Contains one Dolby Digital Plus track with a channel configuration of 5.1 at 256 kbps, and one H.264 video track. Channel ID 5.1 with H.264.

MediaInfo:
Video: English, 2 479 kb/s (3 000 kb/s), 1280*720 (16:9), at 29.970 (30000/1001) FPS, AVC (Main@L4) (CABAC / 2 Ref Frames)
Audio: 256 kb/s, 48.0 kHz, 6 channels, E-AC-3 (Dolby Digital Plus)

Source:
https://ott.dolby.com/OnDelKits/DDP/Dolby_Digital_Plus_Online_Delivery_Kit_v1.4.1/Test_Signals/muxed_streams/MP4/MP4_Muxed_Streams.html