https://media.w3.org/2010/05/sintel/trailer.mp4 

http://www.w3school.com.cn/example/html5/mov_bbb.mp4 

https://www.w3schools.com/html/movie.mp4 

http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4 

http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8