wxml：

<view class="container" id="aaa">

  adfasdfasdf

  <button bindtap="startVideo">录制</button>

</view>

js：

startVideo(){

    let query = wx.createSelectorQuery()

    let el = query.select("#aaa")

    let video = wx.createMediaRecorder(el,{duration: 7200})

    video.on('stop',function (e){

      console.log(e)

    })

    video.on('start',function (){

      console.log('aaaaaaaaaaaaa')

    })

    video.start()

    console.log(video)

    setTimeout(() => {

      video.stop()

    },5000)

  }

})

start的回调没问题 stop的回调报错code:601