[mythtv-users] Changing mythtv resolution to match HDTV output?

Jarod Wilson jarod at wilsonet.com
Wed Jan 18 00:44:46 UTC 2006


On Thursday 12 January 2006 16:05, Steve Adeff wrote:
> On Thursday 12 January 2006 18:15, Michael T. Dean wrote:
> > Paul Leppert wrote:
> > > I recently purchased a new TV with 1080p capabilities (HP md5880n) and
> > > was looking for advice on how to set up mythtv to get the best image /
> > > performance at the HDTV resolutions.
> > >
> > > Based on the capabilities of the TV, I can feed it a 480p, 720p, and
> > > 1080p signal (and I'm assuming a 1080i signal as well, but not sure if
> > > that is relevant).  I have a DVI to HDMI cable to feed it and have
> > > confirmed I can send these three resolutions from my nVidia FX 6800
> > > (mythtv box).
> > >
> > > Based on my understanding of mythtv, I have the option of setting it
> > > up to use different resolutions based on what is being played back and
> > > another resolution for the GUI.
> > >
> > > I would assume this would work out as:
> > >     1080i source -> 1080p output to TV
> > >     720p source -> 720p output
> > >     480i source -> 480p output
> > >     GUI -> 1080p output (probably doesn't matter much which resolution
> > > to use for this)
> > >
> > > Is this how people use this capability?
> > >
> > > Is it better to have mythtv feed different resolutions to the TV based
> > > on the source being played (and have the TV scale), or is it better to
> > > have mythtv feed the highest resolution always (with mythtv scaling)?
> > >
> > > I have heard via this list that having mythtv feed a different
> > > resolution (than the source content) will impact the performance since
> > > the myth box will need to scale the image if it isn't the same
> > > resolution.  I have an Athlon XP 3200+ and it has problems keeping up
> > > with HDTV (if I don't use XvMC, which I would prefer not to use), so
> > > CPU performance is probably my top concern. Does the CPU perform the
> > > scaling or does the video card?  Anyone have any ideas on quantifying
> > > the impact?
> >
> > On any video card that has hardware scaling capabilities, scaling takes
> > almost no CPU resources.  Your card does hardware scaling when using Xv,
> > so you shouldn't notice any difference whether scaling on the Myth box
> > or the TV.
> >
> > Mike
>
> recommended to play everything out of the computer to the highest
> resolution your TV handles natively. The MythTV Menu can be whatever you
> find looks best to your eyes, text, etc. will behave differently at
> different sizes.

+1 for letting the TV run at its native resolution. (I just run everything at 
1080p on my Westinghouse set).

-- 
Jarod Wilson
jarod at wilsonet.com
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