[mythtv-users] Scale down HDTV to 420p easier or harder on system?

Scott D. Davilla davilla at 4pi.com
Wed Jan 30 18:01:43 UTC 2008

>I'm looking at getting a HDHomeRun box to get local ATSC channels in 
>better quality, however, my TV is currently setup as a 720x420p 
>monitor over DVI. Is it going to be harder on my system to down 
>scale the video and play at 420p or just straight out decode and 
>play at 1080i?

My experience is the scaling to the display size is nothing compared 
to the actual mepg2 decode. I see no difference in cpu usage when 
displaying 1080i mpeg2 HD content on 480i, 480p, 720p or 1080i 
display sizes. This is also 1080i content from a HDHomeRun using 
local of-the-air ATSC channels.

Get your xvmc working first (if glxgears does not work, nothing else 
will ether), then turn to getting your mythfrontend configured.

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