![]() Well mpeg does have still images (a keyframe or I-frame) and then it stores the changes between that still image and the next frame. You know how cine film is a series of still images played one after the other. The reason for all this is to do with the way mpeg holds video. If you put your 'cursor' on a keyframe, and mark it as the A-point, avidemux deletes from-and-including the A-point. The reason for the frame advance is that the last frame must be a keyframe (or avidemux complains).
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