Assumptions when building:

• Based on the data there was no unique identifier so I created one for each track
• Based on the data I am only checking for the existence of .m4a in the mediaUrl to identify audio files
• Based on the data I am adding a 'Content-Security-Policy': 'upgrade-insecure-requests' header to force requests over https instead of the http

At the two hour mark I had most of the player functionality working, I spent the next hour finalizing the styling, if I had more time I would:

• ensure the styling was responsive (this is currently a desktop only solution)
• add icons for the play/pause and next/previous buttons
• perform an accessibility check
• set up eslint to identify any problematic code
• spent more time tightening up the height of the player when switching between image/video content
• add additional video functionality (mute / duration / volume), or pivot and use a third-party video player in favor of my custom solution
• look into better solves for the https calls, perhaps convert all http urls to https to avoid Mixed Content warnings