A sample video with 5.1 channel audio can be viewed and downloaded here

https://drive.google.com/file/d/1yjkGI9f_Y90OdJFE5LyIV91XyNzFkrC4/view?usp=sharing

mediainfo shows the following output for this video:

General
ID                                       : 61697 (0xF101)
Complete name                            : mythtv-dvb-t2-6-audio-channels-sample.ts
Format                                   : MPEG-TS
File size                                : 21.6 MiB
Duration                                 : 56 s 638 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 3 196 kb/s

Video
ID                                       : 110 (0x6E)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L4.1@Main
Codec ID                                 : 36
Duration                                 : 17 h 12 min
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 50.000 FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 0)
Bit depth                                : 8 bits
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio #1
ID                                       : 120 (0x78)
Menu ID                                  : 1 (0x1)
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Muxing mode                              : LATM
Codec ID                                 : 17-2
Duration                                 : 56 s 576 ms
Bit rate mode                            : Variable
Channel(s)                               : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Delay relative to video                  : -612 ms
Language                                 : German

Audio #2
ID                                       : 121 (0x79)
Menu ID                                  : 1 (0x1)
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : HE-AAC / LC
Format settings                          : NBC
Muxing mode                              : LATM
Codec ID                                 : 17-2
Duration                                 : 56 s 320 ms
Bit rate mode                            : Variable
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz / 24.0 kHz
Frame rate                               : 23.438 FPS (1024 SPF)
Compression mode                         : Lossy
Delay relative to video                  : -472 ms

Text
ID                                       : 130 (0x82)-150
Menu ID                                  : 1 (0x1)
Format                                   : Teletext Subtitle
Language                                 : German

Other
ID                                       : 130 (0x82)-100
Menu ID                                  : 1 (0x1)
Format                                   : Teletext
Language                                 : German

Menu
ID                                       : 100 (0x64)
Menu ID                                  : 1 (0x1)
Duration                                 : 56 s 638 ms
List                                     : 110 (0x6E) (HEVC) / 120 (0x78) (AAC, German) / 121 (0x79) (AAC) / 130 (0x82)-100 (Teletext, de) / 130 (0x82)-150 (Teletext Subtitle, de) / 270 (0x10E) () / 276 (0x114) () / 2171 (0x87B) ()
Language                                 :  / German /  / German / German