v1_EN_DeliveryRTMP

Delivery RTMP

The kernel feature of SRS is RTMP.

The RTMP and HLS, see: HLS

Compoare the RTMP and HLS, see: RTMP PK HLS

How to deploy SRS to support RTMP: Usage: RTMP

Use Scenario

RTMP the first supported video stream for flash, and the best realtime stream on PC flash:

• No plugin: The flash plugin already installed on almost all PC, no need other plugin to play the RTMP stream.
• Fast develop player: Only need 7lines to play a RTMP stream for flash. It is very complex to play the HLS or HDS on PC flash.
• Industrial-strength: RTMP server and flash player is very stable for RTMP.
• Realtime Stream for internet: RTMP latency in 0.8-3s, can be used in live show or meeting.
• The actual standard for encoder output for internet: RTMP is the actual standard protocol, for all encoder to publish stream to internet server, server will mux the RTMP to HLS, HDS or DASH.

SRS live streaming use RTMP as kernel protocol.

SRS vod streaming is in plan and use HTTP protocol.

FlashRTMP

RTMP最初就是adobe在flash上的协议，flash播放RTMP只需要几行as代码：

var conn = new NetConnection();
var stream = new NetStream(conn);
var video = new Video();
this.addChild(video);
video.attachNetStream(stream);
conn.connect("rtmp://192.168.1.170/live");
stream.play("livestream");

配置RTMP流

SRS只需要配置vhost和侦听端口就可以支持RTMP（vhost内容参考vhost）：

listen              1935;
vhost __defaultVhost__ {
}

启动服务器：./objs/srs -c conf/rtmp.conf

推送RTMP流

可以使用支持RTMP输出的编码器，譬如FMLE。在FMS URL中输入vhost/app，在Stream中输入流名称。譬如：

# 譬如RTMP流：rtmp://192.168.1.170/live/livestream
FMS URL: rtmp://192.168.1.170/live
Stream: livestream

RTMP的URL规则，Vhost规则，参考：RTMP URL&Vhost

部署分发RTMP流的实例，参考：Usage: RTMP

如下图所示：

观看RTMP流

可以使用支持RTMP流的播放器播放，譬如vlc/flash player，播放地址：rtmp://192.168.1.170/live/livestream

srs提供flash的播放器和编码器，支持在线播放RTMP/HLS流，参考：srs

RTMP流的低延时配置

RTMP流的延时在1-3秒，比HLS的延时更靠谱，低延时的配置参考：低延时

Winlin 2014.11