We have an article here: https://astroprint.zendesk.com/hc/en-us/articles/209139946-Browser-support-for-AstroBox-Live-Streaming
We also suffer from this limitation. Some things will happen in the future: a) Apple has said they’re working on support for WebRTC and b) we’re working on a native app which will include video support (though not in the first release).