Well, I ended up figuring out a manual method. In case anyone is interested, view the source of the page with the video you want, then search for "rtmp" and you get to a block of text like this:
Code:
<script type="text/javascript">
// player is jwplayer from www.longtailvideo.com
var s1 = new SWFObject("http://www.vega.org.uk/flash/player.swf","single","480","380","9");
s1.addVariable("type", "rtmp");
s1.addParam("allowfullscreen","true");
s1.addVariable("image","http://www.vega.org.uk/flash/preview.jpg");
s1.addVariable("streamer","rtmp://www.vega.org.uk:443/oflaDemo");
s1.addVariable("file","tnbtvoyagetothebottomofthesea320x240.flv");
s1.addVariable("showdigits","total");
//s1.addVariable("stretching", "fill");
s1.write("player");
</script>
Based on the above info, the rtmpdump command that worked ended up being like this:
Code:
rtmpdump -v -r rtmp://www.vega.org.uk:443/oflaDemo/ --playpath "tnbtvoyagetothebottomofthesea320x240.flv" -o output.flv
I'm still curious why rtmpsrv/rtmpsuck don't work on that site. Thanks.