Why do my Blu-rays have both DTS-HD MA and a DTS versions of the same audio?

[wonkey_monkey]

My understanding was that all the various versions of DTS were backwards compatible - e.g. DTS-HD MA is built around a basic DTS core. So I'm not sure why my blu-ray rips have two copies of the main audio and two copies of the commentary audio, one in DTS-HD MA and one in DTS.

Is it just because they're not literally/completely backwards compatible, i.e. older equipment just won't be able to read the DTS-HD MA track at all, even to extract the core?

Or are they actually just one track on the blu-ray, and it's only because I've ripped it to an MKV that it's been separated into two for compatability reasons?

[huhn]

it is needed because there is a case where no audio could be played so a DD or DTS stream needs to be present except for stereo only.

sill a good question because i think the core of DTS-HD MA is not DTS but lossy DTS-HD so DTS or DD is still needed.

[wswartzendruber]

Hi there. If you're looking at your Blu-ray via some decryption application, you should see a listed DTS-HD and listed DTS stream for each real DTS-HD stream. This is because, as you have said, DTS-HD is an extension around legacy DTS. The decryption application in question is simply making it easy for you to extract the core stream by itself if you so desire.

[SeeMoreDigital]

My understanding was that all the various versions of DTS were backwards compatible - e.g. DTS-HD MA is built around a basic DTS core. So I'm not sure why my blu-ray rips have two copies of the main audio and two copies of the commentary audio, one in DTS-HD MA and one in DTS.

Did you rip them to the .mkv container using MakeMKV? If so MakeMKV offers the option to create separate 'lossy' audio streams (aka: core) de-muxed from the 'lossless' audio streams.

If you look at the properties of the original .m2ts stream it will most probably offer the 'lossless' audio stream along with the embedded 'lossy' core, not separate 'lossy' audio streams in the same language.

[wonkey_monkey]

Did you rip them to the .mkv container using MakeMKV? If so MakeMKV offers the option to create separate 'lossy' audio streams (aka: core) de-muxed from the 'lossless' audio streams.

I did use MakeMKV, so if that option is the default then that explains it. Edit: I checked and in the GUI it shows the DTS-HD MA stream, and then as a substream of that it shows the basic DTS one, ticked by default, so that must be it. Thanks!