AVS - AviSynth Script File is a very useful script that was made for use in AviSynth, which is a video production toolkit that is meant for the editing and rendering of many different types of video files. This file type is typically used in order to better automate video functions like cutting, resizing, dubbing and changing brightness settings. AviSynth as a program is actually distributed as a small DLL file and this helps it to act as a frameserver for the serving of video frames to media players on demand. This means that the player in question will be able to recognize the served frames themselves as normal AVI data files. In turn, playing video with AviSynth involves creating a new script and opening it with a supporting player.