[linux-dvb] Re: video pts differences on dvb-t in the uk

[Holger Waechtler <holger@qanu.de>]

Torgeir Veimo wrote:

> On Sun, 2004-10-10 at 19:07 +0200, Måns Rullgård wrote:
>  
> > > But surely the difference should be detectable in some way? I think
> > >      
> > the
> >    
> > > difference is less on some channels (TMF, some news channel). I
> > >      
> > delay
> >    
> > > video constantly by 160ms to compensate for this, but automating it
> > > would be preferable.
> > >      
> > Are the PTS values offset from the true values?  Or are you using some
> > player that doesn't use PTS for synchronization?  Both sound pretty
> > broken to me.
> >    
> I'm not too familiar with mpeg2 and a/v pts.. I see the problems with
> both xawtv and vdr's softdevice. I believe the correct term isdvb
> transmission audio preload time? Is there any such thing in dvb-t
> transmission headers?
>  
It's not a DVB-T specific problem. Both the softdevice plugin and xawtv 
don't implement proper PCR/STC handling. See 
http://212.227.36.83/linuxtv//index.php/The_DVB_Decoder_Challenge for a 
discussion of the topic.

Holger