[vlc-devel] Re: Clock synchro problems - proposed solution

Marian Durkovic md at bts.sk
Thu Nov 10 10:00:48 CET 2005

> >   Please find the new - now much simpler version of my synchro patch in the 
> > attachment. 
> This patch is indeed much cleaner, but even if everyone agreed that this
> was the right way to go, I don't think this is the right place to
> implement it. The function changed is called input_ClockSetPCR and is
> part of the very core of vlc, so I think it should really set pcr, as
> that is it's name. If you want some pcrs to be ignored you should rather
> update whatever calls this function to do the pcr ignoring. In your case
> it would seem that this is the mpeg2 ts demuxer. I think handling cases
> like having several PCR in the same packet would be much easier from the
> ts demuxer. I guess the same is the case for the from the OSes IO-jitter
> you talk about.

Well, I don't think this would be possible, since input_ClockSetPCR is doing
a lot of actions before it tries to update the cr_delta. I'm afraid those
actions should be performed for every PCR, or?

The real problem here is the cr_delta being updated too frequently which
breaks the reference time base - even on a local LAN since OS IO-jitter is 
unavoidably present at both sender and receiver. So it's only this single 
action which needs to be performed at different intervals - e.g. once per 

	WIth kind regards,


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