Wow that's pretty crappy for what I think is pay software. Sounds like you are only get digital audio that can pass through S/PDIF (i.e. DVD audio formats).
Try tsmuxer. Note however, that uncompressed, and especially 7.1 channel audio does not exist for the DVD video spec. So if you are trying for DVD, that's your prob. Even AVCHD which can handle HD video, cannot handle lossless audio over 2-channels.
Try tsmuxer. Note however, that uncompressed, and especially 7.1 channel audio does not exist for the DVD video spec. So if you are trying for DVD, that's your prob. Even AVCHD which can handle HD video, cannot handle lossless audio over 2-channels.