[mythtv-users] PVR500 and recent mythtv-backend versions

[Eric]

yeah i've seen the same issue with my pvr500.  i was running ubuntu hardy
with the same skippy picture pretty frequently for the last 6 months.  i
just reinstalled to mythbuntu jaunty and see the same thing.  starting up if
i cat /dev/video0 or dev/video1 > /tmp/foo it looks great.  but on the same
channel in mythtv i get skippy video.  killing off mythtv and doing the same
cat trick i get skippy video.  i didn't try the rmmod/insmod but restarting
definitely takes things back to normal.  seems like mythtv has to be doing
something to ivtv or the kernel for it to require an rmmod+insmod/reboot to
clear it up (after shutting down mythfrontend/mythbackend) right?

don't really see anything in /var/log/mythtv/* about it.

eric

On Mon, May 4, 2009 at 6:07 AM, James Warden <warjamy at yahoo.com> wrote:

>
> I simply downgraded the mythbackend package to lenny (my server runs debian
> sid + a touch of experimental, maybe not the smartest for a server but I
> like bleeding edge stuff). Since the debian packagers kept the myth protocol
> version at 40 across all the debian branches, my sid mythfrontend connects
> fine with the lenny backend. SO my system got back to normal. I have simply
> no clue as to the root cause of the problem I observed. I am using kernel
> 2.6.29.1 on the server, which comes with ivtv 1.4.0. I compiled v4l-dvb
> which includes ivtv 1.4.1 and I see no difference at that level. ivtv has
> never been the issue here. It really is a mythbackend upgrade. Whether I use
> the experimental package or compile it myself (even the QT4 port), I get the
> same crap. Since my using mythtv is rather simple, going back to a 6 months
> old version of the backend is no bother. Images are beautiful again and the
> system seems very stable again.
>
> I hope you'll find a workaround or a fix.
>
> Cheers!
> J.
>
> --- On Mon, 5/4/09, John Drescher <drescherjm at gmail.com> wrote:
>
> > From: John Drescher <drescherjm at gmail.com>
> > Subject: Re: [mythtv-users] PVR500 and recent mythtv-backend versions
> > To: warjamy at yahoo.com, "Discussion about mythtv" <
> mythtv-users at mythtv.org>
> > Date: Monday, May 4, 2009, 8:44 AM
> > On Sat, May 2, 2009 at 5:12 AM, James Warden
> > <warjamy at yahoo.com> wrote:
> > >
> > > Hello,
> > >
> > > I've been using mythtv for a long while now on a
> > home network. The server is debian based, contains a PVR500
> > card (not the newer ones with digital chips, only the good
> > ol' analog tuners). Clients are linux or windows based.
> > >
> > > Anyway, I recently upgraded the server to kernel
> > 2.6.29.1-1-686 from debian. It contains ivtv version 1.4.0.
> > >
> > > I checked the driver was working well by the trivial
> > 'cat' test:
> > > cat /dev/video0 > file.mpg and played the mpg file
> > with mplayer or others
> > > same with /dev/video1
> > >
> > > So far so good. I also upgraded the mythbackend to
> > what debian multimedia is providing : 0.21.svn20090430-0.0
> > >
> > > After this upgrade, all my frontend clients are
> > showing a quite scrambled picture. I can still see what it
> > is about but it is noisy, as if someone was detuning the
> > channel frequency on purpose and randomly.
> > >
> > > When I do a /dev/videoX dump afyer that, I get a
> > screwed mpg file. Only an rmmod ivtv followed by modprobe
> > ivtv will fix it. But starting the backend again will screw
> > it up once more.
> > >
> > > I tried the SVN code as well, the QT4 port. It
> > compiled fine and ran fine but with the same image symptom.
> > It is not the first time I see this in all these years,
> > using the PVR500 with the debian mythtv-backend package.
> > Usually, I just compiled the SVN code and things were fine
> > again but not this time. I believe recent mythbackend
> > updates must screw something with the PVR500. This is not an
> > ivtv issue as a fresh modprobe and /dev/videoX dump will
> > produce a clean image.
> > >
> > > Anyone with something similar ? If not, I'll
> > provide more technical details.
> > >
> >
> > I am not seeing that effect however I after checking every
> > recording I
> > did have 2 bad recordings in the last 2 weeks. And what I
> > mean by bad
> > was one had no volume and the other had no volume and no
> > picture. Now
> > the problem is that I upgraded mythtv, my kernel and ivtv
> > within the
> > last 3 weeks so not sure what one caused it. And since this
> > is
> > different bad behavior from yours I am not sure.
> >
> > John
>
>
>
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