title: soft subtitles showing by default when video is played
body: <p>Is it possible to create a video file that contains a soft subtitle and shows it by default (as soon as you open it in VLC - without the need to activate the subtitle track) from an original video file and the appropriate subtitle file?</p>
  
  <p>I have tried the following:</p>
  
  <pre><code>ffmpeg -i input.mp4 -i input.ass -c:v copy -c:a copy -c:s copy -map 0:0 -map 0:1 -map 1:0 -y out.mkv
  </code></pre>
  
  <p>The resulting out.mkv does contain the subtitle but it does not show by default. Thanks for your help.</p>