This is a known issue. I can see in your source code that the video options for the player are:
"m4v": "https://www.centricbeats.com/video/stream/video_file/13/key=1/file.m4v",
m4v: "https://www.centricbeats.com/video/stream/video_file_mobile/13/key=1/file.m4v",
The first file plays while the second file does not play
PLAYING
https://www.centricbeats.com/video/stream/video_file/13/key=1/file.m4v
NOT PLAYING
https://www.centricbeats.com/video/stream/video_file_mobile/13/key=1/file.m4v
It not working for you makes me think the fix has not yet been released in the beta core you're using.
Check a different skin as the tracker says the issue is in the skin override of the module template, so if you try something like elastic, it wont have an over-ride and you can know the issue is skin related.