Youttube and ffmpeg

Well, some people down the video of youtube with extension GreaseMonkey in Firefox, but when you like open in Ubuntu you doesn't see because the format of video is .flv but in some blogs present the solution, continue is:

Install ffmpeg with apt-get:

# apt-get install ffmpeg

After run the command:

$ ffmpeg -i videofile.flv video.avi
$ ffmpeg -i videofile.flv video.mpeg

Great, right now you see the video in totem, xine, etc.