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Problems with sound and video
http://forums.linhes.org/viewtopic.php?f=1&t=1349		 Page 1 of 1
Author:  hcp [ Sat May 01, 2004 5:12 pm ]
Post subject:  Problems with sound and video
Hi, I just installed R4V3 on a machine that previously ran Mythtv on a Gentoo installation.
This is a Nforce board, and it has two capture cards, one is a PVR250 the other a analog Happauge.

I'm having some very strange problems with this system.

1. Sound isn't working from withing mythtv (mainly tested with mythmusic) but it works perfectly if I call mplayer from the commandline (ie. mplayer somefile.mp3). I've tested all the dsp's availible for selection inside myth, but nothing from either.

2. THe tv video image is slow, ie. it seems to be running at approx 1/20 or so speed, also a channel-change freezes mythtv (or at least takes more than 12 hours to complete :-)

I'm not at that computer now, so I don't have the configs, but the only changes I've done is (from memory):
Added ivtv to /etc/modules
Changed tuner=2 to tuner=5
(all the normal stuff to get nvidia tv-out working, was really easy btw. good install script)

I'v also tried loading the various sound-oss-* modules to see if thes helped, and checked the normal settings in the mixer.

Any suggestion would be appreciated, because I don't really feel like going back to gentoo again (takes forever to do the install). Oh, everything was working fine under gentoo, so the hardware is OK (well except for that one disk of course :-(

Hans-Christian
Author:  Xsecrets [ Sat May 01, 2004 5:36 pm ]
Post subject: 
well if I'm not mistaken the pvr250 needs tuner=2. at any rate ivtv should have been detected and put into /etc/modules by the autodetect script. not sure what could be going on with the sound. are you attempting to use btaudio?
Author:  hcp [ Sun May 02, 2004 5:10 am ]
Post subject: 
Xsecrets wrote:
well if I'm not mistaken the pvr250 needs tuner=2. at any rate ivtv should have been detected and put into /etc/modules by the autodetect script. not sure what could be going on with the sound. are you attempting to use btaudio?


Actually, tuner=2 is ntsc if memory serves. Tuner=5 (and some other numbers, haven't tested all of them) is PAL.

As for the autodetection of the pvr250(ivtv) this has never happened in any version of knoppmyth I've tried (the last three) .

I am trying to use btaudio, but wheter btaudio is loaded or not does not affect sound output. Also as I noted, sound out does work fin, just not from mythtv(and modules).

Btw, since knoppmyth doesn't use devfs, how can I know which device (ie. /dev/dspX) is used by which device?


It looks like anything that tries to use the oss devices (/dev/dspX) is non-functioning, while anything that uses Alsa (ie. when I call mplayer directly) works fine. Any suggestions as to what could be wrong?
Hans-Christian
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