Generating the correct urls for the f4m segments seems to require a lot of work. Also raise an error if the video is not available from your location.
Reported at https://news.ycombinator.com/item?id=8648121
Update jsinterp.py
http://s.ytimg.com/yts/jsbin/html5player-zh_HK-vfl1NK6PR/html5player.js fix raise ExtractorError