Extracting multiple video tracks from a single video

I have a video file I need to process, output from a 360 camera with 8 individual cameras. These 8 outputs are combined to a single MP4 file with all views contained. Viewing this on windows 10 Film & TV only shows 4 of the outputs, and processing this video in VS2017 with opencv 3.4.1 gives an output of the other 4 cameras.

I tried opening the video in VLC and it appears the video has 2 separate tracks with 4 cameras information on each. Windows displays track 2, while extracting frames with opencv displays track 1.

I'd like to be able to interact with all data but am unsure on how to retrieve frames from track 2.

Could anyone point me in the right direction?