[FFmpeg-user] ffmpeg and monotonically increasing DTS

[littlebat]

On Fri, 9 Aug 2013 17:14:51 -0700
Pushkar Pradhan <pradhan.pushkar at gmail.com> wrote:

> I have a mp4 where some of the video frames have the same DTS/PTS and
> ffmpeg refuses to copy it when I try to extract the first few seconds:
> $ ffmpeg -i full_file.mp4  -vcodec copy -acodec copy -t 45
> short_45s.mp4 ffmpeg version git-2012-04-04-41a097a Copyright (c)
> 2000-2012 the FFmpeg developers
>   built on Apr  3 2012 18:08:31 with gcc 4.4.3
>   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame
> --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libtheora
> --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3
> --enable-x11grab --enable-libvpx
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'full_file.mp4':
> Stream mapping:
>   Stream #0:1 -> #0:0 (copy)
>   Stream #0:0 -> #0:1 (copy)
> [mp4 @ 0x24b98a0] Application provided invalid, non monotonically
> increasing dts to muxer in stream 0: 119974 >= 119974
> av_interleaved_write_frame(): Invalid argument
> 
> However, when I take out the -acodec copy and -vcodec copy, i.e. when
> ffmpeg reencodes it, it does not abort.
> 
> So my question is: Is it invalid according to the MP4 spec to have
> frames with the same DTS/PTS for a video track?
> The error definitely makes sense.

You should try the lastest version of ffmpeg, I have met simlar
problem with old version, but it disappeared when use lastest version.