YouTube Video Converter is the most powerful product to get videos from YouTube.com and convert to other video formats.
With its "downloading + playing+converting", you could easily get Youtube videos from YouTube to AVI. (Note: Apart from converting Youtube files to AVI, this Youtube to AVI Converter can also convert Youtube to MPG, 3GP, AVI)
www dot youtubeconverer dot org.
I've used that one before, but sometimes, my download just stops just halfway through the process.
Yeap, there are many apps for getting videos from youtube, but sometimes not all of them are good.. I use a soft, MP3videoraptor, for downloading musics, videos and mp3s, from music sites and even from web radios. It's cool cause it can convert the files into the formats I need directly while downloading the files.
you just need a flv converter, for youtube video format is FLV, I recommend Leawo, with which you can easily download by drag and convert flv to almost all kinds of video formats including MP4 for iPod. http://www.leawo.com/flv-converter/
zamzar.com will do it for free - just paste the YouTube url in the field, select the desired transcode format, and wait for your email with the download link. I seem to remember running across a couple of other sites that offer similar free transcoding.
ffmpeg will also do it for free, but you will have to make some custom code. Not really too difficult, you can probably just google some code that suits your purpose...
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YouTube Downloader software that allows you to download videos from YouTube, Google Video, Yahoo Video, and many others and convert them to other video formats.
The program is easy to use, just specify the URL for the video you want to download and click the Ok button!