Hi Sir/Madam, 

We encountered some issue on the CCTV recording for Video and Audio. The model 
of the CCTV camera we are using is Samsung SND-6084R. 

1) For short recording say like 10-15 minutes, we are able to achieve both 
video and audio in sync. After 15 minutes or so, the recorded video and audio 
is not in sync. Is there any method whereas I can achieve both video and audio 
in sync?  

Here's our command to trigger the recording: 

-i rtsp://admin:[email protected]:554/profile3/media.smp -vcodec libx264 
-pix_fmt yuv420p -b 600k -maxrate 600k -minrate 600k -bufsize 600k -vsync -1 
-async 1 -qmax 50 -b_strategy 50 cctv.avi 

2) Error Message: Non-monotonous DTS in output stream. This may result in 
incorrect timestamps in the output file. 

Is there a way to resolve this error message? 

3) We are unable to record more than 45 minutes as the ffmpeg will stop 
recording. We check the connection of our CCTV, it's still alive.  

Please advise. 

Thanks and Warmest Regards, 

Vincent 

 
 



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