Share 'Help please! Video screen capture to youtube.'

Hi, I thoguht I'd make a wee instructional screen capture video for my class and put it on youtube for them to access. I downloaded the jing free version, whcih is a nice screen capture package. BUT .. it only produces .swf files, and youtube can't read these. I've been surfing around looking for a freeware video converter, to no avail. I installed one called 'prism', but it doesn't work with .sw…