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ffmpeg - concatenating identical audio-only files results in "non-montonic DTS" warning
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I am trying to join some video files and have an issue. I have boiled down the problem to the following minimal working example. I create a 2-second mp4 with a silent audio stream:
$ ffmpeg -f lavfi -i anullsrc -c:a aac -t 2 a.mp4
I then create a file containing the file names to be concatenated:
$ cat videos.txt
file a.mp4
file a.mp4
Then I concatenate the videos:
$ ffmpeg -f concat -i videos.txt -c copy combine.mp4
which gives me this warning:
[mp4 @ 0x638776cb5a80] Non-monotonic DTS in output stream 0:0; previous: 89088, current: 88200; changing to 89089. This may result in incorrect timestamps in the output file.
How do I properly generate the audio file so that I don't get these warnings?
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