title: ffmpeg keyframe extraction in Windows
body: <p>I had downloaded ffmpeg from this site : <a href="http://www.videohelp.com/tools/ffmpeg" rel="nofollow">http://www.videohelp.com/tools/ffmpeg</a>. </p>
  
  <p>Can someone tell me how to extract keyframes from an flv, mp3 or mp4 video? </p>
  
  <p>I tried this command that I found on the net : </p>
  
  <pre><code>ffmpeg -i Wildlife.wmv Desktop/img_%05d.jpeg 
  </code></pre>
  
  <p>I got the error </p>
  
  <blockquote>
    <p>could not open file : Desktop/img_%05.</p>
  </blockquote>
  
  <p>Thank you.</p>