Compressor causing serious pixelation

Hi,
I've been using the same set up of FCP/Compressor/DVDSP for years with no real problem.
When I finish a timeline, I export the entire timeline as a Quicktime movie, import it back and then use compressor to prep it for DVDSP. I do this because I am more comfortable compressing a flattened movie (as opposed to a time line with a million edits) and I believe it make the Compression goes quicker. I always keep my movies less than 90 minutes and use Compressors - DVD Best Quality 90 Min setting.
All of a sudden out of the blue, after creating a DVD (using DVDSP) about half way through my latest movie, there is about 30 seconds of crazy pixelation. It looks as if every 3 seconds, the image loses and then regains focus.
I've spent two entire days trouble shooting with no luck.
• It's not the specific footage because when I swap the problem footage with new footage, the new segment is affected.
• The movie that is created by FCP has no hint of the pixelation whatsoever - it looks perfect.
• It's not the burner, because when I view the movie directly from the disc image created by DVDSP, the pixelation problem is there.
• Trashing FCP Prefs did nothing
I'm using:
•MacPro 2 X 3 Dual Core
•11GB RAM
• FCP 6.0.6 - the problem started on 6.0.5 and I was hoping that it would be fixec if I updated to 6.0.6, but did not
• Compressor 3.0.5
• DVD SP 4.2.1
Message was edited by: Daniel Sass

I had a similar issue a while back that had something to do with the long GOP used in the video files.
I followed the suggestions here and it fixed my issue:
"Since it seemed to be pulsing at the same rate as the I-frame occurs in MPEG, I decided it had something to do with MPEG stream. Basically, in a dark scene there was more noise in the video than in a scene well lit. That noise translates into more pixel changes between frames and more data generated by Compressor in each MPEG group of pictures. So I just reduced the average bit rate from the 6.8 Mbps that I had to 6.5 Mbps, and the maximum bit rate from 8.0 Mbps to 7.7 Mbps, which permanently fixed the problem. Depending upon your particular situation, you may want to set them even lower as I've seen recommendations as low as 5.5Mbps average/7.2Mbps maximum."
I also found this if the above doesn't work:
http://discussions.apple.com/thread.jspa?messageID=8350784
James
Message was edited by: MacCodeSmith

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