Pb with fps with mp4mux

[alxg]

Well you dont have to transcode the video if you can afford a secondary "post
processing stage"
After each recording you can remux it as discussed here: 
https://superuser.com/a/1291513 <https://superuser.com/a/1291513>  
In your case run these two commands:
ffmpeg -i file.mp4  -c:v copy test.h264
ffmpeg -r 25 -i test.h264 -c:v copy test.mp4

If you run ffprobe on test.mp4 you will see 25.00fps

I have the same issue with mp4mux and incoming h264 frames and so far I have
not found a Gstreamer based solution



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