StreamFallbackOptions
Options for handling audio and video stream fallback when network conditions are weak.
Enumerator
- STREAM_FALLBACK_OPTION_DISABLED
 - 0: No fallback processing is performed on audio and video streams, the quality of the audio and video streams cannot be guaranteed.
 - STREAM_FALLBACK_OPTION_VIDEO_STREAM_LOW
 - 1: Only receive low-quality (low resolution, low bitrate) video stream.
 - STREAM_FALLBACK_OPTION_AUDIO_ONLY
 - 2: When the network conditions are weak, try to receive the low-quality video stream first. If the video cannot be displayed due to extremely weak network environment, then fall back to receiving audio-only stream.