The beginning till 2:47 is not showing for me.
you are right. I think this has something to do with the internal Wistia encoding. Someone with authority over the account should follow this link: https://wistia.com/support/troubleshooting/video-encoding-troubleshooting
...and click on:Leave the file in the failed state (don't delete it!), and send us a link to the video. We'll get it cleaned up in no time. :)"