[linux-dvb] Re: Audio sync

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Ralph Metzler wrote:
> 
> Klaus Schmidinger writes:
>  > Ralph Metzler wrote:
>  > >
>  > > Klaus Schmidinger writes:
>  > > ...
>  > >  > Are you saying VDR should set VPID, APID _and_ PCR-PID when recording?
>  > >
>  > > Yes.
>  >
>  > How does this correspond with your posting from 14:09:
>  >
>  >    During live viewing the ARM uses the PCR to set its own system clock
>  >    (STC). The PTSs (DTSs are dropped AFAIK) of the streams are then used
>  >    for synchronization.
>  >    During playback only the PTSs are used. The STC is set according to
>  >    the first PTS. It also is reset if there are large PTS gaps.
>  >
>  > This made me believe that the PCR-PID only needs to be set for _live_ tv viewing,
>  > but not for _recording_.
> 
> OK, if you record separately (not the stuff you are viewing or via
> time-shifting), you don't necessarily need to record it.
> But again, newer hardware which pipes TS playback through its hardware
> demuxer might need a PCR to work.

VDR doesn't replay TS, it stores its recordings as PES (as far as I understend these
formats) and replays that.

> Depending on how this hardware is driven (open/closed driver or
> microcode/firmware) you might not be able to work around this and will have
> to fix your files ...

But this would apply only if VDR would replay TS, right?

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________


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