Non-monotonous DTS in output stream previous current changing to This may result in incorrect timestamps in the output file
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The concat demuxer will select portions of the input outside the stated range if that portion is required for decoding purposes. These will cause a timestamp clash as well extra material in your output. You'll need to use the select filter to get rid of them.
ffmpeg -safe 0 -f concat -segment_time_metadata 1 -i file.txt -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 out.mp4
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Vitalis Hommel
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Updated on July 09, 2022Comments
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Vitalis Hommel almost 2 years
I am having a file.txt with rather close snippets
file 'input.mp4' inpoint 1.5402465510368346 outpoint 2.722609395980835 file 'input.mp4' inpoint 3.192511146068573 outpoint 7.074568028450012 file 'input.mp4' inpoint 7.851800565719604 outpoint 9.023683423995971 file 'input.mp4' inpoint 10.054571752548219 outpoint 12.008032734394073 file 'input.mp4' inpoint 18.70977670431137 outpoint 21.20993923664093 file 'input.mp4' inpoint 24.51183382153511 outpoint 26.465287650823594 ...
I concat them with
ffmpeg -safe 0 -f concat -i file.txt out.mp4
and I tried
ffmpeg -use_wallclock_as_timestamps 1 -safe 0 -f concat -i file.txt out.mp4
Yet I get
[mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2069, current: 2067; changing to 2070. This may result in incorrect timestamps in the output file. [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2070, current: 2067; changing to 2071. This may result in incorrect timestamps in the output file. [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2071, current: 2067; changing to 2072. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 2758, current: 2756; changing to 2759. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time Last message repeated 5 times [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7581, current: 7579; changing to 7582. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7582, current: 7579; changing to 7583. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7583, current: 7579; changing to 7584. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7584, current: 7579; changing to 7585. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7585, current: 7579; changing to 7586. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7586, current: 7579; changing to 7587. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7587, current: 7579; changing to 7588. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7588, current: 7579; changing to 7589. This may result in incorrect timestamps in the output file. [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7589, current: 7579; changing to 7590. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time [mp4 @ 00000178c514cc00] Non-monotonous DTS in output stream 0:1; previous: 7590, current: 7579; changing to 7591. This may result in incorrect timestamps in the output file. [aac @ 00000178c50f8a80] Queue input is backward in time
And the final file is cut at wrong places.
How to make the file.txt work?
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Guglie about 4 yearsselect filter documentation at this link 👈
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Hashim Aziz about 3 yearsSince this requires a re-encode, does it render the concat demuxer redundant? At that point would it be the same thing to just encode without using the concat demuxer?
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Gyan about 3 yearsYou would have to feed all files individually as inputs with
-ss
and-to
for each and then use concat filter. If it's a few files, manageable else it will get too tedious. -
QkiZ about 2 yearsit also works with x11grab