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

[Måns Rullgård <mru@mru.ath.cx>]

Torgeir Veimo <torgeir@pobox.com> writes:

> On Mon, 2004-10-11 at 17:17 +0100, Ilariu Raducan wrote:
>> On Mon, 11 Oct 2004 17:59:31 +0200, Holger Waechtler wrote:
>> > Torgeir Veimo wrote:
>> > 
>> > >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
>> I agree with that. softdevice plays the audio with almost 1s before
>> video on some stations.
>
>> > http://212.227.36.83/linuxtv//index.php/The_DVB_Decoder_Challenge for a
>> > discussion of the topic.
>
> I thought the PCR/STC handling is to avoid clock / pts drifts, but I am
> seeing a constant, predictable offset. Does PCR/STC bring any such thing
> into the picture?

Not really.  The only explanation I can see is the player blatantly
ignoring all timestamps (including PTS), and simply playing the audio
and video as they arrive.

-- 
Måns Rullgård
mru@mru.ath.cx