What you’re asking for is done in Compressor by using VBR encoding and adjusting the keyframes. Read up on the subject in Compressor help or the manual if you have it. However, often using VBR encoding causes the issues you might be having and CBR encoding is actually the cure.
David Roth Weiss
Director/Editor/Colorist
David Weiss Productions, Inc.
Los Angeles
http://www.drwfilms.com
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A forum host of Creative COW’s Business & Marketing and Apple Final Cut Pro forums. Formerly host of the Apple Final Cut Basics, Indie Film & Documentary, and Film History & Appreciations forums.