title: ffmpeg output blank image files on CentOS 6.4
body: <p>0I am trying to capture thumbnail images from a video by using ffmpeg.</p>
  
  <p>So I typed command like Below.</p>
  
  <pre><code>ffmpeg -i MyVideo.mp4 -s 480x270 -f image2 -vf fps=fps=1/600 thumb%03d.png
  </code></pre>
  
  <p>just like what ffmpeg official site suggested.</p>
  
  <p>The length of <code>MyVideo.mp4</code> is <code>01:46:03</code>, So I expected total 10 images from it.</p>
  
  <p>(because <code>fps=fps=1/600</code> part means 10minute 1piece.)</p>
  
  <p>But output is 12 pieces, and especially first one is broken.</p>
  
  <p>When I check it's information in GUI, it says "failed to load information".</p>