Slow motion

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Hi

I'd like to know if it is possible to create an Avisynth script to use with ffdshow, it's something like that:

if the video is 1280x720 or higher then the script would be
ConvertToYV12().MSU_FRC(7,"fast")


now, if the video is less then 1280x720, any other resolution the script would be:

ConvertToYV12().MSU_FRC(21,"fast")


Thanks.