This tool quickly counts the remained space of AVI file from inserted variables. The output number is OK to insert to DivX encoding settings panel. It can also tell you if the video quality will worth it.
I tried this one. Wanted to put several videos on one dvd and make nice autorun but failed. I get no buttons, only windows with filenames and not clicable. Something I did wrong or something not working right. I strictly followed instructions but no go.