title: Finding the dimension (height x width) of a MP4 file being uploaded
body: <p>My ASP.NET / C# web app allows users to upload MP4 files to a database for later display using the HTML5 <code>&lt;video&gt;</code> tag. </p>
  
  <p>What I am looking for is a way (code, component) to determine the on-screen dimension that a given MP4 file will need to properly play. I haven't been able to find anything so far.</p>
  
  <p>Given a MP4 file (as a file upload) - how can I determine the on-screen dimensions of the video contained in it, using C# code? Is there something like MP4 metadata that can be read from the file? </p>