I had the same question. When I wanted to open a new thread about it, I found this one. Does Infuse in the meantime support TrueHD audio streams inside MP4 containers (mlpa) or is it known when this “upcoming version” will be released? The reason why I am asking is, this would allow me to just pass thru the TrueHD audio stream if I convert my movies to MP4. Sure, I could use MKV instead, but then I cannot play the files on my Mac natively. At the moment I need to convert all TrueHD streams with HandBrake to E-AC3. Which is an issue for 7.1 and Atmos, because HandBrake does only support 5.1 E-AC3 (because of a limitation in FFMpeg).
This feature was added to FFMpeg:
It was added to VLC:
And it has been added to MediaInfo (github/issues/451).
I can create such files with FFMpeg (and my custom build HandBrake) and play them with VLC. So, I am looking forward to play them as well with Infuse on my AppleTV.