How To Save WebM Videos From YouTube And Play Them In Ubuntu

Now that YouTube supports WebM (actually, since it supports HTML5), it's easier than ever to download the videos - all you have to do is look at the page source (remember to enable HTML5 for YouTube first) and search for "videoPlayer.setAvailableFormat": you should see some links and next to it, the video quality is displayed, like so: Once you find the link for the video quality you want to download (unfortunately 1080p is not available in WebM yet), simply paste it in a new browser tab, then save it to your desktop and rename it to something .webm (whatever name you want, but append the .webm extension). Here is a link example for a 720p video: http://v11.lscache3.c.youtube.com/videoplayback?ip=0.0.0.0&sparams=id,expire,ip,ipbits,itag,algorithm,burst,factor,oc:U0dWTFNPT19FSkNNNl9LSVND&fexp=902303,900036&algorithm=throttle-factor&itag=45&ipbits=0&burst=40&sver=3&expire=1277341200&key=yt1&signature=725573BEE680BE61FC7219EE7DEC403E9D9FAFDA.6A2978DB9D871FAEE833082A2D