二、安装Nginx相关模块
1.环境准备
yum install –y pcre pcre-devel
yum install –y zlib zlib-devel
2.下载nginx及rtmp模块
wget http://nginx.org/download/nginx-1.6.2.tar.gz
tar xzvf nginx_1.6.2.tar.gz
git clone git://github.com/arut/nginx-rtmp-module.git
3.编译nginx-rtmp
./configure --prefix=/usr/local/nginx --add-module=../nginx-rtmp-module --with-http_stub_status_module
make
make install
安装完成后，nginx位于/usr/local/nginx/sbin目录下，配置文件nginx.conf在/usr/local/nginx/conf目录下
++++++++测试nginx是否安装正确+++++++++++
#cd /usr/local/nginx
#./sbin/nginx -c ./conf/nginx.conf
打开网页http://localhost，如果显示Welcome表示安装下正确，如果没有显示，请查看一下nginx的日志。
++++++++测试RTMP+++++++++++
修改/usr/local/nginx/conf/nginx.conf的内容如下：
#debug
daemon off;
master_process off;
error_log ./error.log debug;
events{
worker_connections 1024;
}
rtmp{
server {
listen 1935;
chunk_size 4000;
#live
application myapp {
live on;
}
}
从网上下载一款RTMP推流工具，我使用的OBS（Open Broadcaster Software），开始推流rtmp://your_ip/myapp/test，使用播放器（http://www.cutv.com/demo/live_test.swf）查看是否正常。
++++++++测试HLS切片功能+++++++++++
修改/usr/local/nginx/conf/nginx.conf的内容如下：
#debug
daemon off;
master_process off;
error_log ./error.log debug;
events{
worker_connections 1024;
}
rtmp{
server {
listen 1935;
chunk_size 4000;
#live
application myapp {
live on;
hls on;
hls_path /tmp/hls;
hls_fragment 2s;
hls_playlist_length 6s;
}
}
}
#HTTP
http{
server {
listen 80;
#welcome
location / {
root html;
index index.html index.htm;
}
#hls
location /hls {
types {
application/vnd.apple.mpegusr m3u8;
video/mp2t ts;
}
root /tmp;
add_header Cache-Control no-cache;
}
}
}
使用VLC或iPAD上的播放器进行查看 http://yourip/hls/test.m3u8。
++++++++测试FFMPEG转码功能+++++++++++
修改/usr/local/nginx/conf/nginx.conf的内容如下：
#debug
daemon off;
master_process off;
error_log ./error.log debug;
events{
worker_connections 1024;
}
rtmp{
server {
listen 1935;
chunk_size 4000;
#live
application myapp {
live on;
exec /opt/ffmpeg/bin/ffmpeg -i rtmp://localhost/myapp/$name
-c:a copy -c:v libx264 -b:v 512K -g 30 -f flv rtmp://localhost/hls/$name_low;
}
application hls {
live on;
hls on;
hls_path /tmp/hls;
hls_nested on;
hls_fragment 2s;
hls_playlist_length 6s;
hls_variant _hi BANDWIDTH=640000;
}
}
}
#HTTP
http{
server {
listen 80;
#welcome
location / {
root html;
index index.html index.htm;
}
#hls
location /hls {
types {
application/vnd.apple.mpegusr m3u8;
video/mp2t ts;
}
root /tmp;
add_header Cache-Control no-cache;
}
}
}
使用ffmpeg转码时，
exec /opt/ffmpeg/bin/ffmpeg -i rtmp://localhost/myapp/$name
-c:a copy -c:v libx264 -b:v 512K -g 30 -f flv rtmp://localhost/hls/$name_low;
仅对视频进行转码，音频不做处理，同时向流从myapp转推到hls， hls_variant会生成一个多码率的m3u8文件，同时把切片文件存放到test_low目录下，访问多码率时，直接访问http://yourip/hls/test.m3u8，根据这个m3u8中的实现的内容访问相应的码流，在本例中，实际码流URL为http://yourip/hls/test_low/index.m3u8