The problem seems to be in your build of ffms2. If I use TheRyuu's binary of 2.19 (the post right after yours in http://forum.doom9.org/showthread.php?p=1643738#post1643738), then it works perfectly. If I then overwrite ffms2.dll with your build r836, it stops working again.
Whatever the differences are in the source or compilation steps between your and TheRyuu's binary, it breaks your Avisynth 2.5 interface in ffms2.
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