title: how to convert a Image to video using avconv
body: <p>i want to create a video from a image i used following code </p>
  
  <pre><code>shell_exec("avconv -f image2 -r 50 testimage.jpg output.mpg");
  </code></pre>
  
  <p>But when i trying  to playing output video it shows <strong>stream contains no data</strong> </p>