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Actually I think they are the same problem, that is the large GOPs are the result of field (vs frame) encoding for high motion, but I have no examples.
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I can't confirm that. Oversized GOPs occur also at low motion and even still scenes. And they do not always occur in the same scenes.
In my example, with 80 king of queens episodes, sometimes the intro has no oversized gops at all, and sometimes it has one or two. And the intro is always the same.
On the other hand, you can encode field based MPEG streams with max. 30 fields in a GOP.
The Geek