Hello. I am using Mac OS X 10.4, the latest binary from the separate mplayerosx sourceforge project (dated May 20). I have installed the latest codecs from Real by downloading their nightly build. I can't play a Matroska file containing a video track encoded with RV40. It crashes everytime. I have tried MANY samples from the mplayer site, all Real videos work fine when they are in .avi, but the ones in .mkv always make mplayer crash. I have even extracted the video track using mkvextract, and once extracted, mplayer plays it without problems, so the bug is clearly related to how Mplayer handles .mkv files. Other .mkv files using codecs such as DivX / XVid work fine though... Any help on that? What can I do to help more? (I am going to download and build the CVS version of Mplayer soon, but I think it's a bit of work to build it under OS X...) Jean-Noël