Do your videos play/have sound in the standard AEM Video component?

Thanks very much for pointing me in the right direction. (I wasn't part of the app set up originally.)

It sounds like the issue is with the structure of your content, not the layout. Go into Content Map and check your app structure. Make sure that your "Home" collection is the first item in your top-level collection. My guess is that an article is the first item, so that's showing up first, and you're not seeing the layout.