对nginx-rtmp中拉流的一个选项一直不明白，今天被指点，记录之：
If you pull from another nginx-rtmp-module you may just omit this.
When the option is active rtmp client send a special "live" flag. Certain servers make use of this flag but nginx-rtmp-module does not.
It may have sense for stream disambiguation between live and vod streams on those servers.
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nginx-rtmp 拉流时的live选项说明,布布扣,bubuko.com
原文：http://gforce.blog.51cto.com/171824/1365870