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Local broadcast MSE fragments mp4 service

2022-08-02 19:33:00 【Technical Notes from HUI】

To test the browserMSE的多媒体框架,搭建一个MSEService will be much more convenient,这里记录下fragment mp4服务的搭建过程.

生成fragment mp4

下载安装bento4

Bento4是一个C++类库和工具,用于读取和写入ISO-MP4文件.除了支持ISO-MP4外,Bento4Parsing and reuse are also supportedH.264和H.265 ES流,将ISO-MP4转换为MPEG2-TS,打包HLS和MPEG-DASH、CMAF、内容加密、解密等.

# http://zebulon.bok.net/Bento4/binaries/

wget http://zebulon.bok.net/Bento4/binaries/Bento4-SDK-1-6-0-639.x86_64-unknown-linux.zip
unzip Bento4-SDK-1-6-0-639.x86_64-unknown-linux.zip

cd Bento4-SDK-1-6-0-639.x86_64-unknown-linux/

# 直接放到/usr目录下
sudo cp * /usr/. -rf

输入mp4,tab键补全,可以看到,可用的binarycan be found：

$ mp4
mp42aac         mp42hevc        mp42ts          mp4dash         mp4dcfpackager
mp4dump         mp4encrypt      mp4fragment     mp4iframeindex  mp4mux          
mp4split        mp42avc         mp42hls         mp4compact      mp4dashclone 
mp4decrypt      mp4edit         mp4extract      mp4hls          mp4info 
mp4rtphintinfo  mp4tag

转换mp4为fragment mp4

使用mp4fragment,将普通mp4转换为fragment mp4,不指定--fragment-duration,生成的fragment duration按default值:

$ mp4fragment video.mp4  fragmented-default.mp4 
found regular I-frame interval: 1511 frames (at 29.970 frames per second)
auto-detected fragment duration too large, using default

指定fragment时长为2s：

mp4fragment --fragment-duration 2000 video.mp4 fragmented.mp4

通过mp4info查看生成的fragmented.mp4文件信息,这时候fragments字段已经变成yes：

$ mp4info fragmented.mp4 
File:
  major brand:      isom
  minor version:    200
  compatible brand: isom
  compatible brand: iso2
  compatible brand: avc1
  compatible brand: mp41
  compatible brand: iso5
  fast start:       yes

Movie:
  duration:   97903 (media timescale units)
  duration:   97903 (ms)
  time scale: 1000
  fragments:  yes

fragment mp4分片

对fragment mp4进行分片:

$ mp4dash fragmented.mp4 
Parsing media file 1: fragmented.mp4
WARNING: video segment durations for "File 1#1" vary by more than 10% (consider using --use-segment-timeline)
Splitting media file (video) fragmented.mp4

分片完成后,没有指定output-dir参数,会生成output目录：

$ cd output/video/avc1
$ ls
init.mp4    seg-11.m4s  seg-13.m4s  seg-15.m4s  seg-17.m4s  seg-19.m4s 
seg-20.m4s  seg-22.m4s  seg-3.m4s  seg-5.m4s  seg-7.m4s  seg-9.m4s
seg-10.m4s  seg-12.m4s  seg-14.m4s  seg-16.m4s  seg-18.m4s  seg-1.m4s
seg-21.m4s  seg-2.m4s   seg-4.m4s  seg-6.m4s  seg-8.m4s

配置mse-demo

新建4k.html文件,修改baseUrl,templateUrl字段,放到nginx服务的目录下：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>MSE Demo</title>
</head>
<body>
  <h1>MSE Demo</h1>
  <div>
    <video controls width="80%"></video>
  </div>

  <script type="text/javascript"> (function() {
       var baseUrl = 'http://192.168.31.124/dash/output/video/avc1/'; var initUrl = baseUrl + 'init.mp4'; var templateUrl = baseUrl + 'seg-$Number$.m4s'; var sourceBuffer; var index = 1; var numberOfChunks = 22; var video = document.querySelector('video'); if (!window.MediaSource) {
       console.error('No Media Source API available'); return; } var ms = new MediaSource(); video.src = window.URL.createObjectURL(ms); ms.addEventListener('sourceopen', onMediaSourceOpen); function onMediaSourceOpen() {
       sourceBuffer = ms.addSourceBuffer('video/mp4; codecs="avc1.4d401f"'); sourceBuffer.addEventListener('updateend', nextSegment); GET(initUrl, appendToBuffer); video.play(); } function nextSegment() {
       var url = templateUrl.replace('$Number$', index); GET(url, appendToBuffer); index++; if (index > numberOfChunks) {
       sourceBuffer.removeEventListener('updateend', nextSegment); } } function appendToBuffer(videoChunk) {
       if (videoChunk) {
       sourceBuffer.appendBuffer(new Uint8Array(videoChunk)); } } function GET(url, callback) {
       var xhr = new XMLHttpRequest(); xhr.open('GET', url); xhr.responseType = 'arraybuffer'; xhr.onload = function(e) {
       if (xhr.status != 200) {
       console.warn('Unexpected status code ' + xhr.status + ' for ' + url); return false; } callback(xhr.response); }; xhr.send(); } })(); </script>
</body>
</html>

播放测试

$ google-chrome http://192.168.31.124/mse-demo/4k.html

https://github.com/hongszh/mse-demo

原网站

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