Well... If you select 'Create Snaps' under an emulator, a box should pop up in the top left. You then go from 'Uncompressed Frames' to whichever codec you intend to use. As I previously stated, I use DivX. However, this only works for emulators. If you have MAMEFX in place of Vanilla MAME, the create videos option takes MNG movies, and you'll need to put in Vanilla MAME or MAME32 to take mng snaps and then switch back when you're done. The mnger only works for me with official MAME builds. Hope that helps!