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AviSynth FAQ | Internal filters | External filters | AviSynth Syntax | Sourceforge | Doom9 Forum

What is AviSynth?

• It is a powerful tool for video post-production. It provides ways of editing and processing videos.
• It is a frameserver to your other video programs, providing instant editing without the need for temporary files.
• It is a script system for video filters and advanced non-linear editing.

It's called AviSynth because it synthesizes a virtual Avi file, "generating video and audio data according to the script and feeding it to the application as needed." It is much more than that, though: to get an idea, take a quick glance at all the third-party plugins available. At the same time, it is much less: it's easy to create a quick script to solve some video problem.

AviSynth itself does not provide a graphical user interface (GUI). While scripting may at first seem tedious and unintuitive, it is remarkably powerful and is a very good way to manage projects in a precise, consistent, and reproducible manner. Because text-based scripts are human readable, projects are inherently self-documenting. The scripting language is simple yet powerful - basic filters can be combined to create useful and unique effects.

AviSynth is free open-source software, under the GNU General Public License GPLv2; see Copyrights.

New to AviSynth - Start Here Your first script - A guide for total newbies. Getting started - An introductory guide for getting started with AviSynth. Grammar - The grammar of AviSynth script language. An introduction to AviSynth scripting. Script examples - Assorted examples for putting everything together in the real world. Filter introduction - An introductory guide to most common AviSynth filters. Some guides explaining the basic possibilities of AviSynth: Analog Capture guide. The AviSynth part of the capture guide is about what filters can be used to enhance the quality of the capture. It discusses things like deinterlacing, denoising, cropping and resizing and color adjustment. Which makes it really useful to learn about some of the capabilities of AviSynth in a schematic way. AviSynth 101 mirror - A guide by l33tmeatwad, it includes mostly current information on software setup, video basics, importing videos, handling audio, using filters and other useful information. AviSynth Basics - another guide for beginners. Introduction AviSynth from AnimeMusicVideos.org. A basic guide about deinterlacing, resizing and some other basic stuff. Introduction basic AviSynth filters from AnimeMusicVideos.org. A basic guide about smoothers, rainbow removal, sharpeners, color adjustment and some other basic stuff. Troubleshooting your scripts and configuration. Read more about AviSynth (How does it work? When is it useful? Why no GUI? What applications work well with AviSynth?)	Download AviSynth Official builds v.2.6.0 ST, 32-bit at SourceForge Unofficial builds v.2.6.0 MT, 32-bit, author SET at forum.doom9.org Forks AviSynth+, 32-bit and 64-bit, author ultim at forum.doom9.org. Download: avs-plus.net | Wiki page: AviSynth+ AvxSynth: a Linux port of AviSynth AvxSynth is a native port of AviSynth 2.5.8 running on Ubuntu 32/64. Deprecated v.2.5.8 MT, 32-bit, author SET, discussion at forum.doom9.org v.2.5.8 MT, 64-bit, author SET, compiled by JoshyD at forum.doom9.org Bugs and issues Known Issues in v2.58. Known Issues in v2.60.
FAQ, Guides and Advanced topics AviSynth FAQ - Answers to many common problems. Aspect ratios explained - Introduction to aspect ratios (DAR, PAR, SAR), and how to use that for resizing your clip. Guides - Tips on specific conversion types and common tasks. Advanced Scripting Tips - Using recursion, weaving 3 clips, and other programming tips. Advanced topics - Chroma Upsampling Error, color conversions, hybrid video, motion compensation, and other advanced subjects. High bit-depth (Deep Color) support with AviSynth	Filters and Utilities Internal functions - Included non-clip functions to use in scripts. Internal filters - Included media filters, organized by category. External filters - Hundreds of separately downloadable filters, organized by category. User pages hosted on this site: AviSynth Filter Collection - Warpenterprises Fizick's AviSynth plugins vcmohan's Plugin Filters stickboy's AviSynth Stuff Shared functions - Commonly used script functions. Utilities - A list of GUIs, command-line, batch and other AviSynth related utilities.
Script Syntax The official reference documentation. AviSynth Syntax overview Script variables - How to declare and use them in scripts. Operators - Available operators and relative precedence. Clip properties - Functions that return a property of a clip. Control structures - Language constructs for script flow control. User defined script functions - How to define and use them in scripts. Plugins - How to load plugins (AviSynth, VirtualDub, VFAPI and C-plugins), autoloading and name-precedence. Runtime environment - Scripting on a per clip frame basis.	Coders Want to get involved? The official project. Learn how to compile AviSynth, AviSynth plugins and console applications that access AviSynth. Learn how to debug AviSynth, AviSynth plugins and console applications that access AviSynth. Filter SDK - AviSynth plugin programming tips. Avisynth Plugin Development in C - A tutorial to write a plugin with C. AviSynth Developer Forum The ongoing changelist. About the development of AviSynth v3 (which will be platform independent). References to image processing algorithms.
Scripting Reference Beyond scripting basics. Scripting reference overview The full AviSynth grammar - The AviSynth grammar revisited and explained in detail. The script execution model - The steps behind the scenes from the script to the final video clip output. The filter graph. Scope and lifetime of variables. Evaluation of runtime scripts. User functions - How to effectively write and invoke user defined script functions; common pitfalls to avoid; ways to organise your function collection and create libraries of functions, and many more. Block statements - Techniques and coding idioms for creating blocks of AviSynth script statements. Arrays - Using arrays (and array operators) for manipulating collections of data in a single step. Scripting at runtime - How to unravel the power of runtime filters and create complex runtime scripts that can perform interesting (and memory/speed efficient) editing/processing operations and effects.
About This Website We need your help to build and improve our site! Editing is easy! Please see Editing pages and Formatting. To port this site to another language, please see the MediaWiki Localisation Guide. Filter and script authors - please see Submit your Documentation on doom9.org.	Documentation Copyright AviSynth documentation is Copyright (c) 2002-2025 AviSynth developers and contributors. The contents of avisynth.org and avisynth.nl are released under the Creative Commons Attribution-ShareAlike 3.0 License (CC BY-SA 3.0).