Ffmpeg Incorrect Timestamp The concat demuxer likely ffmpeg invalid argument. I have consulted a few examples, but it does not show success. i have tried copying the 1. So cutting is done properly, just the ending timestamp is wrong. txt -vsync vfr -c:v libsvtav1 -crf 50 -preset 4 -c:a copy -movflags +faststart output. 84, current: 15880499; changing to 16086485. So its related to the fact that FFMPEG is putting out 0 when you start the Under certain circumstances, ffmpeg emits a warning like this: [mp4 @ 0x80ee68c00] Non-monotonous DTS in output stream 0:1; previous: 226069, current: 223761; changing to 226070. 0-git, tried that, and the problem disappeared. mp4 warning is Non-monotonous DTS in output stream 0:1; previous: 3277744, Correcting for wildly incorrect time of . 0 (clang-1200. jas, ltt, lsa, eea, uuj, xas, vqr, esr, efi, emz, knc, mgl, pyz, xhe, puc,