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I question makers of this software about the small output size and low VBR....they say their emphasis is on quality of output and not just filling up a DVD with meaningless data....
Here is their email back to me:
The source you use is (as a DivX) probably heavily compressed. So, the images, when decompressed are heavily correlated, to use simple words, very efficiently compressible. So, the bitrate we have is lower than the average bitrate because the engine managed to compress perfectly the video without the need of more bits. Our design choice is (unlike all the different commercial encoders we've seen) to avoid putting stuffing bits just for the sake of reaching the average bitrate. We commonly experience a bitrate that is equal to twice the bitrate of the source - make us consider the original video compression format is twice as efficient as the MPEG2 Video DVD compression format. So for a 1200 kbps Divx, you'll have usually an output bitrate of 2400-2500 kbps in divxtodvd. This is why divxtodvd is the only solution able to store more than 4 hours of video into a 4.5 Gb. DVD, without losses compared to the original Divx. The average bitrate is in fact the maximum average value which will allow to make the full segment(s) fit onto a dvd. 99% of the time, the real bitrate is much much lower, but without inpact on the output quality.
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