[mythtv-users] 720p harder to decode than 1080i?

[Dan Wilga]

At 8:55 AM -0500 11/20/06, Mark Chang wrote:
>I am assuming 720p is harder to decode than 1080i? I ask because it
>turns out that my recently-built HDTV Myth box doesn't have enough
>horsepower to play back some OTA recorded streams.

Because of the interlacing, the data stream for 1080i consists of 
only 540 lines/frame, wheres 720p is truly 720 lines/frame. So 1080i 
actually contains less detail per frame than 720p. That would explain 
the difference in file size and processing requirements.
-- 
Dan Wilga                                                        "Ook."