nick legrand

I demuxed a dvd cause it has only DTS sound... and I don't have the
appropriate decoder... So i converted the dts track to ac3..

when I tried to mux it all (mv2, ac3, sup) into a vob... and play it.. I get
this strange issue...

during the time a 'subtitle' is on the screen.. the whole image becomes a
tiny bit lighter... if subs go rapid on and off the screen.. it's like a
flickering screen-image I get...

Does anyone know what I did wrong?

Thanks for any helpfull reply