[mythtv-users] Cannot change channels with M179

Scott Alfter mythtv at salfter.dyndns.org
Wed Jul 20 00:45:39 EDT 2005

On Wed, Jul 06, 2005 at 12:24:24PM -0400, Joseph A. Caputo wrote:
> On Wednesday 06 July 2005 8:36, Robert Kulagowski wrote:
> > I have the same problem with my M179's; your question is better suited 
> > for the ivtv mailing list.  The last known-good version of ivtv (for 
> > me)  
> > for the M179 is pre-100b, which was a long, long time ago.
> FWIW, I'm running 0.2.0-rc3b with 2 M-179's with good results.

Are you running into any signal-quality issues, by any chance?  I got one of
my M179s running again (this time alongside a PVR-350 and a PVR-250MCE). 
I'm using the same ivtv version as you, with the kernel (2.6.9) tuner.ko
used instead of the one provided with ivtv.  Passing the tuner types (8 for
the PVR-250MCE, 2 for the PVR-350 and M179) to ivtv got the tuners on all
three cards working.

However, the signal quality on the M179 is still far inferior to the two
Hauppauge cards.  The tuner input picks up more RF noise that shows up as
various kinds of interference patterns (odd, since the PVR-350 uses the
exact same tuner).  I then figured I'd go ahead and use the Hauppauge cards
to tune analog cable and plug the digital-cable box into the M179.  While
the picture quality on the S-video input is good enough, the audio has an
unacceptable amount of crackling noise in the background.

Is there anything I can do to get the M179 working better on either the
tuner or S-video input, or should I rip it back out and forget about ever
getting it working properly with MythTV?

(I've done some composite video capture with the M179 on a WinXP box, and
the audio didn't make the crackling noise it does under Linux.  Is ivtv not
initializing something on the card properly?)

 / v \ Scott Alfter
(IIGS( http://alfter.us/            Top-posting!
 \_^_/ rm -rf /bin/laden            >What's the most annoying thing on Usenet?

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