YV12InterlacedReduceBy2 is a fast Reduce By 2 filter. It works by taking only the even (starting with 0) pixels from the top field. So it will reduce both the width and height by a factor of 2. It blends the chroma slightly to avoid YV12 chroma delay.
USAGE - To use it just:
1) Place the InterlacedReduceBy2.dll in a directory somewhere.
2) In your Avisynth file use commands similar to
LoadPlugin("F:\YV12InterlacedReduceBy2\YV12InterlacedReduceBy2.dll")
AviSource("D:\wherever\myfile.avi")
YV12InterlacedReduceBy2()Of course replace the file and directory names with your own. There are no parameters. This is usefull as a very fast downsize that needs no deinterlacing.
USAGE 2
There is a second similar function enclosed in the dll called YV12InterlacedSelectTopFields(). This will select top fields only and adjust for chroma delay but leave the width unchanged.
LoadPlugin("F:\YV12InterlacedReduceBy2\YV12InterlacedReduceBy2.dll")
Avisource("D:\wherever\myfile.avi")
YV12InterlacedSelectTopFields()$Date: 2004/08/17 20:31:19 $