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Re: Export MPEG-2 without recompression

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Re: Export MPEG-2 without recompression
by Koby Goldberg on Jul 6, 2009 at 4:38:09 pm

Hi Tim,
Thank you very much for the explanation.

However from what I know the GOP size doesn't have to be constant... it can change in the course of the DVD. This way commercial DVDs are made to achieve best quality: usualy each new scene (or camera cut) is starting a new GOP (with an I-frame).
Therefore in the example you gave, the first new 10 frames can create a GOP, the next 15 frames would be the second GOP (changed from the original because of the fade and would have to recompress), and the rest of the video could stay the same with it's original GOPs.

Moreover, I know it is possible because with an old MainConcept version (in PPRO CS2) I did it! I am not dreaming... :) I realy did it. The export ran very fast on footage that didn't change, and slowed down to render and recompress parts of the video that were added or changed. The time was 10:1 than the original video (if the video was 10min, the export to MPEG2 took about 1min), and that was on an older computer, so it could not have been a compression...

Koby.


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