On Wed, 15 Jun 2005, Steven M. Schultz wrote: > mpeg2enc -D 10 -G 15 -b 6400 -c --dualprime-mpeg2 -E -10 -f 8 -q 2 -K > tmpgenc -4 1 -2 1 -o $N.m2v > ---------------------- > > Hardly seems worth the cpu cycles to do the telecine removal. > > Anyone care to guess why encoding 20% fewer frames gives the same file > size as encoding all of the frames?
You are specifying a bitrate of 6400 bits per SECOND. Not bits per frame. Same number of seconds, same bitrate, so the encoder will try to produce a file with the same size. If you look at the Q values used, the second encode at 24fps should be using lower (better) Q values than the first one, because you gave it more bits to spend on each frame. Also keep in mind that the 20% of frames that you removed are the easiest 20% to compress, because they are exactly like the ones that came before them. ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
