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Comments on ffmpeg - concatenating identical audio-only files results in "non-montonic DTS" warning

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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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1 comment thread

Off-topic? (2 comments)
Off-topic?
Derek Elkins‭ wrote 6 months ago

This seems to be a question about how to use a program, not how to write programs or use tools involved in developing software. Maybe the Linux site would be a better fit?

Trevor‭ wrote 6 months ago

Yeah this community might not be a perfect fit for this question, but it was the closest I could find out of all the Codidact & TopAnswers communities (I'm trying to avoid StackExchange). Since ffmpeg is multi-platform, I figured Linux wasn't the right community.