title: What are all of the file extensions supported by FFmpeg
body: <p>How would I go about getting a list of all the file extensions supported by FFmpeg for use in an ExtensionFilter used by FileChooser in JavaFX?</p>
  
  <p>I am familiar with the "-codecs" and "-formats" options from FFmpeg, but these list the format and codec names which do not necessarily coincide with their file extensions.</p>
  
  <p>e.g. (partial output from "ffmpeg -formats")</p>
  
  <ul>
  <li>D  aac             raw ADTS AAC (Advanced Audio Coding)</li>
  <li>DE ac3             raw AC-3</li>
  <li>E matroska        Matroska</li>
  </ul>
  
  <p>parsing aac and ac3 from the output of ffmpeg would work fine to create file extensions for those types of files, but matroska has ".mkv" file extension.</p>