title: ffmpeg filename output format
body: <p>When using <code>ffmpeg</code> to output a series of frames as images, <a href="http://ffmpeg.org/ffmpeg.html#image2-1">the only format I can find documentation for</a> is <code>frame_%d.jpg</code>. The <code>%d</code> identifier is replaced by the sequential frame count.</p>
  
  <p>Are there other parameters I can use in the output file format? Specifically, I need the ability to add the timestamp of the specific frame.</p>