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VapourSynth is an application for video manipulation. Or a plugin. Or a library. It’s 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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Latest version

R48 / R48 Audio test (January 26, 2020)


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Download VapourSynth R48  11MB  Win

Download VapourSynth R48 64-bit  11MB  Win64

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Download VapourSynth R48 Portable  7MB  Win  Portable

Download VapourSynth R48 Portable 64-bit  8MB  Win64  Portable

Download VapourSynth R48 Audio test 64-bit  11MB  Win64

Download VapourSynth R48 Audio test Portable 64-bit  7MB  Win64  Portable

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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

Audio Support and how it works
Posted on January 26, 2020

Finally the first test version of audio support is ready and this post will describe how it works. Spoiler: It doesn’t work like in Avisynth.

In Python scripts audio nodes are just another unique type. They aren’t stuck together with a video track like in Avisynth. This can be both an advantage and a disadvantage, for example cutting audio and video at the same time by frame numbers will currently require a bit of user scripting. On the other hand with the correct helper functions it’ll be possible to manipulate multiple audio and video tracks as a group easily. Audio also always has a constant format unlike video.

Feedback and downloads are on the Doom9 forum as usual for highly experimental things.

Audio filters
BestAudioSource – a new sample accurate but somewhat slow FFmpeg based source filter (usage: core.bas.Source(“rule6.mp4”))
BlankAudio – a classic
AudioSplice and AudioTrim – with the expected Python overloads of course
Output support
VSPipe – outputs raw pcm audio and using the -y switch adds wave64 headers
AVFS – uses the audio node assigned to output slot 1
VFW – uses the audio node assigned to output slot 1 and video must be assigned to slot 0
An output example
import vapoursynth as vs
audio = vs.core.bas.Source("somefile.mp3", track=-1)
video = vs.core.std.BlankClip()
API Notes and Changes
Currently the API isn’t completely stable but only minor changes are expected at this point so starting to port plugins. The only mildly breaking change is that the clip type in function argument strings now has been renamed to vnode and obviously the new anode type has been introduced which may confuse existing software tries to parse the argument strings.

The best way to think of audio nodes is as a type completely separate from video nodes that only happen to share some functions to manipulate them. For example you can’t mix audio and video nodes in the same VSMap key or in any other context.

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 don’t have have to learn a special language
Support for video with format changes – Some video just can’t stick to one format or frame size VapourSynth can handle any kind of change

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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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