[FFmpeg-devel] [PATCH] lavf/movenc: Replace dts by pts to calculate duration

[manuelyuan]

Of course I did，and I can give you the bad case videos for your analysis if you need. 
How can I give them to you？

At 2019-11-28 14:38:34, "Carl Eugen Hoyos" <ceffmpeg at gmail.com> wrote:
>
>
>> Am 28.11.2019 um 03:34 schrieb manuelyuan <manuelyuan at 163.com>:
>> 
>> In this case, the input video is of dynamic frame rate and we don't want to
>> duplicate or drop frames, but the output video duration calculated by DTS is
>> incorrect, I solved it by using PTS.
>> There are many UGC videos with dynamic frame rates, which are represented by
>> PTS jumps. After transcoding with ffmpeg -vsync 0 or -vsync 2, the output
>> video duration becomes longer.By reading the code of x264/encoder/encoder.c,
>> I found that in order to predict the B frame, x264 needs to ensure that there
>> are enough reference frames when DTS = 0, so the DTS of these reference frames
>> will subtract the cache time. However, the cache time includes the part of PTS
>> jumps, which results in the abnormal small DTS.
>
>Do you have access to a stream analyser to verify the output file with your patch?
>
>Carl Eugen
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