[FFmpeg-devel] [Bug] Problem on remuxing AVC in mkv to mp4, how to fix it?

[Michael Niedermayer]

On Thu, Aug 06, 2009 at 12:46:08AM +0200, Aurelien Jacobs wrote:
> On Tue, Aug 04, 2009 at 03:09:18PM -0700, Baptiste Coudurier wrote:
> 
> I guess your reply wasn't intended only for me ?
> 
> > On 8/4/2009 3:00 PM, Aurelien Jacobs wrote:
> >> This is already known as issue807 [1].
> >>
> >>> Since matroska does not provide dts (mp4 does), ffmpeg assumes dts = pts, which is completely wrong if b-frames are used.
> >>> Is that where the problem is and can anybody give suggestions on how to fix that?
> >>
> >> IIRC the problem is that FFmpeg is missing a h264 parser that would
> >> generate dts for streams which don't have it.
> >
> > FFmpeg already has a h264_parser, it does not work with MKV bitstream  
> > however.
> 
> I know we have a h264_parser but AFAIK it is not able to generate any dts.
> Is Matroska the only format storing h264 without dts ?

nut doesnt store dts either, but nut defines how one can calculate dts from
pts and the decoder delay that is a mandatory syntax element in nut.
This is of course independant of the used codec so the codec id or bitstream
never has to be touched for it ...

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Opposition brings concord. Out of discord comes the fairest harmony.
-- Heraclitus
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