DIVX - what bitrate ??

[tim2k]

Does anybody know how to calculate the exact bitrate of the audio/video when encoding to DIVX ?? I have a program which does it , but you cant specify the output resolution...so i cant use it....I wanna make a file that fits on a cd (74 or 80) so I have to knwo the best settings up front.....rather than figuring it out afterwards.....

Tim.