Apple computer and video file Compatibility

I have encountered a problem playing videos purchased starting a few months ago.
It appears that poor play back is a result of my CPU being less than a 1.0 GHz, a newly stated minimum requirement, I think came with iTunes 7.
It appears to me that the only reason cpu speed, would impact play back is that iTunes has designed this effect into the files. This does not make sense to me and I am at a loss as to why they would do that.
I have found that closing all applications and playing in Quicktime, works for now on my PB 867.
However, I have no faith however that the next version of iTunes, or Quicktime or the downloaded files will not have a newly introduced "feature", again causing Apple to say that you must "simply" upgrade your computer.
Buying into iTunes really does make you vulnerable on several fronts to the whims of Apple and requires a huge amount of wishful thinking and trust that what works today will not be made un workable tomorrow.
A painful realization and addition to the negative column as I weigh purchasing a new computer for my mother, much less able to sort these things out.
It would be nice if someone has some information that could shed a different light on this circumstance.
Cheers

It appears to me that the only reason cpu speed, would impact play back is that iTunes has designed this effect into the files.
No, they didn't, at least not as part of some sort of deliberate effort to get you to upgrade. Videos and movies from the iTunes Store are encoded with the new H.264 codec. This codec can yield much better quality at a lower file size than can other video codecs such as the most common MPEG-2, but decoding H.264 takes more processing power. Hence the minimum CPU requirement; it just takes that fast a system to decode the content smoothly. In some cases with a system with close specs, you may be able to get adequate playback if all other applications and processes are shut down (as with iTunes vs. QuickTime; iTunes takes up a bit more of the processor for it's other functions), but it's always going to be iffy if you're right at the edge of the system requirements.
You're going to see this sort of thing on any computer system; better quality video requires higher-power systems, no matter what platform you're running on (Windows Media Player recommends 1.5Ghz).
Message was edited by: Dave Sawyer

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