8: The remote audio-and-video stream falls back to the audio-only stream due to poor network conditions.
9: The remote audio-only stream switches back to the audio-and-video stream after the network conditions improve.
0: The SDK reports this reason when the video state changes.
3: The local user stops receiving the remote video stream or disables the video module.
4: The local user resumes receiving the remote video stream or enables the video module.
1: Network congestion.
2: Network recovery.
5: The remote user stops sending the video stream or disables the video module.
7: The remote user leaves the channel.
6: The remote user resumes sending the video stream or enables the video module.