VapourSynth - Avisynth-inspired video processing framework, 21st century rewrite
vapoursynth.com
vapoursynth.com
About page gives good idea what it is and how it differs from Avisynth.
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.
The main features compared to Avisynth are:
* Multithreaded - Frame level multithreading that scales well
* 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 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
* Compatible with a large number of already existing Avisynth plugins
Mind that it is still WIP. It's not complete Avisynth drop-in replacement, but it's close as possible, yet diverges whenever things can/should be done better. It's mostly ABI-compatible for Windows Avisynth plugins.