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VapourSynth is an application for video manipulation. Or a plugin. Or a library. Itís 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! Full description.

Free software
Win Win

Version:r26 History
Released:

Size:9.5MB



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  Latest version:
r26 (January 28, 2015)


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Download VapourSynth r26 (direct link) (9.5MB)


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Download VapourSynth old versions:
NameDate(Year-M-d)Size
vapoursynth-r26.exe2015-01-289.5MB
vapoursynth-r25.exe2014-11-247.2MB
vapoursynth-r24.exe2014-08-156.2MB
vapoursynth-r23.exe2014-03-126.1MB
vapoursynth-r22.exe2013-12-104.6MB
vapoursynth-r21.exe2013-10-303.5MB
vapoursynth_r20.exe2013-10-131.8MB
vapoursynth-r19.exe2013-07-312.1MB
vapoursynth_r19_rc2.exe2013-07-282.8MB
vapoursynth-r18.exe2013-01-142.1MB
vapoursynth-r17.exe2012-12-292.1MB
11 files48MB





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Supported operating systems:
Windows


Sections/Browse similar tools:
Video Editors (Advanced/NLE)

VapourSynth screenshot
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Version history / Release notes / Changelog:
R26 Ė Speed!
Posted on January 28, 2015

The focus on this release is mostly speed. By switching to using tcmalloc in windows some scripts get very substantial performance gains, in some extreme cases over 200% speedup but donít expect it in every clip. Other parts of the code were also steamlined and cleaned up for some additional minor gains.

The other highlight is as usual bugfixes, a pile of small and annoying things have been fixed and there is now full documentation of the API available. Something most open source projects donít manage to do ever (sprinkling doxygen everywhere doesnít count unless itís readable).

Important script writing detail
If you write a python module with functions to be imported into another script DO NOT store the core object in global scope. This will cause odd behavior since the global scope is only evaluated once but a new core is provided every time a script is reloaded. The result is that you will have two or more cores in the same script and most likely crash or get an error.

View full changelog



All features / Full description:
The main features compared to Avisynth are:

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


Alternative to VapourSynth:
Avisynth



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