title: ffmpeg add video title / name as subtitle track
body: <p>Is there an easy way to use ffmpeg to add the title of a video (mp4, mkv etc) as a custom subtitle track (lasting for the entire duration of the video)?</p>
  
  <p>For example: "The adventures of foo.mp4" with a video duration of 100 seconds would get the subtitle "The adventures of foo.mp4" embedded from second 0-100 on a subtitle track?</p>