Hi KYUSS!
Well in the case of avisynth import your "wanted" information is not really packshot based
As an avisynth input via Makeavis is a generic way to feed an encoder (no matter which one) who doesnt accept directly avs files.
So do open your avi in FitCD, determine you target size and safe that aviynth script generated by that appl.
Afterwards you can enter easely that script and add some filters etc.
I would like to suggest "directly" going into makeavis using Dialhots optimal script, but that one uses Gripfit and that filter is not compatible with Makeavis.
So do use Dialhots optimal script and change the Gripfit lines using the Resizing lines of the FitCD output.
Or use directly that FitCD outputted avs and convert that one using makeavis ... where you just go into packshot using that "resizing only containing" avs/AVI, where u use then the filters of mencoder in packshot.
Go into these Appl. an if you still end up with questions, just ask.
Inc.
EDIT: Uops!!! I didnt see that RDS also was in here ... I should update the "Visit last unread posts" button more often