Well, you’re right of course - the file plays smooth, no visual ‘stuttering’ on the passing car, in VLC and Windows MediaPlayer. Not so inside Cubase (or, to a lesser degree in Vegas Movie Studio NLE).
We can assume its been like this with Cubase’s video player for ages. Clearly I’ve just not been critical (bothered.?) enough in my previous efforts to see it (concentrating on the music/soundtrack instead).
Today, I’ve learned something. 
[EDIT]And, just tried in StudioOne v4.5.1 - its a winner.! Perfectly fluid and solid playback.