This 1.5Mb/s DTS 48/24 4.0 channel sample is not decoded properly by mplayer, or by dcadec built from the svn r82 of libdca. The right sound seems to be there, but the main thing you hear is a buzz, like the sound was chopped at 1kHz or something. A good description in words isn't coming to mind very easily, so just listen to the sample. My logitech Z-5500 speakers play back the sample just fine over S/PDIF, and recognize it as a DTS 48kHz/24bit stream with 3 front and 1 rear channel. This ~1min sample was cut from the DTS core of the DTS-HD track on the Edward Scissorhands BluRay. http://bluray.highdefdigest.com/606/edwardscissorhands.html Uploaded with (58MB) and without (14MB) 720p x264 video.