AviSynth is a video post-production tool that works as a frameserver, providing instant editing without temporary files. It has no graphical user interface and instead relies on a text-based script system for advanced non-linear editing. It is free open-source software licensed under the GNU General Public License GPLv2.
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avisynth.nl
argorar.github.io
WebMConverter is a Windows GUI wrapper around ffmpeg and AviSynth for converting videos to WebM without the command line. It is a fork of another project and also handles downloading, trimming and cropping. It requires .NET Framework 4.8 and 32-bit AviSynth 2.6.0.
vapoursynth.com
VapourSynth is a video manipulation application with a C++ core library and a Python module for creating video scripts. It is described as a rewrite inspired by Avisynth, offering frame-level multithreading, colorspaces specifiable at runtime, per-frame properties, and handling of video with format changes.