Processing captured VHS tapes

[sandpipers01]

AviSource isn't a codec.
AviSource is a source filter which allows to use vfw decoders that are installed on a Windows system.
Whether those vfw decoders are better than their libav conterparts (assuming libav can decode the content too), totally depends on the vfw decoder.

And in my case, the 64bit decoder in my system is HuffYUV, so enabling AviSource will allow the use of HuffYUV.

Looking at the screen shot I can not recommend anything. Interlacing without motion isn't interlacing. 

I tried to attach a short .avi sample of my thirty year old VHS tape capture so you can see what I'm dealing with, but was unable to do so.