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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!

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VapourSynth screenshot
Latest version

R59 / R60 RC1 (August 3, 2022)


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Download VapourSynth R59 64-bit  11MB  Win64

Download VapourSynth R59  10MB  Win

Download Beta, Portable and other versions

Download VapourSynth R59 Portable 64-bit  6MB  Win64  Portable

Download VapourSynth R59 Portable  6MB  Win  Portable

Download VapourSynth R60 RC1 64-bit  11MB  Win64

Download VapourSynth R60 RC1  11MB  Win

Download old versions

Download VapourSynth old versions

Software License

Free software / FOSS (Free download and also Free and Open Source Software)

Supported operating systems


Version history / Release notes / Changelog / What's New

fixed blankclip crashing when fpsnum or fpsden is 0 despite it being allowed
fixed invalid format ids sometimes being treated as api3 values when passed to resize
fixed error message frame generation in vfw
fixed writing beyond end out output buffer for audio in vfw
blankaudio now takes an array of channel constants since this better matches how most other functions work
fixed splitchannels crash on certain channel configurations (YomikoR)
added makefulldiff and mergefulldiff, these are versions of makediff and mergediff that don't clamp the difference to half range and instead use a higher precision diff clip
better error messages when filters get unsupported input formats or combinations thereof
freezeframes now accepts empty arrays and simply passes through the source clip
you can directly assign to frame-props
removed all deprecated (and replaced by better versions) functions in python: get_frame_async_raw, get_plugins, get_functions, list_functions, get_format, register_format
fixed convolution output for 9-15 bit material

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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Download VapourSynth Portable download from the Download links under Download and Download other versions!

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3 reviews, Showing 1 to 3 reviews

Thank you very much.

Review by Technoman on Nov 1, 2019 Version: R48 OS: Windows 7 64-bit Ease of use: 9/10 Functionality: 9/10 Value for money: 9/10 Overall: 9/10

This what AviSynth should have been: cross-platform, fast, and adapted to new technology. VapourSynth is also compatible with AviSynth+ plugins and scripts.

Review by 11213 on Apr 5, 2018 Version: 43 OS: Windows 10 64-bit Ease of use: 10/10 Functionality: 10/10 Value for money: 10/10 Overall: 10/10

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).

Review by hydra3333 on 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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