It is a powerful software that provides different means of editing videos. It works as a frame server, providing instant editing without the need for temporary files. AviSynth itself does not provide a graphical user interface (GUI) but instead depends on a script system that allows advanced non-linear editing.
Although it can process a wide variety of video and audio files, it depends on the codecs you have previously installed on your PC. Editing can be performed, though, without needing temporary files, which ensures a higher speed. AviSynth enjoys support from other programs, as well, such as VirtualDubMod or AVSGenie. These applications allow you to create scripts and to apply various filters and effects. While this may at first seem tedious and unintuitive, it is remarkably powerful and is an excellent way to manage projects in a precise, consistent, and reproducible manner.
It is a better choice, especially for professionals who need to process a large number of video files. The result is much faster with this piece of software than it would be by using applications which feature a GUI.
AviSynth is licensed as freeware for PC or laptop with Windows 32 bit and 64 bit operating system. It is in video editors category and is available to all software users as a free download.