title: ffmpeg -r option
body: <p>I am trying to use ffmpeg (under linux) to add a small title to a video. So, I use:</p>
  
  <pre><code>ffmpeg -i hk.avi -r 30000/1001 -metadata title="SOF" hk_titled.avi
  </code></pre>
  
  <p>The addition of title seems to work, but, the problem is the output file is about a 1/3rd of the file size of the input file and I was wondering why this is? Is this at the expense of quality of the video? I am unsure.. How do I preserve the same quality/size as the input file?</p>
  
  <p>The main point I am unable to figure out is the use of -r option. Going through the ffmpeg docs, it seems to suggest that -r is frames per second (The input video is 23.9fps). At the moment, (30000/1001) works out to 29 fps, but I was unsure if I should be using this value.</p>
  
  <p>Thanks for your time.</p>