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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!

Free software
OS: Win
File size: 11MB
Portable version
Old versions
Version history
9.4/10
4 votes
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Screenshots

VapourSynth screenshot
Latest version

R66 (March 8, 2024)



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Download VapourSynth R66 64-bit  11MB  Win64




Download Portable and other versions

Download VapourSynth R66 Portable 64-bit  9MB  Win64  Portable




Download old versions


Download VapourSynth old versions



Software License

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



Supported operating systems

WinWindows




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


r66:
updated the supported python versions to 3.12 and 3.8
added an option to write a full filter graph with time information to file when done processing in vspipe
clarified where different information will be output in vspipe
fixed backslashes and linebreaks not being properly escaped in dot graph output
copyframeprops can now optionally copy only a subset of properties
removeframeprops function now accepts wildcards in property names
added prop_src argument to shuffleplanes
added an access pattern mode when only repeatedly requesting the last frame of a clip
added approximate_gamma option to resizers (saindriches)
added plugin_path property to plugin object in python
audio is now clamped instead of wrapped around in audiomix and audiogain, these functions can also now warn when clipping happens
the vfw wrapper now provides simple waveformatex information automatically if the audio is mono or flagged as plain stereo and samples contain no padding bits
increased the get_frame error message buffer size in python, fewer messages should be truncated now
added missing st428 transfer characteristics to resize
made most graph information functions part of the stable api and bumped the version to 4.1
added new frame request pattern where only the last frame is requested multiple times to further improve cache usage
added new api functions for cache clearing
fixed request pattern set for selectevery with multiple identical offsets
fixed request pattern set for premultiply
expose number of bytes used by cache in python and clean up version and str representations of things (setsugennoao)
fixed modifyframe filter not properly copying its own videoinfo which may cause crashes if nothing else references the format node (jsaowji)
fixed setcache function leaking a node reference (jsaowji)

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




Sections/Browse similar tools






Alternative to VapourSynth


Avisynth







Guides and How to's


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



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4 reviews, Showing 1 to 4 reviews


Released Portable Vapoursynth R66 does not work as at 2024.03.10, so perhaps stick with R65 until it is fixed.
Over on github there's 1+ issues raised and work is occurring on it.
No doubt an updated R66 (or greater) will remain at or near the pinnacle of FREE video processing scripting engines.

Combined with Donald Graft's free vapoursynth-enabled DG tools, including the new GPU accelerated CudaSynth featuring an expanded "DGsource" with inbuilt gpu filters, this is in a very real sense a force to be reckoned with.


Review by hydra3333 on Mar 10, 2024 Version: R66 OS: Windows 11 64-bit Ease of use: 10/10 Functionality: 10/10 Value for money: 10/10 Overall: 10/10




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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