Set rate at which AVSampleBufferDisplayLayer renders sample buffers

Question

I am using an AVSampleBufferDisplayLayer to display CMSampleBuffers which are coming over a network connection in the h.264 format. Video playback is smooth and working corr

Answer 1

Set output presentation timestamp on sample buffer before enqueuing it to AVSampleBufferDisplayLayer. For FPS = 30:

CMSampleBufferSetOutputPresentationTimeStamp(sampleBuffer,    CMTimeAdd(kCMTimeZero, CMTimeMake(1 * _frameCount, 30)));

Set the timestamp on first buffer to 0 (kCMTimeZero) and increment the timestamp on subsequent buffers by 1/30th of a second.

Also, need to set timebase on AVSampleBufferDisplayLayer instance so that buffer with presentation timestamp set to 0 is displayed first.

CMTimebaseRef controlTimebase;
CMTimebaseCreateWithMasterClock(CFAllocatorGetDefault(),    CMClockGetHostTimeClock(), &controlTimebase);

_videoLayer.controlTimebase = controlTimebase;
CMTimebaseSetTime(_videoLayer.controlTimebase, kCMTimeZero);
CMTimebaseSetRate(_videoLayer.controlTimebase, 1.0);