[gentoo-user] OT - MythTV recordings are jumpy

[gentoo-user] OT - MythTV recordings are jumpy

[Michael Sullivan]

My MythTV recordings are jerky.  Every couple of seconds the recordings
will jump sort of pause for about half a second and then jump ahead.
Has anyone else seen this?  How can I fix it?  Here's my info:

camille ~ # uname -a
Linux camille 2.6.22-gentoo-r5 #1 SMP Fri Sep 14 09:53:08 CDT 2007 i686
Intel(R) Celeron(R) CPU 2.66GHz GenuineIntel GNU/Linux
camille ~ # emerge -pv mythtv ivtv

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ] media-tv/mythtv-0.20.2_p14324  USE="alsa dvb dvd ivtv
jack joystick lirc mmx opengl perl vorbis (-altivec) -autostart
-backendonly -crciprec -dbox2 -debug -directv -dts -freebox
-frontendonly -hdhomerun -ieee1394 -lcd -xvmc" VIDEO_CARDS="i810 via
-nvidia" 0 kB 
[ebuild   R   ] media-tv/ivtv-1.0.2  USE="-fbcon" 0 kB 




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[gentoo-user] Re: OT - MythTV recordings are jumpy

[Grant Edwards]

On 2007-09-14, Michael Sullivan <michael@espersunited.com> wrote:

> My MythTV recordings are jerky.  Every couple of seconds the
> recordings will jump sort of pause for about half a second and
> then jump ahead. Has anyone else seen this?  How can I fix it?
> Here's my info:

What PVR board do you have? 150,250,350,500?

What did you configure as the playback device?

Does mplayer playback video files smoothly on that machine?

-- 
Grant Edwards                   grante             Yow!  Bo Derek ruined
                                  at               my life!
                               visi.com            

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Re: [gentoo-user] Re: OT - MythTV recordings are jumpy

[Michael Sullivan]

On Sat, 2007-09-15 at 03:21 +0000, Grant Edwards wrote:
> On 2007-09-14, Michael Sullivan <michael@espersunited.com> wrote:
> 
> > My MythTV recordings are jerky.  Every couple of seconds the
> > recordings will jump sort of pause for about half a second and
> > then jump ahead. Has anyone else seen this?  How can I fix it?
> > Here's my info:
> 
> What PVR board do you have? 150,250,350,500?
> 
> What did you configure as the playback device?
> 
> Does mplayer playback video files smoothly on that machine?
> 
> -- 
> Grant Edwards                   grante             Yow!  Bo Derek ruined
>                                   at               my life!
>                                visi.com            
> 
As for the PVR, it's a 250.  mplayer plays videos smoothly, yes.  I'm not sure what you mean by the "playback device".  AFAIK I haven't changed it from the default, whatever that is...

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[gentoo-user] Re: OT - MythTV recordings are jumpy

[Grant Edwards]

On 2007-09-15, Michael Sullivan <michael@espersunited.com> wrote:

>>> My MythTV recordings are jerky.  Every couple of seconds the
>>> recordings will jump sort of pause for about half a second and
>>> then jump ahead. Has anyone else seen this?  How can I fix it?
>>> Here's my info:
>> 
>> What PVR board do you have? 150,250,350,500?
>> 
>> What did you configure as the playback device?
>> 
>> Does mplayer playback video files smoothly on that machine?

> As for the PVR, it's a 250.  mplayer plays videos smoothly,
> yes.

Does mplayer say it's using the Xv output device?  Something
like this?

  VO: [xv] 512x384 => 512x384 Planar YV12 

Does mplayer play the MythTV recordings smoothly?

[We're trying to figure out if the problem is in the recording
or in the playback.]

> I'm not sure what you mean by the "playback device".

When you configure the MythTV front-end you can select a device
to use for playback (for example you can use the MPEG2 decoder
in a PVR-350).  If you left it at the default value it's
probably OK.

> AFAIK I haven't changed it from the default, whatever that
> is...

-- 
Grant Edwards                   grante             Yow!  Am I elected yet?
                                  at               
                               visi.com            

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Re: [gentoo-user] Re: OT - MythTV recordings are jumpy

[Michael Sullivan]

