title: Why utf-8 character in subtitle are in different from ffmpeg
body: <p>I want to burn a subtitle file(.srt) for a .mp4 video,and this is my command:</p>
  
  <pre><code>ffmpeg -i my.mp4 -c:v mpeg4 -q:v 1 -vf subtitles=my.srt new.mp4
  </code></pre>
  
  <p>It is not very clear in this picture,but when I play it I am sure the are in different size.</p>
  
  <p><a href="https://i.stack.imgur.com/ddXtJ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ddXtJ.jpg" alt="enter image description here"></a></p>