Greetings!
Still a rank amateur, and a frustrated one because the Encoder when it burns a DVD for me (with no bells or whistles) adds a zoom-in to the cross dissolves that perform very happily in my cs5 sequence and in my H264.
When I burn a DVD from an imported sequence (or from an imported H264), the resulting DVD upon playback actually expands the viewing rectangle briefly which looks like a zoom out and then starts my zoom-in late.