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VapourSynth is an application for video manipulation. Or a plugin. Or a library. Its hard to tell because it has a core library written in C++ and a Python module to allow video scripts to be created. It came to be when I started thinking about alternative designs for Avisynth and most of it was written over a 3 month period. The software has been heavily inspired by Avisynth and aims to be a 21st century rewrite, taking advantage of the advancements computers have made since the late 90s. Requires Python!

Free software
Released:Jan 31,2018
File size:10.1MB
1 vote

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VapourSynth screenshot
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Latest version

r43 (January 31, 2018)


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Download VapourSynth r43  [10.1MB]  [Win]

Download VapourSynth r43 64-bit  [10.1MB]  [Win64]

Download Portable and other versions

Download VapourSynth r43 portable  [2.9MB]  [Win]  [Portable]

Download VapourSynth r43 portable 64-bit  [3.1MB]  [Win64]  [Portable]

Download old versions

Download VapourSynth old versions

Supported operating systems



Free software

Version history / Release notes / Changelog

updated to zimg v2.7.3
all vsscript functions are now internally guarded by a mutex to make them threadsafe
changed boxblur defaults to hradius and vradius=1, this makes more sense than having it throw an error with default arguments
added xyz as an alias for st428 in resize
add vsscript_getvsapi2 function which takes the required vapoursynth api version into account
a tuple is now only returned from get_output in python when alpha actually exist, this undoes the python syntax change in r41
fixed a possible hang on error in vspipe, regression introduced with the alpha support in r41

View full changelog

All features

The main features compared to Avisynth are:

Multithreaded Frame level multithreading
Generalized Colorspaces New Colorspaces can be specified at runtime
Per Frame Properties Additional metadata can be attached to frames
Python Based The scripting part is implemented as a Python module so you dont have have to learn a special language
Support for video with format changes Some video just cant stick to one format or frame size VapourSynth can handle any kind of change

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1 reviews, Showing 1 to 1 reviews

Not for the feint of heart, vapoursynth is intended for people conversant with scripting - this tool is essentially a more modern avisynth replacement using its own python based scripting and new sets of plugins. Some "old" avisynth plugins seem forward compatible, but not all. It is NOT a gui tool although there is a separate gui if you want (see over at doom9, vsedit is its name).

Highly versatile, building on the large knowledge base and many discussions and examples over at doom9, this is a highly versatile "swiss knife" of a thing to use when you can't afford $thousands for a commercial gui tool (vapoursynth is $free).

Nov 11, 2017 Version: r39 OS: Windows 10 64-bit Ease of use: 6/10 Functionality: 10/10 Value for money: 10/10 Overall: 9/10

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