ofVideoplayer - movies have green/grey stripe on edge

Playing videos on RPI3 most video formats/containers/codecs I have tried do play but they have a grey/green stripe down the right hand side. All play perfectly in OSX, but not on RPI.

Some movies do work ok but there is no obvious reason where the difference is. In fact I had 2 which are exactly the same format size etc - one is ok, but one has the stripes!

Anyone got a solution/workaround?

I may use OMXplayer addon but it has its own issues and I am porting an existing app. from OS X
and wanted to avoid a total rewrite and new issues.