The problem can be related with “autoplay” feature of HTML videos.
In openvidu-js-java, the user interacts with the page and the video is shown. But in openvidu-mvc-java, the user click on a link and a new page with the session videos is show. That is, session page is “new” and you have to click to play it.
It is just an idea, because html video element seems very similar in the two apps:
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