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[Bug] RecorderManager在web端如果没有监听onFrameRecorded,stop的时候文件就是空白的 #281

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@yiescc
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const recorderManager = getRecorderManager();
recorderManager.onStart((e)=>{
  console.log('start',e)
})
recorderManager.onStop((e)=>{
  console.log('stop',e)
})
recorderManager.start({  
})
   setTimeout(() => {
       recorderManager.stop();
 }, 3000);

上面的代码输出的文件是空的

{
duration: 2000,
fileSize: 0,
tempFilePath: "blob:http://localhost:8989/7474aafc-53b1-4147-9158-44c4c228f156"}

但是如果加了

 recorderManager.onFrameRecorded((e)=>{
   console.log('onFrameRecorded',e)
 })

就正常

然后我们看到源文件https://github.com/raxjs/universal-api/blob/286d77035e/src/packages/media/recorder/src/web/index.ts#L114
这个确实是只有我们调用onFrameRecorded才会开始监听ondataavailable,才有切片

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