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

[Torgeir Veimo <torgeir@pobox.com>]

On Sun, 2004-10-10 at 17:58 +0200, Ragnar Sundblad wrote:
> --On den 10 oktober 2004 16:29 +0100 Torgeir Veimo <torgeir@pobox.com> 
> wrote:
> 
> > I'm wondering if someone knows more about differences in video pts on
> > dvb-t in the uk?
> >
> > I'm getting an a/v offset of about 160ms with both xawtv and vdr w/
> > softdevice, and I've seen that PVAStrumento has an option for "relaxed
> > video pts checks" for finish / uk dvb-t material.
> 
> In VDR recordings recorded from DVB-T in Sweden, the video pts
> is often between 250 and 350 ms ahead of the audio pts.
> I haven't checked the actual DVB stream from the demux device,
> I have just assumed that this is more or less how it is
> actually transmitted.
> 
> I thought it was done like this to give more time to the mpeg
> decoding process, but I haven't checked it with the "reference
> decoder model" or whatever it's name is.

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.

-- 
Torgeir Veimo <torgeir@pobox.com>