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Process audio/video data in the browser using WebCodecs. 基于 WebCodecs 在浏览器中处理音视频数据。

License: MIT License

JavaScript 0.64% TypeScript 96.10% HTML 3.26%

webav's Introduction

WebAV

An audio/video toolkit built with pure web technologies, planned to include creation, editing, and exporting capabilities, applicable to products like live streaming, tutorial recording, video clipping, etc.

使用纯Web技术构建的音视频工具,计划包含创建、编辑、导出功能,可应用于直播、教程录制、视频剪辑等产品中。

Motivation

Chrome 94 released the WebCodecs API, meaning JS can now handle audio/video as well. Before this, frontend developers could only use ffmpeg.js in limited scenarios. Through simple tests of decoding and re-encoding videos, it was found WebCodecs has 20x the performance of ffmpeg.js.

Chrome 94 开放了 WebCodecs API,意味着 JS 也能处理音视频了。在此之前,前端开发在会在有限的场景使用 ffmpeg.js,经过简单地测试解码和重编码视频发现,WebCodecs 性能是 ffmpeg.js 的 20 倍。

This is an experimental project attempting to provide easy-to-use APIs for handling audio/video data in the browser. The project is under active development, feel free to open issues to report bugs or suggest new features.

这是一个实验性项目,尝试提供简单易用的 API 在浏览器中处理音视频数据。项目正在积极迭代,可提交 issue 来反馈 Bug 和新功能建议。

Packages

  • AVCliper
    Audio/Video Clipping Toolkit.
    音视频剪辑工具库。
  • AVCanvas
    Combine Text, Image, Video, Audio, UserMedia, DisplayMedia to generate MediaStream.
    使用文字、图片、音视频文件、摄像头&麦克风、分享屏幕来生成 MediaStream。
  • AVRecorder
    Record MediaStream, export MP4 stream.
    录制 MediaStream,导出 MP4 流。

Features

  • Audio/Video Clipper AVCliper

    • Combine mp4, mp3, images, text by timeline
    • Embed SRT subtitles
    • Video muting, audio mixing, volume control, audio looping, audio resampling
    • Video frame by frame processing, built-in chroma key
    • Animation properties: x, y, w, h, opacity, angle
  • Canvas AVCanvas

    • Move, rotate, flip, scale to fit, warp
    • Media sources: camera, microphone, screen sharing
    • Resource types: video, audio, image, text
  • Recorder AVRecorder

    • Record video from MediaStream, AVCanvas, export to MP4
  • 音视频剪辑 AVCliper

    • mp4、mp3、图片、文字 按时间线合成
    • 嵌入 SRT 字幕
    • 视频消音、音频混流、音量控制、音频循环、音频重采样
    • 视频逐帧处理,内置 绿幕抠图
    • 动画属性:x, y, w, h, opacity, angle
  • 画布 AVCanvas

    • 移动、旋转、翻转、等比缩放、变形
    • 媒体来源:摄像头、麦克风、分享屏幕
    • 资源类型:视频、音频、图片、文字
  • 录制 AVRecorder

    • 从 MediaStream、AVCanvas 中录制视频,导出 MP4

DEMO

Development

This repo uses lerna + yarn to manage packages.

  1. Install dependencies: Run yarn install in root directory
  2. Build all packages: Run yarn build in root directory
  3. Run DEMO
    1. cd into specific package, e.g. cd packages/av-cliper
    2. Run yarn dev
  4. Access DEMO in browser
    1. Copy baseUrl printed in console, e.g. http://localhost:6066/
    2. Locate DEMO path, it's filename in packages/av-cliper/demo dir, like concat-media.html
    3. Open final URL in browser: http://localhost:6066/concat-media.html

当前仓库是使用 lerna + yarn 管理 packages。

  1. 安装依赖:在根目录执行 yarn install
  2. 构建所有 packages:在根目录执行 yarn build
  3. 运行 DEMO
    1. cd 到特定的 package 目录,比如 cd packages/av-cliper
    2. 执行 yarn dev
  4. 访问 DEMO
    1. 复制控制台中打印的 baseUrl,类似 http://localhost:6066/
    2. 确定对应 DEMO 的 path,是 packages/av-cliper/demo 目录下的文件名,如 concat-media.html
    3. 在浏览器打开最终 URL:http://localhost:6066/concat-media.html

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Web 音视频系列文章

Plan

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Contributors

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