app for capturing streaming files (Mac)

i’m using Jaksta which works most of the time but sometimes, it doesn’t work; not sure why.
for example, it doesn’t respond to this flick from YouTube: http://www.youtube.com/watch?v=SWd-58V2vno
so does anyone have a recommendation for another app that will capture stuff that Jaksta misses???
thanks guys!
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Answer #1
have u tried “ScreenFlow”
Answer #2
just now; am unfamiliar with it so i’ll have to figure out how to capture just the streaming video vs the entire monitor; thanks for the suggestion!