how to fix Non-monotonous DTS in output stream 0:1; when using ffmpeg

Question

When I use ffmpeg to convert m3u8 to mp4, I get some warning,

ffmpeg -i xx.m3u8 -c copy demo.mp4

warning is

Non-monotonous DTS in output stream 0:1; previous: 3277744, current: 3276712; changing to 3277745. This may result in incorrect timestamps in the output file.
Non-monotonous DTS in output stream 0:1; previous: 3277745, current: 3277736; changing to 3277746. This may result in incorrect timestamps in the output file.

what should I do to fix it?

If it is single ts file try it :: ffmpeg -fflags +igndts -i *.ts -map 0:0 -map 0:2 -c:v copy -c:a copy demo.mp4 — Chandan Kumar, Apr 30 '19 at 06:10
This could happen when you try to join to videos with different frame rates — dǝɥɔS ʇoıןןƎ, Jun 24 '21 at 16:18

score 9 · Answer 1 · edited Dec 23 '21 at 12:29

9

You can try this:

ffmpeg -i xx.m3u8 -c copy -bsf:a aac_adtstoasc demo.mp4

Per this forum post, you can also try:

It seems that decoding time stamps are broken. You can try "-fflags +igndts" to regenerate DTS based on PTS:

Or point to the .ts file directly, ignore the DTS:

ffmpeg -fflags +igndts -i xx.ts -map 0:0 -map 0:2 -c:v copy -c:a copy demo.mp4

edited Dec 23 '21 at 12:29

slhck

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answered Apr 30 '19 at 06:03

Chandan Kumar

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thank you , but also get " Non-monotonous DTS in output stream 0:1; " – xiao xin Apr 30 '19 at 06:05
can u please share me hls ts format and is it nested m3u8 file? – Chandan Kumar Apr 30 '19 at 06:07
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"regenerate DTS based on PTS"? What do those abreviations mean? – zrajm Apr 25 '20 at 20:20
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"Decoding Time Stamp (DTS) and Presentation Time Stamp (PTS)" according to this question: https://stackoverflow.com/questions/6044330/ – zrajm Apr 25 '20 at 20:22
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This answer appears to quote https://forum.videohelp.com/threads/390057-FFMpeg-non-monotonous-DTS-in-output-stream-error#post2527823 – Ray Woodcock Sep 19 '21 at 23:21

score 0 · Answer 2 · answered Apr 26 '22 at 22:57

I ran into this downloading sports video from HUDL. The m3u8 file had #EXT-X-DISCONTINUITY and #EXT-X-PROGRAM-DATE-TIME directives that ffmpeg didn't handle correctly. So I just created .txt file for ffmpeg to simply concatenate the segments with the directives removed:

Find m3u8 using browser tools

cat ~/Downloads/<m3_u8 downloaded> | grep ".ts$" | awk '{print "file <url path of m3u8 file>" $1}' > files.txt

ffmpeg -protocol_whitelist file,tcp,http,https,tls -f concat -safe 0 -i files.txt -q 0 -c copy video.MTS

how to fix Non-monotonous DTS in output stream 0:1; when using ffmpeg

2 Answers2