title: video timelapse with timestamp overlay
body: <p>I'm reconstructing a video from a large amount of jepg files.</p>
  
  <p>I'd like to keep a trace of original images' timestamp (at least every N minutes)
  Since there is no <em>mainstream</em> video container format allowing per-frame metadata, I could use a text overlay to keep track of the timestamp.</p>
  
  <p>Timestamp is both "stored" in the filename and in the image exif data, and
  I would avoid copy/preprocess gigabytes of jpeg with ImageMagick.</p>
  
  <p>Is there a way to combine mencoder <code>mf://@file-list</code> with an hypothetical <em>overlay filter</em> so that the timestamp of each image is encrusted?
  (I'm not even sure that the ffmpeg text filter would fit the need)</p>
  
  <p>Either ffmpeg or mplayer solutions welcomed.</p>