页面上放了一个按钮，调用startPicInPic，进入小窗模式失败，报错如下：

requestLivePlayerPictureInPicture:fail function cannot run on service

相关代码如下：

<live-player
  id="player"
  src="{{pullUrl}}" 
  mode="live" 
  autoplay 
  object-fit="fillCrop"
  bindstatechange="statechange"
  picture-in-picture-mode="{{['push']}}"
  bindenterpictureinpicture="enterPictureInPicture"
  bindleavepictureinpicture="leavePictureInPicture"
  catchtouchmove="{{true}}"
  bindtap="togglePureModel"
  style="width: 100%; height: 100%;">
</live-player>

this.setData({
  player: wx.createLivePlayerContext('player')
})

/**
 * 进入小窗模式
 */
startPicInPic () {
  this.data.player.requestPictureInPicture({
    success: res => {
      console.log('======================进入小窗成功======================')
      console.log(res)
    },
    fail: err => {
      console.log('======================进入小窗失败======================')
      console.log(err)
    }
  })
  wx.navigateBack()
},