[mythtv-users] dumb hdtv questions
Cory Papenfuss
papenfuss at juneau.me.vt.edu
Wed Mar 23 19:24:17 UTC 2005
> It's the high resolution. Also 1080i is harder to play than 720p not
> just because the high resolution but also because most people like to
> deinterlace it on progressive displays.
>
Just from a raw pixel rate you've got this:
Signal Resolution Pixels Relative pixelrate
NTSC: 720x480 at 30Hz = 0.345Mpixel at 30Hz = 1:1 (480i)
480p: 720x480 at 60Hz = 0.345Mpixel at 60Hz = 2:1
540p: 960x540 at 60Hz = 0.518Mpixel at 60Hz = 3:1
720p: 1280x720 at 60Hz = 0.912Mpixel at 60Hz = 5.3:1
1080i: 1920 at 1080@30Hz = 2.074Mpixel at 30Hz = 6:1
1080p: 1920 at 1080@60Hz = 2.074Mpixel at 60Hz = 12:1
Figure it takes a 450MHz machine to play SDTV DVD. Multiply by 6
to get 1080i HDTV and you get 2.8GHz machine. Grossly inaccurate due to a
multitude of reasons, and oversimplified, but it gives you a ballpark
figure of how many more pixels need to be calculated compared to SDTV
(480i).
-Cory
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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