Video cutting saves memory in After Effects CS4?

I'm working on this project, and I have a bunch of large video files.  If I cut the video within the composition, which saves memory send me things more RAM Preview or speed upward? Or would you say it cuts before you import it into the composition. I'm worried that if I cut the video before importing it, maybe use VirtualDub or AfterEffects himself, I'd lose quality?

The clip was recorded using Fraps in 'full-screen' mode, and I will be output using After Effects to 1280 x 720 pixels. I need to keep the quality so that people can view them later on Youtube in HD.  It is a composition of 6 min.

The problem is that the files are very large, a film of 2 min 30 sec being about 3 GB, and I'm not getting RAM Preview more than maybe 5-6 seconds now because the number of files in the composition (most of them will be used). I've even enabled multiprocessor and increased memory paging file. I was even using an 4 GB with Windows ReadyBoost flash drive.

Composition settings:

Screening: HDV/HDTV 720 29.97 (this is the correct setting if I want to display in Youtube HD)?

Durating: 6 minutes

PC: I have 4 GB of RAM on my system.

Total files: about 20 GB, 190 files.

There is another question, I really need to crop the bottom/top part of the clips. For now, I put on the scale clips to exclude parts down, that I don't need, but I was wondering if I should have trimmed before you import them to the project. Which would give me probably longer RAM Preview, but then if I cropped the clips dimensions beforehand they would lose quality? (Once again, done using AE4 or VirtualDub)

Any help is appreciated

> If I cut the video within the composition, which saves memory send me things more RAM Preview or speed upward?

What exactly do you mean by 'trim '? Are you referring to the shortening of the duration of the video in the source file? This has nothing to do with the RAM Preview.

> I don't get preview RAM more than maybe 5-6 seconds now because of the number of files in the composition (most of them will be used).

The number of files used as source for a composition are not relevant to the length of RAM Preview, either.

> I even turned on the multiprocessor option...

Don't, don't.

You only have 4 GB of RAM. It is not enough to use the feature of multiprocessing made simultaneous multiple images.

In addition, by using this feature, you dedicate RAM for the rendering process of the Fund, which subtracts the RAM that is available for the duration of RAM Preview.

You have very little RAM, so your RAM Preview times are not going to be great. See this FAQ entry for some mitigation advice this:

http://forums.Adobe.com/thread/424030

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