Hi guys, Firstly, apologies if this has already been covered/answered. I have just taken ownership of my first Mac and haven't had any luck so far searching the Internet etc. I have a number of videos that were originally in MKV format that I converted to MPG using MKV2VOB in order to play them on my PS3. I would now like to play them on my Mac, but so far it won't play them, QT just shows a black window. The Mac identifies them as using codec H.264 and AC3, and they play fine in VLC. I have downloaded Perian but still no joy. My questions are: 1. Is my Mac capable of playing these files without further conversion? 2. If yes, how!? 3. If no, what is the best free tool to convert them and what format do I need to convert them to in order for them to work (with iPad and iPhone as well)? Thanks in advance for your help. Ideally I want all of these files in iTunes and the ability to put them on my iPad/iPhone (I realise that may require further conversion).