Grey Artifact Frames at beginning of YouTube movie

Hi,
I have uploaded (Share to YouTube) several movies to YouTube without problem but this one is causing me a horrible problem.
Whatever I do I'm getting horrible grey artifact frames for the first second or two when playing back the movie in YouTube. Then it all runs as expected.
I've searched this forum and YouTube forum and others have had the same problem but nobody seems to have an answer. Some say it's to do with H.264 and some seem to think it's something to do with keyframes. I'm at a loss. Any help much appreciated.
Bob.

Hi
Have no real answer but one observation.
138 minutes
There are a limit in iDVD
60 minutes per SL DVD - or -
120 minutes
Depending on encoding qvuality selected
I use Pro-Quality = 120 Max on SL-DVDs
Yours Bengt W

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Grey Artifact Frames at beginning of YouTube movie

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