I'm using Roxio "MyDVD" to import an AVCHD (.m2ts) video file and burn as a Blu-ray movie disc. The original file has DTS 6 channel audio. After I import the file the audio has been changed to stereo. When I look at the "Project Settings" in "MyDVD" the audio shows as Dolby Digital AC-3 2.0 and there is no option to change it back to surround sound. How can I correct this problem?