title: R shiny embedding static video shows broken video link and does not play
body: <p>I have a simple piece of code with a video (mp4) file and this does not work. Shows a 'broken' (crossed out) video image with play button and nothing else. Any idea what I am doing wrong?</p>
  
  <p>I place the video file in the www folder. I also tried to place it in the top level app folder where app.R is. This is with the Shiny Server (free version) on a Ubuntu Linux instance</p>
  
  <pre><code>ui &lt;- fluidPage(
    tags$video(
      src = 'myVideo.mp4',
      type = 'video/mp4',
      autoplay = 'autoplay',
      controls = 'controls'
      )
    )
  
  server &lt;- function(input, output, session) {
    }
  
  shinyApp(ui = ui, server = server)
  </code></pre>
  
  <p>Here is the screen shot of what I see:</p>
  
  <p><a href="https://i.stack.imgur.com/eAYN4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eAYN4.png" alt="my screen shot"></a></p>
  
  <p>I see the following in my log file:</p>
  
  <pre><code>Listening on http://127.0.0.1:40086
  </code></pre>
  
  <p>I don't see anything else in the log file.</p>