VDownloader is a computer software that helps you download and save videos from the Internet. Download videos from YouTube, MySpace, iFilm, DailyMotion, Metacafe and much more. You can also convert videos using VDownloader. VDownloader comes packed with features you cannot afford to miss. VDownloader will help you keep those great video clips you always wanted to keep.
That doesn't always work for me.1) Open Safari
2) Go to www.youtube.com
3) Navigate to the video you want to download
4) Let it load all of the way (the little red bar at the bottom)
5) Go to 'Window/Activity' . This has an index of all files currently open in Safari.
6) Find the biggest file. (The files are organised by windows/tabs, so it should be easy)
7) Double-Click that file. It will now download to your downloads folder.
I know it sounds strange but sometime there is just no youtube video file in the activity window. I've successfully used this method before but stopped recently as a lot more content is just not showing up in window.Activity Monitor should work for Youtube, it doesn't work on certain sites that don't directly load the content, but I've never had trouble on Youtube. Normally you just press Command+Option+A or select "Window" and click "Activity" in the menu bar at the top.
Look for the largest file most of the time (won't be too large if it's a 3 second clip). Double click to begin download. You don't have to wait for the youtube player to finish loading the content because you're getting it from the same place as the player is. You need to download from the beginning regardless of how much the youtube player has loaded.
To save them as movie files, you can use a free program called Mpeg Streamclip. It has a batch processing utility that allows it to handle multiple files, and export them as mov files for you. You MAY require quicktime Pro for that functionality, I'm not entirely sure.
I just used it to save a bunch of reference movies as self-contained quicktime movies rather than clicking "save as" in Quicktime Pro one at a time for every file.