Cant play High Definition movies

My mac cant play high definition movies. Even when i open Front Row somewhere in the first minutes the screen goes black but i can hear the movie playing. if i try to open the file from another player it may play the first minutes but it will shut the program down in the middle of the movie... : (

I found on my old system, processor speed is vital to be able to play HD movies/clips.
for example, on my dual 1.42/2gb/128mb video card, I could not play HD content over 720p.
If I tried to play 1080 clips, both processors would peg, I would hear the audio, but the video was either stop motion, or, like yours, blank.
720 worked fine.

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    A. No, DVDs are standard definition by design. They must be composed of mpeg2 video with a resolution of 720x480 (NTSC) or 720x576 (PAL). DVD players will only play actual DVDs.
    *Q3. Is there any way to make a DVD look as good as my HD video looks?*
    A. No. You can make it look very good by encoding it with the highest quality, but it will always be standard definition. This will probably look noticeably worse than your source footage if it is high definition.
    *Q4. Isn't HD-DVD a high definition DVD?*
    A. No, it is a specific term referring to a format backed by Toshiba. It lost a format war to Blu-ray. To burn and play an HD-DVD, you need a special burner and special player. Although it is a dead format, some find it useful and inexpensive to buy an HD-DVD burner and HD-DVD player.
    *Q5. Can I make a Blu-ray DVD?*
    A. No, there is no such thing; Blu-ray discs are not DVDs. They will not play in a DVD player even though the discs look physically the same.
    *Q6. Can I make Blu-ray discs (BD) on the Mac so that I can see my video in high definition?*
    A. Yes. You need a Blu-ray burner and Blu-ray discs. You also need to encode and author the discs.
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