On Sat, 2007-09-15 at 04:08 +0000, Grant Edwards wrote:
> On 2007-09-15, Michael Sullivan <michael@espersunited.com> wrote:
> 
> >>> My MythTV recordings are jerky.  Every couple of seconds the
> >>> recordings will jump sort of pause for about half a second and
> >>> then jump ahead. Has anyone else seen this?  How can I fix it?
> >>> Here's my info:
> >> 
> >> What PVR board do you have? 150,250,350,500?
> >> 
> >> What did you configure as the playback device?
> >> 
> >> Does mplayer playback video files smoothly on that machine?
> 
> > As for the PVR, it's a 250.  mplayer plays videos smoothly,
> > yes.
> 
> Does mplayer say it's using the Xv output device?  Something
> like this?
> 
>   VO: [xv] 512x384 => 512x384 Planar YV12 
> 
In gmplayer, the driver it claims to use is xv X11/Xv.  It doesn't give
me the rest of that information you asked for in the interface.  Where
would it be?
> Does mplayer play the MythTV recordings smoothly?
> 
LiveTV is smooth.  I recorded something last night that looked smooth to
me at the beginning, so it might be fixed.  I won't know for sure until
we watch the recording later today...
> [We're trying to figure out if the problem is in the recording
> or in the playback.]
> 
> > I'm not sure what you mean by the "playback device".
> 
> When you configure the MythTV front-end you can select a device
> to use for playback (for example you can use the MPEG2 decoder
> in a PVR-350).  If you left it at the default value it's
> probably OK.
> 
> > AFAIK I haven't changed it from the default, whatever that
> > is...
> 
> -- 
> Grant Edwards                   grante             Yow!  Am I elected yet?
>                                   at               
>                                visi.com            
> 

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[gentoo-user] Re: OT - MythTV recordings are jumpy

[Grant Edwards]

On 2007-09-15, Michael Sullivan <michael@espersunited.com> wrote:

> In gmplayer, the driver it claims to use is xv X11/Xv.

That's good enough -- we just wanted to make sure that the "Xv"
extension was working.

>> Does mplayer play the MythTV recordings smoothly?
>
> LiveTV is smooth.  I recorded something last night that looked
> smooth to me at the beginning, so it might be fixed.  I won't
> know for sure until we watch the recording later today...

Live TV is actually just a recording that you're watching as it
records.  So I can't think of any reason why non-Live
recordings wouldn't be smooth as well.

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Grant Edwards                   grante             Yow!  These PRESERVES
                                  at               should be FORCE-FED to
                               visi.com            PENTAGON OFFICIALS!!

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Re: [gentoo-user] Re: OT - MythTV recordings are jumpy

[Michael Sullivan]

On Sat, 2007-09-15 at 07:44 -0500, Michael Sullivan wrote:
> On Sat, 2007-09-15 at 04:08 +0000, Grant Edwards wrote:
> > On 2007-09-15, Michael Sullivan <michael@espersunited.com> wrote:
> > 
> > >>> My MythTV recordings are jerky.  Every couple of seconds the
> > >>> recordings will jump sort of pause for about half a second and
> > >>> then jump ahead. Has anyone else seen this?  How can I fix it?
> > >>> Here's my info:
> > >> 
> > >> What PVR board do you have? 150,250,350,500?
> > >> 
> > >> What did you configure as the playback device?
> > >> 
> > >> Does mplayer playback video files smoothly on that machine?
> > 
> > > As for the PVR, it's a 250.  mplayer plays videos smoothly,
> > > yes.
> > 
> > Does mplayer say it's using the Xv output device?  Something
> > like this?
> > 
> >   VO: [xv] 512x384 => 512x384 Planar YV12 
> > 
> In gmplayer, the driver it claims to use is xv X11/Xv.  It doesn't give
> me the rest of that information you asked for in the interface.  Where
> would it be?
> > Does mplayer play the MythTV recordings smoothly?
> > 
> LiveTV is smooth.  I recorded something last night that looked smooth to
> me at the beginning, so it might be fixed.  I won't know for sure until
> we watch the recording later today...
> > [We're trying to figure out if the problem is in the recording
> > or in the playback.]
> > 
> > > I'm not sure what you mean by the "playback device".
> > 
> > When you configure the MythTV front-end you can select a device
> > to use for playback (for example you can use the MPEG2 decoder
> > in a PVR-350).  If you left it at the default value it's
> > probably OK.
> >

I think I've isolated the problem.  I have an output-to-TV component
that requires 800x600 screen resolution to work.  My normal screen
resolution is 1024x768.  It works fine in 1024x768, but when I switch to
800x600 to use the video component, it's jumpy.  What would cause that?

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[gentoo-user] Re: OT - MythTV recordings are jumpy

[Grant Edwards]

On 2007-09-16, Michael Sullivan <michael@espersunited.com> wrote:

> I think I've isolated the problem.  I have an output-to-TV
> component that requires 800x600 screen resolution to work.  My
> normal screen resolution is 1024x768.  It works fine in
> 1024x768, but when I switch to 800x600 to use the video
> component, it's jumpy.  What would cause that?

I've no idea.  All my experience would lead me to expect that
running at a lower resolution would be faster (smoother) if
anything.

It's probably time to ask on the MythTv mailing list.

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Grant Edwards                   grante             Yow!  ... this must be what
                                  at               it's like to be a COLLEGE
                               visi.com            GRADUATE!!

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