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B2A

让 AI Agent(Claude Code、Codex、Cursor、Antigravity、Windsurf 等)原生具备“观看”和“倾听”B站视频能力的多模态 MCP 插件。

B2A 不是一个爬虫工具——它赋予 AI 真正理解视频内容的能力。AI 会像人一样先"读"字幕,看不懂就"看"画面,听不到就"听"声音,最终用自己的理解回答你的问题。

它是怎么工作的

当你把一个 B 站链接丢给 AI 时,它会自主决定用哪种方式来理解视频:

  • 读字幕(毫秒级):最快的方式,直接读取视频自带的 CC 字幕。
  • 看画面(1-3分钟):如果没有字幕,AI 会征得你同意后去"观看"视频——以低分辨率快速浏览全片画面,像人一样先看全局再聚焦细节。
  • 听声音(30秒-几分钟):AI 也可以去"听"视频里的人声并转成文字。它会提前告诉你:它的"听力"是语音识别,只能听懂人说的话,纯音乐和音效听不出来。
  • 自动清理:分析结束后,AI 会自动清除所有临时文件,不占用你的磁盘空间。

所有耗时操作都会先征得你的同意,并在开始前给你一句等待提示,不会突然静默几分钟。

安装

1. 安装 FFmpeg(前置依赖)

画面分析和音频处理需要 FFmpeg。如果忘记装,AI 会在聊天里提示你怎么装:

  • Windows: winget install Gyan.FFmpeg(安装后需重启终端)
  • macOS: brew install ffmpeg
  • Linux: apt install ffmpeg

2. 安装 B2A

pip install b2a777

MCP 接入指南

安装完成后,根据你使用的客户端选择对应的配置方式:

Claude Code / Codex / Antigravity

在对话框中输入:

/mcp add b2a-vision b2a-mcp

Cursor

  1. 打开 Cursor Settings -> Features -> MCP
  2. 点击 + Add New MCP Server
  3. Type: command
  4. Name: b2a-vision
  5. Command: b2a-mcp

Windsurf

在 mcp_config.json 中添加:

{
  "mcpServers": {
    "b2a-vision": {
      "command": "b2a-mcp",
      "args": []
    }
  }
}

Claude Desktop

在 claude_desktop_config.json 中添加:

{
  "mcpServers": {
    "b2a-vision": {
      "command": "b2a-mcp",
      "args": []
    }
  }
}

使用示例

配置好 MCP 后,直接用自然语言和 AI 对话即可:

  • "帮我看看这个视频讲了什么:BV1xx411c7mD" — AI 读取字幕后直接回答
  • "这个视频没字幕,帮我了解一下内容" — AI 会问你:"我可以看一下视频画面吗?" 或 "我可以试着听一下吗?",等你同意后才开始
  • "帮我看看 5分钟到 5分30秒 那段 PPT 写了什么" — AI 会下钻到指定时间段,以更高清晰度仔细查看
  • "你看看这个视频,我想跟你聊聊..." — AI 会尝试分析视频的内容并产生理解

AI 会根据视频内容自主判断最合适的理解方式,整个过程像和一个助手对话一样自然。

语音识别配置(可选)

如果需要"听"视频里的人声内容,B2A 接入了火山引擎(豆包)语音识别。配置方式极其简单:

  1. 前往火山引擎控制台申请 API Key
  2. 当 AI 提示需要 Key 时,直接把 Key 粘贴进聊天框
  3. AI 会自动将 Key 安全地存储到 ~/.b2a/.env(你的用户主目录下)

API Key 存储位置:~/.b2a/.env(Windows: C:\Users\<用户名>\.b2a\.env)

CLI 工具

B2A 也可以作为命令行工具独立使用:

# 获取视频信息与字幕
b2a BV1xx411c7mD

# 语音识别(需配置 API Key)
b2a BV1xx411c7mD --asr

# 视觉抽帧
b2a BV1xx411c7mD --visual

# 指定时间段
b2a BV1xx411c7mD --asr --start 01:30 --end 02:40

# JSON 结构化输出
b2a BV1xx411c7mD --format json

# 指定分P
b2a BV1xx411c7mD --page 2

License

MIT

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