First of all I want to thank everyone involved for providing KnoppMyth, it finally brought me close to a perfectly working pvr after some unsuccessful tries with other distributions!

After reading lots of news and googling around one weird problem with the sound during capturing is left.

Prerequisites:
- Asus Pundit with PVR350
- KnoppMyth R4 with MythTV .13 from the debs and the latest ivtv CVS tarball (however, the problem also occurred with .12 and an older ivtv version)
- deleted the xawtv-call in Knoppmyth-run so the muted sound (test_ioctrl -y mute=0) is no more a problem
- switching channels in LiveTV works fine, with sound

Ok, now here comes the problem:
After a number of perfect recordings (usually 2-3) with sound the next recording has no sound at all. I have the feeling that this especially happens when recoding the second of two back-to-back broadcasts in the same channel.
When I delete the recording and go to LiveTV there is also no sound.
test_ioctl -a shows mute=0 so that's not the problem.
/var/log/messages and /var/log/mythtv/mythbackend.log show nothing unusual.

After restarting the mythbackend during a no-sound-recording (/etc/init.d/mythtv-backend restart) the current recording is restarted too and sound is back.

I have no more ideas how to fix that and google neither has.

Cheers,
rachengold

Tough one....But it sound like it maybe related to ivtv. Have you tried the ivtv archive?

_________________
cesman

When the source is open, the possibilities are endless!

that is odd. I had this happen one time during the couple months I've been using knoppmyth, but I just thought it was a fluke, because I record about 30 hours a week and it only happend once.

@cesman

right, it was a good hint to focus me on the ivtv driver.
I found out that the msp3400 kernel-module shall be called with parameters as described in the MythTV-howto and in http://ivtv.writeme.ch/tiki-view_faq.php?faqId=1#q30 which is not done in KnoppMyth R4.

I added a file msp3400 in the /etc/modutils directory which contains one line:
options msp3400 once=1 simple=1 standard=0x03 (for germany)

and ran update-modules to transfer changes in modules.conf.

Now everything seems to be fine.

Implementing the parameters in R5 might be a good idea?

cheers
rachengold