Trying to open a video in AV1 format.

Hello, I wondered if there is anyone who can help me open the above on my iMac. We recorded it about 4 years ago, as a band, and it plays ok on windows media player on my Microsoft Acer laptop but when I try it in the player on the Mac it says it can't open the file. I have some good speakers connected and it would be good to hear it through these rather than the laptops speakers.

I have tried to open it via Logic and Toast, with no luck. Any suggestions would be helpful, regards, Mike