To exporting a video segment as a sequence of numbered images on disk in VirtualDub, use File > Save Image Sequence. What you may not know is that nearly all of the regular video processing modes are still enabled in this mode. This includes video format, frame rate decimation/conversion, filtering, etc. modes. In particular, if you only want to write out every fifth frame in the video, simply set frame rate decimation to "every 5" and you will only get 1/5th of the frames. Similarly, if you are writing out BMPs, you probably want to use no video compression and a normal video format such as 24-bit RGB. (That VirtualDub allows you to write out something silly like MPEG-4 compressed "BMPs" is actually a misfeature that I need to fix.) For the most part, though, what you see in the preview is what will get written out to disk as images.
or... tutorial here
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