[mythtv-users] HD Recordings on Regular TV

[Mitch Gore]

Using a better video card that can take the current drives will probably
help alot.  Not to mention a "faster" video card will offload more CPU
cycles.  Atleast that is what i have noticed anyway.

Mitchell

On 4/26/07, Robert Macaulay <robert.macaulay at gmail.com> wrote:
>
> > myth 0.20 from atrpms(build 155), nvidia 9631(yes, legacy). Xorg
> > 7.1.1, KDE window manager. glx disabled
> >
> > and I'm currently performing this on mythfront start
> > /usr/bin/nvidia-settings --assign="XVideoBlitterSyncToVBlank=0" \
> >         --assign="XVideoTextureSyncToVBlank=0" \
> >         --assign "SyncToVBlank=0"
> >
> > The glx disablement and the nvidia-settings were all grasps at
> > stability(various mailing list posts).. I had a brief but
> > wife-alienating lockup series of events where watching live TV would
> > lock up X(ie, reboot time). This was in the XvMC days as well.
> >
>
> More info:
> * Linux mythbackend 2.6.20-1.2944.fc6 #1 SMP Tue Apr 10 17:46:00 EDT
> 2007 x86_64 x86_64 x86_64 GNU/Linux
> * Content was HD recording from HDHomeRun
> * Deinterlacing. Even though this is a SDTV, w/out interlacing, I saw
> the effects when watching tv. Pans would have horizontal lines across
> them where the frames weren't lines up. Either way, turning that off
> solved nothing
> * Also tried Standard vs the lib MPEG decoder(the non XvMC one). No
> difference.
> * Re-enabled all the default settings in nvidia-settings(vsync, etc).
> * re-enabled glx
> * running at "720x480" now. Much cleaner picture. Still have same
> playback issues though.
> * realtime threads enabled and working
> * was using a spdif alsa config to enable softvolume. Disabled that.
> Output now just going through normal alsa channels(just the rate dmix
> plugin active). Either way, its AC3 audio, so the passthrough setting
> straight to the SPDIF works eliminating any system processing. Amp
> goes into digital mode properly.
> * XvMC did allow proper playback, but at cost of instability(this is a
> backend/frontend box. Locking up is bad).
>
> The cpu is split 75% mythfrontend and 25% Xorg. No io waits. About 5%
> in system, the other 95% is user space.
>
> Watching same content on a slightly more powerful remote frontend
> box(3200+) via vga(1360x768) results in if I recall about 50-60%
> usage.
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