Episode Pro - Changes in BitRate not changing file size...

Hi,

I've been trying to use Epsiode Pro to compress MPEG-2 video for DVD.

In the past I've used Apple's Compressor with a maximum bit rate of 7.4 and an average rate of 6.5. This gave me a file size of about 3.9GB. This allowed me to fit an 83min video on DVD along with .ac3 audio.

I tried the same settings in Episode Pro, but the resulting file size was 4.3GB, and DVDSP choked saying "Bit Rate Too High"
So I tried experiementing with the settings in Episode, lowering the max and average bit rate, all the way down to 6900 max and 6000 average.

BUT ALL THE SETTINGS PRODUCED THE EXACT SAME SIZE .m2v FILE !!!!!

I tried this again with a shorter clip and got the same results. I even tried using the Quality based encoder settings at 100% and 90% and those gave me the same size file as well.

Any ideas ?