I have spent a lot of time researching this and will keep it short. This is a software issue and hopefully it will be resolved in the next update. In the meantime if a soft or hard reset does not work, like in my case, then your only option is to go into settings, general, developer options and tick "disable hardware overlays". You may also want to tick "force GPU rendering" but not really necessary. If you can't see Developer options go to settings, general, about phone and tap the build number at least 7 times. Please note that if you turn your note 3 off you will have to go back into developer options to tick again.
Mine now works fine whereas before it had so much flicker I couldn't actually see a playing video.