Hi all, Heres my set up. I have a 24" iMac, which has my entire music library, all completely tagged and managed in iTunes. I also have a media PC in the lounge which runs XBMC with all my movies and TV shows stored, on a eSata 4 Days HD enclosure (DAS401.) This all works fairly well, but I've been looking at the Apple TV recently, but as the majority of my movies are 720p MKV rips, I thought it would be far too much to convert them all. However, after reading a thread or two on here, I found MKV tools, and the came to the realisation that the majority of my (250 rips) are h.264 video anyway. Therefore a lot of them can be repacked as MP4 (m4vs). The one thing I'm a tad unsure about is the audio. The majority of my rips are AC3 5.1, and for my test file that I created I converted this to AAC 5.1 and 2.0, but am i right in thing that ac3 5.1 can be passed through, so provided my audio system can decode it then I should be fine? Also if it converts it to AAC 5.1, what is the quality like? At the moment I need the 2.0 as I only have a stereo system anyway, but might upgrade at some point. What I also want to know is if there is a windows equivalent of MKVTools, as I would rather have my PC sat there doing the donkeywork converting them all as opposed to the iMac. (This also gives me the option to use both and get them done quicker!) On a side note, I've used iFlicks to add metadata to the converted file, and add to iTunes. It works well. My goal would be to Firewire 800 a Drobo (That contains all my TV and Movies) to the iMac. Everything loaded into iTunes and then served to the AppleTV. I presume a Drobo via Firewire to the iMac will be quick enough for the AppleTV to stream from?