[MPlayer-advusers] Dirac demuxing A/V sync loss

[Diego Biurrun]

On Fri, Oct 17, 2008 at 06:29:40PM +0300, Uoti Urpala wrote:
> On Fri, 2008-10-17 at 18:00 +0400, Andrew Savchenko wrote:
> > A sample plays with -demuxer lavf, but video quickly runs out of 
> > sync, and I get a huge bunch of
> > pts value <= previous
> > messages.
> > 
> > I managed to maintain A/V sync using -mc 100 -autosync 40, but this 
> > leads to regular framedrops and choppy video playback whilst a lot 
> > of CPU available.
> > 
> > This file plays perfectly with ffplay, so I suspect a bug somewhere 
> > around libmpdemux/demux_lavf.c code.
> 
> The problem is caused by the libavcodec decoder. It leaves has_b_frames
> at 0 which is incorrect. This confuses the MPlayer timing code. If I
> force the code to assume a decode delay of 1 instead of the 0 claimed by
> the decoder then it seems to play OK.

Time to report a bug to FFmpeg/Anuradha then?

Diego