Non-monotonous DTS in output stream previous current changing to This may result in incorrect timestamps in the output file

问题:

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?

... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...

回答1:

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 

文章来源: Non-monotonous DTS in output stream previous current changing to This may result in incorrect timestamps in the output file