% ffmpeg -f concat -i lista.txt -c:a copy -c:v copy video.mpgįfmpeg version N-55393-g3b2e99f Copyright (c) 2000-2013 the FFmpeg developersĬonfiguration: -enable-gpl -enable-version3 -disable-w32threads -enable-av So this is definitely related to the audio streams, but I am not sure why and how to correct the discrepancy.I've 2 MPEG files with different order in audio and video stream, which I want to join:ĭuration: 00:00:40.14, start: 0.500000, bitrate: 7713 kb/s But if I run ffmpeg -i 1a.aac -f null - the duration is 00:00:15.09Ĭan someone please help me figure out what is going on, and how to fix it? This has cost me so much time already.ĮDIT: If I concat the video files with the audio removed, the expected 30 FPS output is produced. Running ffprobe outputs durations of 00:00:15.00 for 1v.mp4, and 00:00:15.66 for 1a.aac, which is estimated by bitrate. If I seperate the video and audio into video.mp4 and audio.aac, the audio has a duration that is ~0.1s different than the video. Some things I noticed: The 'start' parameter is negative when running the command ffmpeg -f concat -safe 0 -i concat.txt -c copy concat.mp4.

This includes asetpts=PTS-STARTPTS -async flags, aresample=async=1 I tried all of the methods of fixing this error through my research, and none of them were able to make it go away. I have seen it mentioned elsewhere that this warning can safely be ignored, but after further digging I noticed atleast one person mention this message was causing significant issues for them in subsequent editing of the outputted file. During concatenation I notice a few ' Non-monotonous DTS in output stream 0:1'.

They are all 30 fps, so I would expect the output to also be 30 fps. Here is a copy of all 3 videos, and the ffmpeg concat file I am using:įeel free to ffprobe each file and confirm they have the same parameters for concatenation. I am concatenating 3 short mp4 videos, which share the same resolution, frame rate, timebase, ect I am embarrassed to admit how much research/testing I have done to try to solve this problem.

Ffmpeg concat demuxer duration