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
- New features, backward compatible, native support for Unix-like OSes.
- Wiki page
- Homepage (avs-plus.net)
- Latest release (GitHub)
- Discussion at forum.doom9.org
- Deprecated Official builds
- v.2.6.0 ST, 32-bit at SourceForge
- Deprecated Unofficial builds
- v.2.6.0 MT, 32-bit, author SET
- Install—and quickly switch between—AviSynth versions:
- Avisynth 2.5.8, 2.6.0, 2.6.0 MT, 2.6.1 Alpha
- Avisynth+ 32-bit, 64-bit
- Get it here at forum.doom9.org
- Deprecated Multithread Version
- 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
AviSynth 2.5.8 running on Ubuntu 32/64.
- Known Issues in v2.58.
- Known Issues in v2.60.
The official reference documentation.
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:
- Shared functions – Commonly used script functions.
- Utilities – A list of GUIs, command-line, batch and other AviSynth related utilities.
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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AviSynth documentation is Copyright (c) 2002-2023 AviSynth developers and contributors.
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