before converting, have a look here
http://www.mympxplayer.org/using-vir...ons-vt805.html
look at the properties of the video file you are converting, if it is 29fps, then use medium fps setting while converting it.
if it is 25fps, then use high/low fps setting while converting.
also what was your other problem? do you dont know how to change the fps setting or is it greyed out in the amv converter.
I would recommend you to tick the 'Try Other Codec' option if you have a codec pack installed. if you dont then its highly recommended you do from the download section.
Other setting i would recommend are:
1. fps according to what i told you above.
2. image quality - medium
3. focus : mode 0