I use Frame Shots too. Copy the code below into a text file and save it as make_thumbnails.bat or whatever you want and it will create 8 screenshots for every movie file in the directory that the batch file is run in. I usually make 8 and keep the best one for each movie as sometimes they're blurry or just dont represent whats going on in the clip very well. Anyway
Code:
FOR /F %%a IN ('dir *.mpeg *.avi *.mpg *.wmv /b') DO frameshots -thumbs 8 -cropthumb -width 320 -height 200 -trimthumb %%a ..\thumbs
That's the code for the batch file, pretty self explainitory. You also need to add the path to the frameshots.exe file in your PATH environment variable by right clicking on 'My Computer', go to the advanced tab, down at the bottom click the 'Environment Variables', in the 'System variables' section, find Path, edit it, add ";C:\Program Files\Frame Shots" to the end of what's already there ( note the semicolon, and DONT delete what is there already ) and you might have to reboot. After that though, simply copy your batch file into a folder that contains movies you want to make screenshots of and double click it. It'll save them to ..\thumbs, change to whatever you want. See the website for more info reguarding the various options you can pass to the exe.