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

["Edward Wildgoose" <ed@wildgooses.com>]

> > 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



-- 
Info:
To unsubscribe send a mail to ecartis@linuxtv.org with "unsubscribe linux-dvb" as subject.