have a 2012 macbook air 4gb ram 256 mb hd. having problems streaming movies (kodi) to my samsung smart tv, tried air play through my apple tv3. the only is the movie pauses & stop on the smart tv buy is fine on my macbook air. so I tried using mini video out to hdmi to my smart tv. it does work but I loose 1/4 of the width and height of the picture. anyone have any ideas.