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


What is AviSynth?

  • It’s a powerful tool for video post-production.
  • It’s a frameserver, providing instant transfer to other video applications without the need for temporary files.
  • It’s a script system for non-linear editing and video filters and effects.

AviSynth itself does not provide a graphical user interface (GUI). While scripting may at first seem tedious and unintuitive, it 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. You have complete control of everything.

The scripting language is simple yet powerful – basic filters can be combined to create useful and unique effects. It is easy to create a quick script to solve some video problem. It can do much more than that, though: to get an idea, take a quick glance at all the third-party plugins available, or browse the doom9 forum to see what AviSynth users and developers are getting up to lately!

AviSynth takes its name from AVI, a digital media format, and Synthesis, because it creates (synthesizes) a virtual (in memory, not on disk) media file – “generating video and audio data according to the script and feeding it to the application as needed.” (in the words of its inventor, Ben Rudiak-Gould). It could be used as a Video Synthesizer, but this is not its usual function.

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.
  • 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?)
  • 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 A basic guide about deinterlacing, resizing and some other basic stuff.
    • Introduction basic AviSynth filters from A basic guide about smoothers, rainbow removal, sharpeners, color adjustment and some other basic stuff.

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
  • Forks
AviSynth+, 32-bit and 64-bit, author ultim at Download: | 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
v.2.5.8 MT, 64-bit, author SET, compiled by JoshyD at
  • Bugs and issues
Known Issues in v2.58.
Known Issues in v2.60.

Script Syntax

The official reference documentation.

Filters and 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.
ChannelMixer before and after

MaskHS(startHue=105, endHue=138) Histogram(mode="audiolevels")


Guides and Advanced topics

Resampling: Bilinear upsampling
Resampling: Blackman filter response


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Documentation Copyright

AviSynth documentation is Copyright (c) 2002-2019 AviSynth developers and contributors.

The contents of and are released under the Creative Commons Attribution-ShareAlike 3.0 License (CC BY-SA 3.0).

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