title: How to Add Font size in subtitles in ffmpeg video filter
body: <p>I'm using this command to crop,scale, and then add subtitles as overlay</p>
  
  <pre><code>ffmpeg -i input.avi  -vf "[in]crop=in_w:in_h-20:0:0 [crop]; [crop]scale=320:240 [scale];[scale]subtitles=srt.srt" -aspect 16:9 -vcodec libx264  -crf 23 oq.mp4
  </code></pre>
  
  <p>how can we set font size/color of subtitle ?</p>