[linux-dvb] Re: Still A/V sync problems (PCR error?)

["Y2 Plugh" <y2_plugh@hotmail.com>]

Johannes,

I am running vdr 1-2-5, dvb 20-10-2003 (firmware 13-10-2003, NOT old-icam)
I do have some vdr-patches, but do not believe it's a vdr problem.
With "getavpid" I also looked during the tests at the pid numbers (set by 
vdr, and or patches),
even without PCR pid number (reported by getavpid as 9FFF), I got the STC 
jump between
transponder time and recording time.
The only way to get rid of these jumps is switching to another transponder, 
so my conclusion
is that it's not in the recording itself, but must come from the transponder 
of the current
tuned channel. (Another indication of this is the exact match of transponder 
timestamp
and what I see in get_stc)
I believe this timestamp can only come from the transponder PCR, since vdr 
is not telling
the driver the PCR pid, I concluded that the driver (firmware) must be doing 
this.

I will test with vanilla-vdr if you think it's a usefull extra test,well I 
will test anyway this evening:-)


> From: Johannes Stezenbach <js@convergence.de>
> To: Y2 Plugh <y2_plugh@hotmail.com>
> CC: linux-dvb@linuxtv.org
> Subject: Re: [linux-dvb] Still A/V sync problems (PCR error?)
> Date: Wed, 5 Nov 2003 14:24:48 +0100
>
> Y2 Plugh wrote:
> >
> > On a "good" transponder, I see the STC value incrementing, when I start
> > play-back, the STC "jumps" to the values from the recording, and back
> > when I stop play-back.
> > On a "error" transponder the values jump between the values
> > from the recording, and the values normaly send on the transponder.
> > This "error" transponder is 12515 H S19,2E (Dutch).
> > On this transponder there is a seperate PCR pid (for all channels).
> > As far as I could test ,the problem is independent from PCR settings
> > I put in vdr.
> > Even if I do not define any PCR (or a wrong one),
> > when I start the playback, the STC will
> > somehow pick-up the transponder PCR value.
>
> Which VDR version do you use? Have you applied any patches to VDR?
>
> > I believe this can only happen if the firmware still scans the PMT for
> > this PCR pid in some situations.
> > Can this be thru ?
>
> The normal firmware does not do that. The old -icam firmware needs
> to do it for CAM support, but -icam is deprecated and vdr users don't
> need it anyway.
>
> Johannes
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