[mythtv-users] artifacts in pvr-150 recordings, only recently

Mark Boyum mark at boyum.us
Mon Mar 23 04:19:56 UTC 2009


On Fri, Mar 20, 2009 at 11:02 AM, Johnny <jarpublic at gmail.com> wrote:
>> I may have missed it in an earlier post, but what OS are you running?
>> My Ubuntu 8.04 system began experiancing exactly the same symptoms
>> with at one of its PVR-150 a few weeks ago.  Macro blocking and
>> occasional static in the audio.
>>
>> I was attempting to get a non-Mythtv issue corrected at the time and
>> let Ubuntu update itself.  My desktop computer, also 8.04 but always
>> current with updates, runs a slave backend that records via a frame
>> grabber and has had no issues so I wasn't concerned.  I think I am
>> going to try running under the next oldest Kernel now that I've seen
>> your posts and the trouble-shooting you have done.
>>
>
> I am running Ubuntu 8.10 Intrepid. Last night I wiped my OS partition
> and did a clean install with Ubuntu 8.10. Then I updated mythtv
> Jean-Yves VDPAU capable .21-fixes repository. I did a complete restore
> of my mythtv database. I watched about 30-45 minutes of live tv
> without any artifacts or problems. The I set up a recording in mythweb
> so that it would record the show I was currently watching. As soon as
> I hit "update recording settings" (ie it switch from being live tv to
> being a recording), the image jumped and then the artifacts started. I
> don't really know how mythtv interacts with the ivtv drivers, but it
> seems that I have some setting in mythtv that changes the
> configuration for the ivtv driver. Next I stopped the recording and
> took a look with 'mplayer /dev/video0' and there were artifacts there
> too.
>
> So I wiped the partition one more time, did a clean install, and only
> used the mythtv from the Ubuntu repositories. I also didn't do a full
> database restore, I did a partial restore using the new backup/restore
> scripts. So only my recordings were restored and none of my settings.
> I made a few hours of recordings last night and everything was fine.
> So next I updated to the mythbuntu weekly builds. I made a couple more
> recordings and I haven't seen problems yet. So at this point I know it
> was either some mythtv setting that was in my database, or it was
> running the VDPAU patched version of .21-fixes. If things go well
> today, I will update to the VDPAU version tonight and see what
> happens. If everything is still good then I at least know it was some
> mythtv setting from the database, but I am not going to go back and
> try to figure out exactly what it was.
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>

My PVR-150 did this while running Ubuntu 8.04 with kernel
2.6.24-23-generic.  This morning I rebooted the Myth box into
2.6.24-16-generic and have had no issues.  I'm guessing it has
something to do with the ivtv modules and the kernel.

I hope that helps someone,
-Mark


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