[MythDora] MythDora beta 4.0 video4linux

[Jarod Wilson]

On Monday 30 April 2007 00:16:22 gchris at bellsouth.net wrote:
> I'm looking at a problem with the 4.0 beta that's really puzzling me and I
> need some feedback.  I'm running a fe/be P4 3.0Ghz Northwood (very cool)
> machine with 2 HD3000s and a PVR-350. Video is Nvidia FX5200.  With a bone
> stock plain vanilla beta setup the PVR-350 experiences choppy sound and
> video while watching TV.  The HD3000 video and sound is normal.  If I
> uninstall the two video4linux RPMs and reboot, PVR-350 sound and video are
> then normal.

Hrm. Crap. Haven't tried w/a PVR-350. That combo works perfectly with my 
PVR-250 and my PVR-500. Ugh. And unfortunately, the 350 is the one card that 
NEEDS the v4l bits, at least for the output side of it to be functional...

> To try and get a better handle on this I re-installed the beta and after
> setup I tried starting Mythtv from an xterm window. I had to step down
> through the 2 HD tuners before starting the PVR-350 (which makes for a long
> and repetitive listing) and then ran the pvr-350 for 2 minutes before
> escaping out of Mythtv.  The xterm window showed lots of NVP: prebuffering
> pauses.
>
> I then used SMART to remove the two video4linux RPMs, rebooted and tried
> again. This time smooth audio and video and very few prebuffering pauses. 
> I'm told that V4L isn't supposed to cause problems with PVR cards so what
> is going on here? Three comments:
> - I was using ath0 not eth0.  Strange that Mythtv should care.

Huh? What cared about that? Myth shouldn't care what the interface is called, 
it should only care about your IP address(es)...

> - Real time looks not to be working but since 1080i HD playback works well
> why care about real time for SD?

Real-time what? Comm-flagging?

> - Nothing logged

From the frontend or... ?

> **** With V4L installed **********************************
[...]
> 2007-04-29 13:56:31.290 NVP: prebuffering pause
[...repeat a buncha times...]

Ew.

> 2007-04-29 13:56:32.734 TV: Attempting to change from WatchingLiveTV to
> None QObject::disconnect: Unexpected null parameter
> 2007-04-29 13:56:33.180 TV: Changing from WatchingLiveTV to None
> Segmentation fault

Also ew. Hrm.

> **** Without V4L installed **************************
> [mythtv at mediacenter ~]$ mythfrontend
[...]
> None QObject::disconnect: Unexpected null parameter
> 2007-04-29 14:12:52.885 TV: Changing from WatchingLiveTV to None
> Segmentation fault

And ew again. Do you get these with Axel's mythtv builds as well? Or only with 
the ones on the iso? Not sure what's up there, everything works quite nicely 
on my test box. :(

-- 
Jarod Wilson
jarod at wilsonet.com