Vapoursynth is a robust video processing framework with capabilities similar to AviSynth. It was created to serve as a successor to AviSynth and has been gaining in popularity due to its increased stability and improved performance.
Unlike AviSynth, Vapoursynth scripts are written in Python, making them more accessible to a broader range of users. The framework offers many advantages over AviSynth, including support for 64-bit systems, better multithreading performance, and a more robust plugin API.
If you’re looking for a powerful video processing tool, Vapoursynth is an excellent option.