Offtopic:
720p requires a minimum of 1,7 GHz CPU to play. As for the bitrate, most of today DVD drives can support this speed.
1080i are the most common among pi___es and are the source for further "so called" 720p files. Why "so called" ? Because, by definition 720p plays at 47,952-60 fps and most of the files are at 23,976 fps. And 1080i MPEG2 files play OK on my computer (2,53 GHz Celeron) using Elecard's software deinterlacing MPEG2 decoder. DOn't know about 1080i H264 files. Never had one.
It is wrong to associate matroska with HD files, but it's 99 % sure.
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