In response to your query, if the flash video (file extension would be .flv) is on your hard drive you can convert the flash video to any required format by using ‘Any Video Converter’. Please find the link below to download
In order to capture or save the streaming video which is on the internet, you can download and install ‘youtube downloader’ which can download videos from most of video streaming sites and also convert them to other video formats.
Thanks & Regards
Dell Social Media Responder