Occurs each time the SDK receives a video frame and prompts you whether or not to mirror the captured video.
If the video data you want to obtain is a mirror image of the original video, you need to register this callback when calling RegisterVideoFrameObserver. After you successfully register the video frame observer, the SDK triggers this callback each time it receives a video frame. You need to set whether or not to mirror the video frame in the return value of this callback.
true: Mirror the captured video.
false: (Default) Do not mirror the captured video.