Hey Rick, just sent my site via PM. At first the movies had autoplay on some of them. Now none of them work anymore. It's good to know I tried this with different MP4's I uploaded to Vimeo, but all rendered without sound.
This is the video embed code I used for all of them. I used XXXXX instead of actual Vimeo ID in this example.
<div style="padding:56.25% 0 0 0;position:relative;"><iframe src="https://player.vimeo.com/video/XXXXXX?autoplay=1&loop=1&title=0&byline=0&portrait=0" style="position:absolute;top:0;left:0;width:100%;height:100%;" frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe></div><script src="https://player.vimeo.com/api/player.js"></script>