I opened an MKV move in vdub mod so I can extract the 2nd audio stream (jap) and re-encode the movie as XVID minus the 1st audio stream (eng). When I try to extract it I get this: Error initializing audio stream decompression, the request conversion is not possible, check to make sure you have the required codec. I can play the sound, but I just can't extract it. So how do I know which codec to get, and where to get it? I haven't had this problem before.