http://devimages.apple.com/iphone/samples/bipbop/gear1/prog_index.m3u8
https://test-streams.mux.dev/x36xhzz/x36xhzz.m3u8
https://example.com/path/to/video3.m3u8
# 以 # 开头的行为注释，播放器会忽略
# 下面添加更多地址...
https://example.com/path/to/video4.m3u8