I have ffdshow installed for my decoding purposes. Which according to video inspector, it should be sufficient. http://img340.imageshack.us/img340/6363/screenaf7.png It says video is MPEG4. It says audio is DTS. ffdshow claims to decode both these formats. What I find odd is when i convert to a DVD, the vob files will play the audio fine but when i load the DVD via the IFO files or bup files there is no audio playback. I have tried the playback of the MKV in VLC and it plays fine so I dont think it is a problem with the MKV. Any help would be much appreciated.