dave@HPG72:~$ youtube-dl http://www.youtube.com/watch?v=J3uIQZkXPkU
[youtube] Setting language
[youtube] J3uIQZkXPkU: Downloading video webpage
[youtube] J3uIQZkXPkU: Downloading video info webpage
[youtube] J3uIQZkXPkU: Extracting video information
[download] Destination: J3uIQZkXPkU.webm
[download] 100.0% of 82.82M at  529.59k/s ETA 00:00
dave@HPG72:~$