- In chrome browser, I am using MacBook to record a 30 minutes class, in code, use getDisplayMedia to get the screen stream：
navigator.mediaDevices.getDisplayMedia({audio:true,video:true}).then((mediaStream)=>{
mediaRecorder = new MediaRecorder(mediaStream,{mineType:'video/webm'})
})
2.When the recording started 5 minutes later, I connected an external microphone to the MacBook, then lectured through the microphone, and then hoped that my voice would be recorded through the microphone, but the strange thing is that since the microphone is connected, there is no recording screen behind The sound is down, what’s the matter, how can I operate so that I can continue recording when switching microphones?
