Deinterlacing outputs small file only

[Selur]

Seems like LWLibavVideoSource can't decode your input.
If you got 64bit Lagarith vfw decoders in your system you could, try whether enabling "Filtering->Avisynth->Misc->Source->Prefer AviSource for avi input" helps.
Otherwise, if you disable 'Filtering->Avisynth->Misc->Source->LibavVideoSource instead of FFmpegSource", Hybrid will use FFVideoSource, that might help too.

Cu Selur