AVI file size smaller that required

[stephane999]

Hi : here is the problem : I have made a 2-pass encoding with the latest (5.02) divx codec with FlaskMpeg/OpenDML avi output. The required bitrate was 1500kbps, but at the end of the 2nd pass, the file is smaller, i.e. in my case for a 2 hour film (video only, no sound), the file size should be approx. 1.5 Go, but the actual size is 0.98 Go. Did I miss something ?

Thanks for help

S.

[UncasMS]

no, i dont think you did something wrong here

depending on the length of your title, the resolution and resizer you used, the usage of b-frames etc. your avi might be much smaller than the desired size.

in that case case, however, it should still look perfectly fine (in case the avi is saturated already and wont need any additonal kb)

100min films with a lot of dark scenes for example will hardly become 1300mb in size

you could increase your filesize by NOT using b-frames (quality wont decrease of course!), using the highest resolution (i.e. 704 x XXX) and the sharpest resizer

[SHADO\\']

Play around with the quantitizers a little. Set Max at 10 or lower and see if this helps. I don't use Flask but if I get a movie that's more compressable than others I usually adjust the quants for more quality and still get the right file size. I prefer this over deactivating b-frames. Never had this problem with Autodivx 5 by Llemor.

[khp]

Originally posted by SHADO\\'
Play around with the quantitizers a little. Set Max at 10 or lower and see if this helps.

Lowering the max quantizer, in case of undersized files, generally won't improve the filesize prediction by more than a few mb, if at all.

When you get undersized files like stephane999 descripe, the average quantizer is usually very very close to the minimum quantizer, and the movie only contain a few, if any, frames that are not encoded at the minimum quantizer.