[mythtv-users] What am I doing wrong?

[Stefan Haflidason]

On 3/13/06, Gavin Band <gavinband at tiscali.co.uk> wrote:
>
> > Gavin Band wrote:
> >
> > Phil Bridges wrote:
> > > > > mythfrontend --version
> > > > Library API version: 0.19.20060121-2
> > > > Source code version: exported
> > > > Options compiled in:
> > > >  linux release using_v4l using_alsa using_jack using_ivtv using_dvb
> > > > using_dvb_eit using_x11 using_xv using_dvdnav using_xrandr
> > > > using_opengl_vsync using_frontend using_backend
> > > >
> > > > The backend seems to work correctly, but I can't watch anything
> (live or
> > > > recorded) in the frontend because the display repeatedly pauses -
> then
> > > > catches up - then pauses - then catches up, etc.
> > > >
> > > > The log prints out lots of "prebuffering pause"s.
> > > >
> > > > This is with a fastish laptop, Radeon Mobility 9600 with open source
> > > > driver, Freecom DVB-T USB stick.
> > > >
> > > > Have I compiled / set something wrong?  Any help appreciated.
> > > > Thanks,
> > > > gav.
> > > >
> > >
> > > Do you have DMA activated?
> > >
> >
> > Yes I do -  hdparm reports
> >
> > > hdparm /dev/hda
> >
> > /dev/hda:
> >  multcount    = 16 (on)
> >  IO_support   =  0 (default 16-bit)
> >  unmaskirq    =  1 (on)
> >  using_dma    =  1 (on)
> >  keepsettings =  0 (off)
> >  readonly     =  0 (off)
> >  readahead    = 256 (on)
> >  geometry     = 16383/255/63, sectors = 156301488, start = 0
> >
> > Thanks,
> > gav.
> >
>
> *bump*
> Has anyone got any other suggestions for this problem?  I've tried
> various options with more than one version of MythTV, but always get the
> same - unwatchable TV, and a sequence of NVP: Prebuffering pauses in the
> output.
> Thanks,
> gav.
>
>
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>

You say the backend 'works correctly'. Can you watch live tv successfully on
that machine, or do you get the prebuffering pauses irrespective of how the
frontend is connected to the backend?

Also, are you capturing at the right resolution? If I set the resolution on
my machine to 720x480 (NTSC), then I get the behaviour your describe.
Setting to 720x576 (PAL) corrects this problem.

I only have this part of the thread (though I could find it on gossamer if
need be). Have you listed your backend hardware anywhere?

A shot in the dark if you're already capturing at the right resolution for
your region: where did you buy your capture card from? I've read of one
person who saved some money by buying from Germany, and received a card that
was incompatible with his country's TV system (which was probably NTSC).

Stefan.
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