[vlc-devel] h.264 stream with gaps in frame num

[Kaarlo Räihä]

Ashok Ayyamani kirjoitti 19.10.2008 kello 05:15:
> The video is recorded, so I dont have the original video. The dropped
> packets are never referenced in the
> decoder. H.264 Compliant decoders should be able to ignore these
>  gaps and
> play the elementary
> streams. The H.264 decoder used by VLC is not compliant ???
> 
> - aa

I meant you can demux the one you created with YAMB+MP4box. So put .264 inside .mp4 and take it out to .264 and see if there is difference. 

FFmpeg/libavcode H.264 decoder used in VLC isn't the fastest one and it has some problems with certain H.264 streams so it is possible that you see errors. Have you tried VLC 0.9.4 ? 

> 
> On Fri, Oct 17, 2008 at 11:48 PM, Kaarlo Räihä
>  <agent_007 at luukku.com> wrote:
> 
> > Ashok Ayyamani kirjoitti 18.10.2008 kello 04:02:
> > > I have a H.264 elementary bit stream with gaps in frame numbers ( it has
> > > some dropped packets ). VLC (0.9.2) is unable to play the stream
> > >  properly.
> > > But when I convert the H.264 file to mp4 format ( using YAMB), I am
> > >  able to
> > > play it perfectly. Whats going on ? Does the mp4 file invoke a different
> > > decoder than the one used for an elementary stream ?
> > >
> > > thanks
> > > - aa
> >
> > The decoders should be same. I assume mp4box muxing fixes the frame
> numbers
> > because it does that also on splitting. You can verify this by demuxing
> the
> > video out and comparing it to original.
> >
> > ...................................................................
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