DTS-HD 7.1 showing as DTS 5.1

I use a Roku 3 and windows media server.

 

I know ROKU can't play or passthough DTS-HD or TrueHD, but I have the following question..

I have a number of MKV files that were created via Handbrake with the DTS-HD passthrough option.  In Windows Plex Media Server the audio track is listed as DTS 5.1, when it is a DTS-HD 7.1 track.  Is Plex just lookiing at the DTS 5.1 Core audio and reporting that?

I have created some MKVs with a TrueHD track and Plex shows TrueHD 7.1.

 

I posted this almost a year ago in the ROKU Streaming Players forum, but this should be a better forum.

 

Below are some comparisons:

MediaInfo 0.7.68 Output - Life of Pi

Audio #1
ID                                       : 2
Format                                   : DTS
Format/Info                              : Digital Theater Systems
Format profile                           : MA / Core
Mode                                     : 16
Format settings, Endianness              : Big
Codec ID                                 : A_DTS
Duration                                 : 2h 6mn
Bit rate mode                            : Variable
Bit rate                                 : Unknown / 1 509 Kbps
Channel(s)                               : 8 channels / 6 channels
Channel positions                        : Front: L C R, Side: L R, Back: L R, LFE / Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 24 bits
Compression mode                         : Lossless / Lossy
Language                                 : English
Default                                  : Yes
Forced                                   : No

 

PMS 0.9.11 Media Info Output  - Life of Pi
AUDIO
Codec DCA
Channels 5.1
Bitrate 1536 kbps
Language English
Bit Depth 24
Bitrate Mode VBR
Codec I D A_DTS
Duration 2:06:59
Profile ma
Sampling Rate 48000 Hz

---

MediaInfo 0.7.68 Output - E.T. The Extra-Terrestrial
Audio #1
ID                                       : 2
Format                                   : DTS
Format/Info                              : Digital Theater Systems
Format profile                           : MA / Core
Mode                                     : 16
Format settings, Endianness              : Big
Codec ID                                 : A_DTS
Duration                                 : 1h 54mn
Bit rate mode                            : Variable
Bit rate                                 : Unknown / 1 509 Kbps
Channel(s)                               : 8 channels / 6 channels
Channel positions                        : Front: L C R, Side: L R, Back: L R, LFE / Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 24 bits
Compression mode                         : Lossless / Lossy
Language                                 : English
Default                                  : Yes
Forced                                   : No

PMS 0.9.11 Media Info Output - E.T. The Extra-Terrestrial
AUDIO
Codec DCA
Channels 5.1
Bitrate 1536 kbps
Language English
Bit Depth 24
Bitrate Mode VBR
Codec I D A_DTS
Duration 1:54:35
Profile ma
Sampling Rate 48000 Hz