need help wiith the TMPGEnc 4.0 XPress

屁屁zzz

can anyone please help me with the TMPGEnc 4.0 XPress,when i covert the rmvb to mpg, the files are so big,how can i size it down.tvb now,tvbnow,bttvb" L; Y1 g5 X; m
thank you so much!!!