[Ffmpeg-devel] size of encoded file not continous parameter of 'vqscale'

Darko Veberic darko.veberic
Fri Jun 9 13:02:09 CEST 2006


i am usually encoding video with the following mencoder options:
-lavcopts vcodec=mpeg4:vqscale=$vq:vhq:v4mv:trell:autoaspect:threads=4

i have observed strange non-continuous behavior of the resulting file
size with respect to the vbr quality parameter $vq.

for example, the file size for vq=4.49 is 911M and for vq=792M (while
keeping the audio settings constant). i have noticed the jumps occur
around the x.5 values for the vbr quality... in such cases it is almost
impossible to get the file size right (ie, close to 700M)...

is this a bug (or a feature) ?


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