Mpegs in Premiere
Mpeg is designed for distribution, not for editing. It incorporates a lossy compression method to reduce file sizes dramatically. Frame by frame information is not stored in the file -- only information on pixels that change between reference frames is stored. So, when you want to edit a particular frame, the actual video data may not exist for that frame, so the edit line "sticks" to the closest reference frame (where full frame video information is stored).
Did you actually record the seminar in Mpeg format? If so, you will have quality problems that editing will not help improve. Check out the free program Virtual Dub - (find it through Google) this may help you transcode the Mpeg into avi that you may be able to edit more successfully.
Good luck,
Chris
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