Here's the ffmpeg commit
https://git.ffmpeg.org/gitweb/ffmpeg...182aa0b3778b79
Quote:
avformat: add vapoursynth wrapper
This can "demux" .vpy files. Autodetection of .vpy scripts is
intentionally not done, because it would be a major security issue. You
need to force the format, for example with "-f vapoursynth" for the
FFmpeg CLI tools.
Some minor code copied from other LGPL parts of FFmpeg.
I did not find a good way to test a few of the more obscure VS features,
like VFR nodes, compat pixel formats, or nodes with dynamic size/format
changes. These can be easily implemented on demand.
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--enable-vapoursynth in the ffmpeg configure