[linux-dvb] Re: Audio sync

[Ralph Metzler <rjkm@metzlerbros.de>]

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.
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 ...


Ralph


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