I need an uncompressed raw data, since i'm going to be doing lot of post processing in finalcut express. I don't need to compress the video in H.264 just yet.
Which uncompressed format does Snapz Pro use. or is their a way i can use a high bitrate MPEG2.

Hello-
In the video settings of the save movie dialog you can select None as the compressor and it will save it as an uncompressed .mov file.

Never, ever, ever, ever save video with no codec. Uncompressed video is insanely large, unwieldly, and generally just sucks to work with. It's also nearly impossible to archive that much data, unless your funds are inexhaustible.

My recommendation is to use the Pixlet codec. Pixlet was specifically designed as a high end, high resolution video codec for professional film makers - it is a loss-less codec. Another good codec is the Apple Intermediate Codec, which offers comparable quality to Pixlet and even better compression.

To illustrate just how important compression is, a one minute capture of the iTunes Visualizer is 2.68GB uncompressed. Using Pixlet at the best quality setting, which produces video that is the same quality as if it were uncompressed, results in a drastically smaller 196.91MB file. AIC, which is nearly loss-less, produces a video that is a mere 138.8MB in size.

Now, if you have plenty of disk space, you may be thinking that this doesn't apply to you. Wrong. The bigger the file is, the longer it'll take to render effects to and the harder it is to scrub through. All that extra data means your hard drive - the real bottle neck in digital video environments - has to work a lot harder. It also takes about about ten times as long to save the file after you're done recording in Snapz.

In a nut shell, you're shooting yourself in the foot by trying to use uncompressed video.