I have a few questions regarding file formats and the process of editing in Premiere.
I have been using Premiere for about 2 years now for basic home video editing. In that time I have only worked with AVIs that were created by capturing from a camcorder. I originally used to output editied video back to tape, but more recently I have been authoring DVDs.
I recall a time (long ago) when a friend of mine asked me to edit a short MPEG file (7 min long) down to about 4 min. I tried to import into Premiere 6.0 (or maybe it was Studio DV, I can't recall) but it would not allow it. I had to convert it to AVI first, then import and edit it, and then reconvert to MPEG.
I have since upgraded to Premiere 6.5 and am coming across this issue again. It seems Premiere now allows you to import an MPEG and drop it into the timeline. As I mentioned above, I'm not sure if this was permitted in Premiere 6.0. But this is where it gets confusing for me.
My understanding of an AVI file is that it consists of still frames (29.97 fps) and each frame has a audio component associated with it. My understanding of an MPEG is that it is like an AVI, but with lots of frames (those that are very similar to its neighboring frames) removed, and those frames that were not removed have references made to them by the absent frames (which contain information on how each absent frame differes from a real frame). Would this description be extremely high-level and accurate?
If so, I don't see how editing an MPEG works in Premiere. When you drop it in the time line, how does it work? Are the "frames" that reference real frames reconstructed so that it appears that its an AVI? Is there a FAQ or tutorial on this?
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MPEG1/2 are not created to be edited. That's my understanding. I think it's mainly because the I, P , B frame thing. There is only one I frame in 12-15 frames that makes frame-accurate editing very difficult. Not to mention the time stamp and video\audio header stuff. So if you have a MPEG clip, take as what it is. Maybe a little cut here and there. There is much you can do beyond that. Premiere is designed to deal with raw AVIs, not MPEGs.
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