[FFmpeg-devel] [PATCH V2] ffmpeg: fix video_delay warning for HEVC/MPEG4 decoding

mypopy at gmail.com mypopy at gmail.com
Thu Sep 27 03:44:52 EEST 2018

On Thu, Sep 27, 2018 at 4:09 AM Michael Niedermayer <michael at niedermayer.cc>

> On Wed, Sep 26, 2018 at 06:03:19PM +0800, Jun Zhao wrote:
> > For HEVC/MPEG4, we also need video_delay from the decoder, when decoding
> > some HEVC/MPEG4 clips, got numerous log like:
> > "video_delay is larger in decoder than demuxer", similar ticket: #3711
> for mpeg4 this looks incorrect.
> What your patch does is simply override the "demuxer side" but the patch
> never explains why this would be the correct solution or why the demuxer
> side gets the value wrong
> Obviously if something (like the "demuxer side") gets a value wrong the
> obvious solution is to fix that. For H264 determining the delay is rather
> hard in some corner cases (as a result of the field that would signal the
> delay being optional and not available in all streams)
> So please either fix the code that is responsible for this being set
> wrong in mpeg4 or explain why we should hack around it instead of
> fixing it.
> thx
> So I need to dig in and root cause, I agree.

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