Avanti GUI is a free front-end for FFmpeg with the option to insert Avisynth as pre-processor.
It offers user friendly control over all basic and advanced FFmpeg options. A number of template examples are included. No need to be familiar with Avisynth to use the predefined Avanti/Avisynth pre-processor options. Avanti doesn't installs itself and runs from any arbitrary folder. No adware or internet access.
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