Sometimes I do not like to view video online, because my connection is not fast enough. And problem is service such as YouTube has no option to download. A web service called VideoDL able you to get the real video file URL quickly. Enter an URL of the video page, press submit, and you will have a download link immedately. You will need to get a Flash Player to video those Flash Video files.
VideoDL is a quick AJAX application that allows you to download online video into your computer. It supports top 3 video sites – YouTube, Google Video, and Break.com. Simply copy the link of the page with video and paste it into the textbox. Click “Get It!” and follow the instruction. After you have saved the files into your harddrive, make sure the extension of the file is .flv for Flash Player to recongize. Download FLV Player or VLC Player to open the flash video file. To decode FLV files from downloaded Google Video, YouTube, use video converter such as Riva FLV Encoder or Total Video Converter.
VideoDL.org – Download Online Video (Google Video, YouTube etc) in a Flash!
View more information: https://www.lifehack.org/articles/lifehack/download-video-from-youtube-google-video-online.html