IMovie mp4 problem - Video "flashes" pixels?

Hi!
After exporting, this mp4 file keeps "flashing pixels" time to time. Here is a sample of the problem:
http://www.youtube.com/watch?v=tnpqjaaKdz0

That looks to me like bitrate starvation -- too low of a bitrate for something that vivid and detailed?
What is this shot with? What's your original footage bitrate?
When you export to Quicktime, did you choose H.264 and at best quality already?!?
iMovie 11 H.264 is good, but can be a bit lacking in terms of quality compared to some of the best H.264 encoders out there.
I personally don't use H.264 and prefer to export either uncompressed or DV stream and use the power of my Quad PC to encode to better quality H.264.

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