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[linux-dvb] Re: Audio sync



Klaus Schmidinger wrote:
Holger Waechtler wrote:

Marcus Metzler wrote:

Antti O Lammi writes:
>
> > Does anybody else have problem with audio sync, it is quite bad (nearly
> > ridiculous) on Nexus DVB-T, not so bad on Nexus DVB-S.
> > Yesterday I tested the version on CVS, no better than before.
> > The driver I'm using now is linux-dvb.2002-12-08.tar.bz2 pack from
> > vdr-project, no problem there.
>
> I have had the same problems since the LinkLayer CAM change for VDR (the
> firmware changed). I can't use the new drivers/VDR at all because of this.
> Still using VDR 1.1.19. ;-(
>

Does that also happen with our firmware (i.e. www.metzerbros.org/dvb)?
it's a bug (or missing feature?) in VDR, the PCR PID is not correctly
set up. I think this will get fixed soon.

Well, I wouldn't know how!

Are you saying VDR should set VPID, APID _and_ PCR-PID when recording?
Would it then receive extra TS packets with the PCR-PID?
What should it do with those? Would they have to be used when
converting TS to PES in remux.c? What if PCR-PID == VPID?

So far for channels where PCR-PID == VPID things appear to work fine.
Since Oliver Endriss' driver fix live tv as well as replaying recordings work
great. So apprently in case PCR-PID == VPID there's nothing else VDR
would have to do, I guess.
If no PCR PID is given the the firmware assumes the PTSs transmitted on the video substream. It will peel out the PTS values out of the video PES packets.


What's the reason to have an extra PCR-PID, anyway?
To allow to transfer PCRs values on non-Video substreams.

Holger



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