hls多码率适应

https://developer.qiniu.com//kodo/kb/1618/how-to-make-use-of-more-than-seven-niuyun-storage-of-hls-rate-play

1. #EXTM3U
2. #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=15000000
3. http://test-hls.u.qiniudn.com/ultra-high.m3u8
4. #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=10000000
5. http://test-hls.u.qiniudn.com/high.m3u8
6. #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=5000000
7. http://test-hls.u.qiniudn.com/standard.m3u8
8. #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2500000
9. http://test-hls.u.qiniudn.com/low.m3u8

七牛的一个简单的解决方案