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: [EMAIL PROTECTED] = [EMAIL PROTECTED] = 1:1 (480i) 480p: [EMAIL PROTECTED] = [EMAIL PROTECTED] = 2:1 540p: [EMAIL PROTECTED] = [EMAIL PROTECTED] = 3:1 720p: [EMAIL PROTECTED] = [EMAIL PROTECTED] = 5.3:1 1080i: [EMAIL PROTECTED]@30Hz = [EMAIL PROTECTED] = 6:1 1080p: [EMAIL PROTECTED]@60Hz = [EMAIL PROTECTED] = 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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