I am trying to make a .webm file play through a HTML site on a Brightsign 4K1152
According to this the feature has existed for some time in Chrome:
https://developers.google.com/web/updates/2013/07/Alpha-transparency-in-Chrome-video
It works perfectly in my browser, but not on the Brightsign. The video plays there, but the alpha isn't applied, so no transparancy.
Is this impossible, or am I doing it wrong?