I have a client who needs the FCP movie I have edited for him to be compressed to an mpeg file and under 4gb. Right now the FCP file is 4.13GB. Knowing nothing really about compression rates. Would someone be able to recommend an MPEG rate that would get my movie below 4.13?
How is your client going to use the mpeg? I'm assuming it's mpeg2. That can be used for a DVD at lowish data rates (under 7mbps), or it might be a transport or program stream for broadcast which would be 17 to 25mbps. You'll have no problems shrinking the size with mpeg. The issue is more about quality than size unless it's for DVD. Then, you'll be safely under 4GB regardless. Here's a great little data/space calculator app from Digital Heaven called VideoSpace. It's free.
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