Thanks, nullacht!
It looks like there were a few missing items I need to clue in on:
- append application with version number: ondemand?ovpfv=2.1.2
 - prepend --playpath with mp4: to match media type
 
	Code:
	rtmpdump
     -r rtmp://cp18289.edgefcs.net:1935/ondemand?ovpfv=2.1.2 
     --app ondemand?ovpfv=2.1.2
     --playpath mp4:media/2011/10/11/10112011-92v.m4v
     -o /Users/Guest/Desktop/outputfile
 Did you pull the application version (ondemand?ovpfv=2.1.2) from rtmpsuck or rtmpsrv? That value was not apparent in the html or any of my -z or -V debug output.