CS4: Graph Editor video Tutorials?

Hi All,
I've been looking for intermediate/advanced video tutorials for the Graph Editor in AE, particularly in how it applies to Time Remapping. There's a few things out there but they seem to be very basic, includng the stuff from Lynda.com. Mostly for use with Time Remapping, I want to learn the Graph Editor inside and out. Anyone know of any good sources? Thanks.

Thank you for the useful link. The motion aspect of the Graph Editor is very straight forward, much like the graph editor in Lightwave. It is when editing time remapping keyframes in the Graph Editor where things can be somewhat unpredictable or counterintuitive. For example: a 1 minute video clip. I may want to speed up and slow down different portions of the clip while leaving other portions unchanged.
It took me a while to figure out what was going on with time remapping. In order for the net length of the video clip to remain the same, if you speed up a portion of the clip, then other portions of the clip must necessarily expand (slow down) so the overall length of the clip is the same. However this may be an unwanted byproduct.
For instance, Let's say I have a video clip of exactly 30 seconds. I want to slow down the middle 10 seconds. So I set a time keyframe at 10 seconds (keyframe 1) and a time keyframe at 20 seconds (keyframe 2). I now move keyframe 1 back to the 5 second mark, and keyframe 2 forward to the 25 second mark. That portion of the video (between 5 and 25 seconds) now plays slowly as expect. However the first and last 5 seconds of the video are now playing quickly, because as we can see in the Graph Editor, the speed of the first and last 5 seconds have been moved up, or "squashed" to accomodate the slower, middle section of the time remapped video. I hope I'm being clear.
The only way I've found to correct this is to first allot more overall time for the clip in Composition Settings, and then extend the tail (and/or the beginning) of the video clip. Then keyframe 1 must be selected with keyframe 0 (the first keyframe added by enabling Time Remapping) and moved back together, and keyframe 2 must be selected with last keyframe and moved together as well. As a result, the beginning and ending 5 seconds of the clip will now play at the proper, normal speed.
The process can get more complex, though, when time remapping a much longer clip, where numerous time remapping transitions will be occurring. Is the only solution to split up the clip, do the time remapping on the now several existing layers, and then move everything around until it looks fluid?
I may be missing something, but it seems to me that there should be some sort of "intelligent" feature added to Time Remapping that could recognize unchanged portions of a clip, and expand the time settings of the project, etc. to automatically accomodate for this.

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CS4: Graph Editor video Tutorials?

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