I found the mov format 1080p trailers on the apple site only cost you 25% of the cpu to play smoothly, while the mkv takes much more cpu even by using Plex. Guess the mov format is supported by the hardware acceleration of the graphic card. 1. I'm not particular sure what type of video format of .mov of the trailers on the apple website? 2. Is there anyway we can convert mkv to .mov format? Many thanks.