction-only + shell script). No remote downloads or archive extraction are performed by the skill itself. The only declared dependency in SKILL.md is yt-dlp (the script also uses python3, coreutils like sed/grep/find/wc/date which are normal).

Credentials

The skill requests no environment variables or credentials. It does, however, attempt to read local browser cookie stores and enumerates /mnt/c/Users to locate a Windows Edge profile for cookie extraction — behavior that is explainable for accessing member-only videos but is sensitive because it uses authenticated browser cookies. Also the default output directory is a hardcoded path (/home/administrator/.openclaw/workspace/...) if none is provided, which may be surprising; supplying an explicit output directory is advisable.

Persistence & Privilege

The skill does not request permanent presence (always: false) and does not modify other skills or global agent config. It runs only when invoked.

Assessment

This skill appears coherent for its stated purpose. Before installing/running: 1) Ensure yt-dlp and python3 are installed and up-to-date. 2) Review the script yourself (it is short and readable). 3) Be aware it will try to read local browser cookie stores (WSL Chromium path or Windows Edge user data under /mnt/c/Users) to access member-only videos — if you don't want that, run the script without cookies or remove the cookie-detection block. 4) Provide an explicit output directory when invoking to avoid the hardcoded /home/administrator path. 5) Run in a sandbox or test environment if you are unsure about giving the script access to browser profile directories.

Bilibili AI Subtitle Downloader v2.0

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:

• ✅ Customizable language priority (e.g., prefer English over Chinese)
• ✅ Better filename format: Title_Author_Date_Duration_BVid.txt
• ✅ Three-part document structure (Info, Summary, Full Text)
• ✅ Improved UTF-8 filename handling
• ✅ 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:

• WSL Chromium (preferred): chromium-browser &
• Windows Edge: Log in normally

The script will automatically detect and use available cookies.

Requirements

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

Notes

• AI subtitles are generated automatically by Bilibili's system
• Accuracy varies (typically 85-95% for clear speech)
• Not all videos have AI subtitles available
• 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).