Just a couple of suggestions to add...
The combination of Coojah and Blader has worked well for me with a number of sites where I was then able to FFMPEG the captured .flv into an MP4 or MKV.
http://www.hensence.com/en/coojah/download.htm
RTMPDumpHelper, updated with the KSV 2.4 or 2.5 package enabled me to capture videos from a variety of sites, including, in the past, Hulu.