it's not existing yet (afaik), and you would have some problems with matroska VFR files.... Avisynth is based on VFW, so only mkv file created in vfw-compatibility mode will be processed.
imho, as the name says, Avisynth has been created to process avi file, and only that. if your mkv can be processed in avisynth then just transcode it, else, you have to create a "mkvsynth" anyway.
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