输出流中的非单调 DTS 先前当前更改为这可能会导致输出文件中的时间戳不正确

Question

我有一个带有相当接近的片段的 file.txt

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
...

我把它们连接起来

ffmpeg -safe 0 -f concat -i file.txt out.mp4

我试过

ffmpeg -use_wallclock_as_timestamps 1 -safe 0 -f concat -i file.txt out.mp4

然而我得到

[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

最终文件在错误的地方被剪切。

如何使 file.txt 工作？

Answer 1

如果该部分需要用于解码目的，则 concat 解复用器将选择指定范围之外的输入部分。这些将导致时间戳冲突以及输出中的额外材料。您需要使用选择过滤器来摆脱它们。

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