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

What is avisynth?

AviSynth is a powerful tool for video post-production. It provides ways of editing and processing videos. AviSynth works as a frameserver, providing instant editing without the need for temporary files. avisynth itself does not provide a graphical user interface (GUI), but instead relies on a script system that allows advanced non-linear editing. While this 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, and complex filters can be created from basic operations to develop a sophisticated palette of useful and unique effects.

avisynth is free open-source software, and licensed under the GNU General Public License GPLv2.

New to avisynth – Start Here

Your first script – A guide for total newbies.

Getting started – An introductory guide.

Grammar – An introduction to the avisynth scripting language.

Filter introduction – An introductory guide to most common avisynth filters.

Script examples – Putting everything together in the real world.

avisynth FAQ – Answers to many common problems.

More information (How does it work? When is it useful? Why no GUI? What applications work well with avisynth?)

Guides – Guides explaining the basics, tips on specific conversion types and common tasks.

Troubleshooting your scripts and configuration.

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.

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.

Internal functions – General purpose functions for math, logic etc.

Clip properties – Properties such as Width, Height, Framerate etc.

Control structures – Language constructs for script flow control.

User defined script functions – How to define and use them in scripts.

Plugins – How to load them (avisynth, VirtualDub, VFAPI and C-plugins); autoloading and name-precedence explained. Most External filters are plugins; the rest are regular scripts.

Runtime environment – Scripting on a per-clip frame basis.

Filters and Utilities

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.

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.

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