I also have a problem with the HTML5 embedded player while trying to use it in an UIWebView in an iOS project.
I load the iFrame code from above into the UIWebView and the video is loading correctly at first and I can start and watch if I’m fast enough to click the PLAY button. But after some seconds the video seems to disappear and the UIWebView just shows (what I guess) the thumbnail/preview image, so I cannot start it from there.
Summary: Everything seems to work if I’m fast enough to touch the PLAY button before the content of the iframe changes and only displays an image of the stream.
And btw: the same happens if I put the HTML code onto my website and try to check it in iOS’ Safari (demonstration (first working because fast clicking the play button, then reloading page and waiting + play button disappearing): https://vid.me/Cnbc)
Any ideas?
Edit: Same problem with the official iOS Plugin from http://dev.twitch.tv