[mythtv-users] Re: SAA7134 (Flyvideo 3000) not alwayscapturingaudio

[joel at rosafluffmoln.nu]

Actually, I dont think your supposed to get audio from the output on the 
backside when using the audio over PCI.

I have used a Terratec Cinergy 400 for a while, its also SAA7134. I dont record 
that much but I have only gotten 1 or 2 recordings without audio. I have maybe 
recorded like 100 times or so. 

But I have sometimes no audio in livetv, and it seems like its always the same 
chanels so I think it might be a driver-tuner error.

Cheers, 
Joel

Citerar Christian Hack <christianh at pdd.edmi.com.au>:

> > -----Original Message-----
> > From: mythtv-users-bounces at snowman.net 
> > [mailto:mythtv-users-bounces at snowman.net] On Behalf Of Christian Hack
> > Sent: Tuesday, 15 July 2003 7:27 PM
> > To: 'Discussion about mythtv'
> > Subject: RE: [mythtv-users] Re: SAA7134 (Flyvideo 3000) not 
> > alwayscapturingaudio
> > 
> > 
> > > -----Original Message-----
> > > From: mythtv-users-bounces at snowman.net 
> > > [mailto:mythtv-users-bounces at snowman.net] On Behalf Of Rob Nielsen
> > > Sent: Tuesday, 15 July 2003 6:57 PM
> > > 
> > > CH wrote:
> > >  >Anyone else had similar problems? I don't think it's the 
> > > driver since 
> > >  >if I use aplay /dev/dsp1 (the device created by the SAA7134 
> > > driver) it
> > >  >always works. It only seems to happen with Myth capturing 
> > the audio.
> > > 
> > > Hi.  I've just setup a system with 2 Flyvideo 3000 cards 
> > > (sound through 
> > > PCI bus) and am experiencing exactly the same thing.  It is 
> > > definately 
> > > on the recording side and looks like either a problem with 
> > > the driver or 
> > > the way MythTV tunes the channels as plugging speakers 
> > > directly into the 
> > > capture card produces no sound when it happens.
> > > 
> 
> I believe this is probably a driver issue. After pluggin speakers into
> the audio output of the tuner card, I have verified that the tuner is
> not outputting any sound. This is watching LiveTV. However when I drop
> back to the menu with the escape key, I can then hear the sound. It's as
> if something in the driver is not being toggle when it should and vice
> versa. i.e. some kind of mute is being toggle rather than set. Points
> toward the driver some more I believe.
> 
> > 
> > Well at least it is reproducable. I haven't tried plugging speakers
> > directly into the tuner card when there is no audio, but I 
> > will tonight.
> > If as you report, no sound is coming from the card, then it basically
> > has to be a driver issue rather than a MythTV issue. Myth 
> > simply sets a
> > channel though V4L interface as I understand and then records from
> > /dev/videox and /dev/dspx.
> > 
> > > Other things I've found is that after a reboot, both tuners almost 
> > > always have no sound initially and I need to go to Watch TV, 
> > > ESC, Watch 
> > > TV... a few times to get them going but then after that you get the 
> > > occasional recording with no sound.
> > 
> > I am seeing this exact behaviour too.
> > 
> 
> After a bit a mucking around last night, it seems a reboot makes it
> happen more for the initial few goes. Some sort of initialization thing?
> 
> > > As a workaround for this, if the cause can't be found, how 
> > > hard would it 
> > > be to sample the sound for a small period of time after a 
> > > channel change 
> > > and if there is no sound detected, then try retuning?
> > 
> > I'd rather fix it in the driver if possible than go hacking myth code.
> > 
> > I am back on the video4linux list and once I get a good description I
> > will see what Gerd thinks. I'm unable to find any technical 
> > doco on the
> > SAA7134 (registers etc) so he's possibly the only one who can help.
> > 
> 
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at snowman.net
> http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
>