iPod why the change in size???

I have ripped several episodes of family guy to ipod format...most of them are about 37-43mb, but only a few of them are 100-120mb...why has it changed so much? I looked over the "get info" options and tried to compare the files...i couldn't find anything different, and they all play on my ipod just fine. Anyone know what is going on here? trying to conserve hard drive space..

thanks,
retard

Counterfit said:

Are they all encoded with the same options?

Click to expand...

as far as i can tell they are...unless i'm missing something, but i doubt that....they are:
mpeg-4 video file
127 kps