I have had a few issues with bluray playback on mac with the following details: 2.4 GHz Core 2 duo NVidia 8600 m GT 256 mb ram 4 GB ram OSX Lion 10.7.5 Using VLC 2.03 for playback Files either mounted as a disc or stored on hardisk. I have tried various sources and playback is always choppy and stutters. Where the video and audio pause for a few seconds before resuming ok. If I transcode the same bluray files into mkv files play back is seemless. I am not applying any compression and the resolution is the same as is the nominal file size. For a recent example 11.2 GB m2ts and 10.5 GB mkv file. This stuttering and choppy playback of bluray files through VLC has occured for a number of different sources. For each of these sources transcoding to mkv solves the stuttering/choppiness. Any ideas on how to resolve this?