I wrote a
VapourSynth plugin a few days ago.
This plugin works as a source filter on VapourSynth.
you will be able to use avisynth filters which does not exist yet for VS(e.g. DirectShowSource) and has some compatibility issue like ColorMatrix() with this plugin.
vsavsreader-1.0.0.zip
requirement:
VapourSynth-r30 or later
AviSYnth2.6/avisynth+
Microsoft Visual C++ 2015 Redistributable Packages