title: getting mulitple images from a single stream piped from ffmpeg stdout
body: <p>I start a process to retrieve a few frames from a video file with ffmpeg, </p>
  
  <pre><code>ffmpeg -i "&lt;videofile&gt;.mp4" -frames:v 10 -f image2pipe pipe:1
  </code></pre>
  
  <p>and pipe the images to stdout -</p>
  
  <pre><code>var cmd = Process.Start(p);
  var stream = cmd.StandardOutput.BaseStream;
  var img = Image.FromStream(stream);
  </code></pre>
  
  <p>Getting the first image this way works, but how do I get all of them?</p>