[mythtv-users] Mythfrontend idle cpu consumption help
Brian J. Murrell
brian at interlinx.bc.ca
Wed Nov 11 19:18:25 UTC 2009
On Wed, 2009-11-11 at 14:03 -0500, Michael T. Dean wrote:
> All existing 4:3 themes have a native resolution of 800x600, so 800x600
> is /not/ scaled up.
I'm not referring to the theme/UI bits but the actual content being
recorded and played back. That is afterall, the point of all of this,
yes? :-) HD-aside, the content is being recorded at somewhere between
480-720 pixels wide by 480 pixels high. 640 on the horizontal plane is
a nice happy medium value between those.
> Whether it's scaled /from/ 800x600 down to 640x480 by Myth, or not
> scaled and rendered at the native 800x600 resolution by Myth, the TV
> encoder will sample the resultant image to create an analog signal to
> send via the TV out.
Right. But again, I'm talking about the scaling up of 640x480 recorded
content to 800x600 because that's what the UI/X-server are configured
to, only to have it scaled back down by the tv-encoder for the 480 lines
of vertical output available in SD.
> And, likely, based on the way the TV encoders work (assuming you're
> using S-Video/Composite output), you'll actually get better quality at
> 800x600 or 1024x768 than you would get at 640x480.
Interesting. I will try this and see if I see any difference on my 32"
tube TV. If I were going to use a higher resolution than my TV and SD
signal (and therefore recorded content) provide me, I think I would want
to use the "separate video modes for playback" option to reduce the
screen at 640x480 for content playback to avoid the up and down scaling
of the content.
> Most importantly, however, there have actually been users who said that
> when they use the theme's native resolution (800x600 for 4:3 themes),
> they do /not/ get the excessive CPU usage.
They might not have an Athlon 800 for their FE/BE. :-)
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