AVPlayerViewController scrub bar jumps between second intervals
<p>I've implemented a standard Swift video player:-</p>

<pre><code>   let path = NSBundle.mainBundle().pathForResource(assetName, ofType: "m4v")
   let url = NSURL.fileURLWithPath(path!)
   player = AVPlayer(URL: url)
   playerViewController.player = player
</code></pre>

<p>Using the standard build-it controller bar at the bottom of the video.  I've noticed that during playback, the built-in scrub/progress bar (the sliding control that shows the time elapsed in the video) jumps at second intervals.</p>

<p>Is there any way to quantise this control position to frame intervals?  Or make it so that it moves continuously, rather than updating and jumping position every second.</p>