开发前准备

确保安装好Nginx（需要添加nginx-http-flv-module模块）和FFmpeg

nginx-http-flv-module模块，下载路径： https://www.atbigapp.com/document/1854830904048279552?share_id=1855444640857513984

如果系统未安装nginx环境：
# 编译时指定nginx-http-flv-module的目录
./configure --add-module=/usr/local/nginx-http-flv-module-master
make
sudo make install

如果系统已有nginx环境：
nginx -V，得到输出
configure arguments: --prefix=/usr/local/nginx
# 编译时指定nginx-http-flv-module的目录
./configure --prefix=/usr/local/nginx --add-module=/usr/local/nginx-http-flv-module-master
make

安装完毕，修改nginx.conf

worker_processes  1; #should be 1 for Windows, for it doesn't support Unix domain socket
#worker_processes  auto; #from versions 1.3.8 and 1.2.5

#worker_cpu_affinity  0001 0010 0100 1000; #only available on FreeBSD and Linux
#worker_cpu_affinity  auto; #from version 1.9.10

error_log logs/error.log error;

#if the module is compiled as a dynamic module and features relevant
#to RTMP are needed, the command below MUST be specified and MUST be
#located before events directive, otherwise the module won't be loaded
#or will be loaded unsuccessfully when NGINX is started

#load_module modules/ngx_http_flv_live_module.so;

events {
    worker_connections  4096;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    keepalive_timeout  65;

    server {
        listen       80;

        location / {
            root   /var/www;
            index  index.html index.htm;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        location /live {
            flv_live on; #open flv live streaming (subscribe)
            chunked_transfer_encoding  on; #open 'Transfer-Encoding: chunked' response

            add_header 'Access-Control-Allow-Origin' '*'; #add additional HTTP header
            add_header 'Access-Control-Allow-Credentials' 'true'; #add additional HTTP header
        }

        location /hls {
            types {
                application/vnd.apple.mpegurl m3u8;
                video/mp2t ts;
            }

            root /tmp;
            add_header 'Cache-Control' 'no-cache';
        }

        location /dash {
            root /tmp;
            add_header 'Cache-Control' 'no-cache';
        }

        location /stat {
            #configuration of streaming & recording statistics

            rtmp_stat all;
            rtmp_stat_stylesheet stat.xsl;
        }

        location /stat.xsl {
            root /var/www/rtmp; #specify in where stat.xsl located
        }

        #if JSON style stat needed, no need to specify
        #stat.xsl but a new directive rtmp_stat_format

        #location /stat {
        #    rtmp_stat all;
        #    rtmp_stat_format json;
        #}

        location /control {
            rtmp_control all; #configuration of control module of rtmp
        }
    }
}

rtmp_auto_push on;
rtmp_auto_push_reconnect 1s;
rtmp_socket_dir /tmp;

# 添加RTMP服务
rtmp {
    out_queue           4096;
    out_cork            8;
    max_streams         128;
    timeout             15s;
    drop_idle_publisher 15s;

    log_interval 5s; #interval used by log module to log in access.log, it is very useful for debug
    log_size     1m; #buffer size used by log module to log in access.log

    server { #此为rtmp推流开启的端口
        listen 1935; # 推流使用的端口，默认1935端口在推流时可以省略，改为其他端接口需要自行指定

        application live {
            live on; #开启直播
            gop_cache on; #open GOP cache for reducing the wating time for the first picture of video
        }

        application hls {
            live on;
            hls on;
            hls_path /tmp/hls; #文件存放路径
            hls_fragment 20s; #每个TS文件包含20秒的视频内容
        }

        application dash {
            live on;
            dash on;
            dash_path /tmp/dash;
        }
    }
    #一个rtsp流对应一个端口，需要实现多个推流可以定义多个server改变不同的端口

}

配置完成

#重新加载配置文件
./nginx -s reload

运行ffmpeg程序

ffmpeg -rtsp_transport tcp -probesize 32 -analyzeduration 5000000 -i rtsp://xxx:xxx/stream -an -c:v libx264 -tune zerolatency -preset ultrafast -b:v 1000k -r 30 -g 15 -c:a aac -f flv rtmp://127.0.0.1:1935/live/room
注:
1.rtsp://xxx:xxx/stream  是需要推流的rtsp地址
2.rtmp://127.0.0.1:1935/live/room  是nginx中nginx.conf配置的，如需修改请修改nginx.conf配置文件
3.多个rtsp地址推流需要开启多个命令行，修改上面命令rtsp的流和对应rtmp://127.0.0.1:1935

把rtsp视频流转换为m3u8格式
ffmpeg -rtsp_transport tcp -y -i rtsp://xxx:xxx/stream -c copy -preset ultrafast -hls_time 20 -loglevel warning -f hls /tmp/hls/output.m3u8

FFmpeg常用命令行参数


-i 设定输入流
-f 设定输出格式(format)
-ss 开始时间
-t 时间长度
 
-aframes 设置要输出的音频帧数
-b:a 音频码率
-ar 设定采样率
-ac 设定声音的Channel数
-c:a 设定声音编解码器，如
果用copy表示原始编解码数据必
须被拷贝
-an 不处理音频
-af 音频过滤器
例子：ffmpeg -i test_1280x720.mp4 -b:a 192k -ar 48000 -ac 2 -c:a aac -aframes 200 out2.mp3
 
-vframes 设置要输出的视频帧数
-b 设定视频码率
-b:v 视频码率
-r 设定帧速率
-s 设定画面的宽与高
-vn 不处理视频
-aspect aspect 设置横纵比 4:3 16:9 或 1.3333 1.7777
-c:v 设定视频编解码器，如果用copy表示原始编解码数据必须被拷贝。
-vf 视频过滤器
例子：ffmpeg -i test.mp4 -vframes 300 -b:v 300k -r 30 -s 640x480 -aspect 16:9 -c:v libx265

-c：指定编码器
-c copy：直接复制，不经过重新编码（这样比较快）
-preset：指定输出的视频质量，会影响文件的生成速度，有以下几个可用的值 ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow

VLC播放器

下载vlc播放器，测试rtsp流以及推流后的rtmp，flv流地址是否正确。

rtsp：rtsp://xxx:xxx/stream

rtmp： http://127.0.0.1:80/live?port=1935&app=live&stream=room

m3u8：http://127.0.0.1:80/hls/output.m3u8