I need video converting software
 

...that will batch convert videos in all subfolers. I cannot seem to find any by doing a search. Does such an animal exist?

i can suggest you use is moyea software

Which version does one need to have that function?

Media Coder does folders

I use Procoder, but that one looks pretty good.

I had VideoCharge basic but it does not do recursive subfolders so I upgraded to Pro which does but it isn't stable and crashes frequently with runtime errors...so a waste of money. Procoder does not do recursive subfolders and Movavi does not either.

MediaCoder is free and seems to be doing a marvelous job thus far...though I had a learning curve to get it to process properly. At this point I highly recomend MediaCoder.