How do I save a Flowplayer RTMP video?

[streamer]

I am subscribed to a pay site, and there are some videos I want to save. Unfortunately VideoDownloadHelper can't save them. I want to save them without using a screen recorder.

The videos use Flowplayer. I looked at the page source for one of the videos, and it has the following:

<script type="text/javascript">
	var player = $f("player", "http://www.websitename.com/wp-content/plugins/flowplayer-plugin-with-mobile-support/flowplayer-3.2.16.swf", {
	  plugins: {
		rtmp: {
		  url: "http://www.websitename.com/wp-content/plugins/flowplayer-plugin-with-mobile-support/flowplayer.rtmp-3.2.12.swf",
		  netConnectionUrl: "rtmp://s1smix2z5i258m.cloudfront.net/cfx/st"
		}
	  },
	  clip: {
		provider: "rtmp",
		// call php function url-escaping for flowplayer config
		url: "mp4:connection/lesson1-2?Expires%3D1437898322%26Signature%3DTkwBCZ14hhID~BUplomeDyP8Kc1-fFjAOQXghxoW08OsbCt0vRT-Fw~p-udZT0SPQQ043IMx1kKAnuYt7wKEkssfFhnHoxqpHAawToAbS0sJrAiN-b7fpVgDUatm9TaG44gAWENDPS7KyZNSuwrFNJOWTrVvZFUj1tPRYyja-pE_%26Key-Pair-Id%3DAPKAJXW3UVME2LSMAROQ",
		scaling: "fit"
	  }
	});
	</script>

Any idea on how to save the video?