Filesink black screen first few seconds

[NickTxD]

I decode the rtp h264 stream and display it on the screen.  In a parallel
thread, recording to the mp4 file is sometimes performed.  Also, during
recording, I mix the sound through mp4mux into the file.  Separately, sound
and video are written perfectly, but as soon as I combine this, a problem
appears.  The first few seconds of the video is a black screen, but there is
sound.  At the same time, sound and video are synchronous.  How to solve
this problem?  Thank you in advance.



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