Yeah, you don't have to produce a DVD-A with MLP audio, a Video DVD would be sufficient. Linear PCM audio goes up to 24/96 with 8 channels at a bitrate of 6144 kB/s
But I guess you are aiming at 24/48 DTS.
I wonder why there aren't more people sharing audio as a video DVD. A downside is of course that the cheap DVD players people have down-convert the audio quality anyway. But sure lot's of people aren't aware of this and grab the DVD anyway just for the 24 Bit audio sticker.
Just as a reminder, for audio only Video DVDs you still need a video stream, otherwise the DVD is not valid. Use highly compressed stills or a ultra low bitrate black screen. A AC3 stream also has to be present ... and let's not forget that in blind test hardly anybody notices the difference.
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