ffmpeg dropping support for AviSynth 2.5x has already been a problem in earlier versions.
Quote:
Older versions created between March 2013 and September 2013 are not compatible with AviSynth versions prior to version 2.60.
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Now the ffmpeg developers in their eternal wisdom have decided to drop support for AviSynth 2.5x for good. The last version which works with AviSynth 2.5x is
ffmpeg-20150324-git-a2dd2d7-win32-static.7z.
Still the AviSynth SourceForge download page lists version 2.58 as the current stable release. Go figure...
Cheers
manolito