Non-monotonous DTS in output stream 0:0 | Fix | FFMPEG | Termux | Android | No Root | TechComSpot
[mp4 @ 0x720be5ee00] Non-monotonous DTS in output stream 0:0; previous: 4951970, current: 4951659; changing to 4951971. This may result in incorrect timestamps in the output file.
ffmpeg -f concat -safe 0 -segment_time_metadata 1 -i mylist.txt -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 output.mp4
