Okay found out what the issue is. It's not one singular video file that's stream, but a contiguous block of individual video files that are strung together. The extensions of *.f4f is the tip-off, it's a relatively new mutant flash container. The ten seconds or so that I played the flash video, VDH was showing about five or six individual files I could snag and all ending with *.f4f. This is a new container I haven't encountered before, but the technique itself (breaking a single video file into a bunch of tiny files which are sequentially sent) I have encountered before. VDH can still snag the individual files, but they will be identically named and the rate they loaded up, it will be frustrating to grab them serially. Plus there is the issue of having to stitching the files together so there is a playable single file - I believe it's just the F4V (Flash MPEG-4 video container) container that is sliced up in equal sized pieces. It's doable, but a lot of work.
As it stands, you will have to use something like FRAPS or CamStudio and grab it that way.