Can't get Quicktime HD movie files to run smoothly on my iMac G3

I've got a slot loading imac crt/ G3 933mhz 596mb of ram; and updated it to tiger and quicktime 7 pro. Everything was fine. I marvelled at HD quicktime movies and videos in iTunes, but all of a sudden, any new hd files I download from iTunes or the quicktime site won't play smoothly. I found a shockwave file doing the same thing. It's as if my broadband has suddenly gone 56k. I know this isn't the case because I plugged my laptop in to the modem and it's fine. Has anyone else had a similar problem. Perhaps my processor and graphics card can't handle the latest quicktime software. The problem doesn't happen with audio files, and also stll happens to video files after they've completed downloading. The puzzling thing is it was fine until I tried to view previews and trailers in the iTunes store.

Newer H.264 encoded video requires more computer power (and a good video card).
Our G3 machines just can't keep up. Even most of Tiger's "eye candy" will not display on your G3.
Avoid QuickTime content that says "HD" in its name or uses H.264 video. Nothing is wrong with your older iMac. It's just under powered.

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Both the AVI and the MOV file extensions refer to the file container and not the compressed data the file contains. Both are generic file containers in that each may contain any valid combination of audio and/or video data that is compatible with the codec component configuration of the system on which the file was created. On the other hand, whether a file is playback compatible, conversion compatible, and/or edit compatible depends on the data actually contained in the file container. So, you are basically dealing with two separate issues here—the container and what is inside it.
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Background: AVI is a file container originally developed by Microsoft back in 1992 but for which official support was discontinued about 11 years. Despite its limitations, Windows users still tend to use this file based on its open source ease of use and generic nature, thus, making its use so popular that most users are unwilling to switch to more modern but less generic file types. Since some AVI legacy compression formats have never been transcoded for the Mac or use beyond OS 9 or OS X PPC platforms, it is often important to know what specific compression formats are contained in the AVI file to know which codecs to add to your system and which not to add in order to avoid possible codec conflicts.
You can use many different converters to convert AVI files to iMovie edit compatible files. Most third-party apps contain their own buit-in codecs which do not relay on the Mac codec component configuration. Free ones, like HandBrake, usually have limited conversion capabilities while those that have more varied outputs are usually commercial in nature and will cost you additional cash. QT 7 Pro or the free MPEG Streamclip app allow you to access you own system's component configuration and use any available codec component like DV, AIC, MPEG-4, H.264, Photo JPEG, etc.—all of which are iMovie compatible for editing purposes—but only after making the AVI file QT 7 player compatible.
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x

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I was just on a windows computer with some horsepower power. I can't get it, the video would play fine, but no audio. Perhaps Jon could take a look? I can't pick up anything on it, other than it's a .mov
I no longer have home access to a Windows machine or Mac running Windows OS. As I am not an HTML programmer, I did not check the page coding but had no problem playing any of the video content on the linked page using the Safari browser. Spot checked the source files and found them to be typical MPEG-4 AVC (H.264) files with a frame rate of 30 fps using CABAC entropy Main Profile Level 3.0 (SD) and Level 3.1 (HD) encodings in MOV file containers. As to audio, only one file—Video+(1).MOV (the "Raven, Salma and Kenneth" Claymation Practice file)—contained an AAC (LC) audio track. Except for the use of capitalized extensions (which I don't think should cause a problem), the videos themselves look standard and should be playable on any system using any compatible media or plug-in players that support standard MPEG-4 content and the MOV file container.
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You can get from Microsoft, the flip4mac free player. Since Windows Media Player for Mac is no longer supported, this is the way to go.
http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx
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