[linux-dvb] Re: No sound on some channels (sometimes)

[ABBAS AL-MUTAWA <abbasalmutawa@yahoo.com>]

Hi

i have same problem with Twinhan DST running under
2.6.0 with xine.

i think it is dvb driver bug!

Thanks




--- Edward Wildgoose <ed@wildgooses.com> wrote:
> > > although I believe that this bug is well known
> by the dvb-developer,
> I'll
> > > describe it another time:
> > >
> > > Many people noticed, that the sound on some
> channel gets lost and only a
> > > restart of the dvb driver solves that problem.
> In my case I'm pretty
> sure, that
> > > this problem doesn't exist within dvb-driver
> from 20.09.2003. But some
> other
> > > people on the vdr-ML said, that they have this
> problem with drivers
> before
> > > that date. Affected channels are: RTL, ARD.
> > >
> > > Oliver Endriss wrote on the vdr-ML:
> > > * I often have missing sound on ARD (pid 102),
> but sometimes other
> > > * pids are affected (101, 104). 101 is used by
> picture on ARD, 104
> > > * by sound on RTL...
> > > *
> > > * This is a known and pretty old bug. I had some
> off-list discussion
> > > * with the driver developers in April 2003 about
> this issue. It was
> > > * mentioned on the ML several times, too.
> > >
> > > As discussed on the vdr-ML this problem occurs
> on a DVB-s 1.3 and 1.6 as
> > > well as with a Nexus. I've tried recent
> dvb-driver and dvb-kernel with
> the same
> > > result.
> > >
> > > Has anyone of the driver-gurus an idea, where we
> can start to get rid of
> > > this problem?
> >
> > I wouldn't call myself a "driver guru", but here's
> an observation I made:
> >
> > The Sat.1/Pro7 transponder uses the PIDs 97...107
> for their PMT data.
> > Maybe, when switching from a channel on that
> transponder to, say, RTL
> > the PID 104, for instance, is still in use by the
> PMT section filter
> > and thus can't be used for audio at that time.
> >
> > VDR does stop all section filtering before
> switching channels, so I
> > would assume that from VDR's point of view the
> PIDs should all be
> available
> > as necessary. Maybe there is a race condition in
> the driver that causes
> > the already freed PIDs to still be "in use"?
> >
> 
> Interesting.  Just to add one more observation. 
> Since updating from kernel
> 2.6.0pre9 to 2.6.1-mm2 I notice that mythtv has
> started recording some
> programs without sound.  It has only happened twice
> or so in the last few
> days.  But today, live TV wasn't recording sound and
> it did restart after
> stopping recording and then resuming (no need to
> unload drivers I think?)
> 
> I don't believe that mythtv code has changed
> substantially in this area, and
> until I saw this post I had assumed some random
> problem in the myth code...
> Perhaps not though.
> 
> Card is a Nova-T
> 
> Thanks
> 
> Ed W
> 
> 
> 
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