艾瑞克黑白講

環境架構介紹 :

Nginx 主機透過youtube-dl擷取YouTube直播串流 → ffmpeg轉檔成flv → 發送至本地端RTMP server

1. Nginx 安裝 (CentOS 7為例)

安裝相依性套件

yum update
yum groupinstall "Development Tools" -y
yum install git -y
yum install pcre-devel zlib-devel openssl-devel -y

安裝編譯Nginx

cd /usr/local/src/
git clone https://github.com/arut/nginx-rtmp-module.git
git clone https://github.com/nginx/nginx.git
cd nginx
./auto/configure --add-module=../nginx-rtmp-module
make
make install

2.Nginx nginx.conf 編寫(/usr/local/nginx/conf/nginx.conf)

worker_processes  1;

events {
    worker_connections  1024;
}

rtmp {
    server {
        listen 1935;
        application live {
            live           on;
            interleave     on;
            hls            on;
            hls_path       /tmp/hls;
            hls_playlist_length 3s;
            hls_fragment 1s;
       }
    }
}

http {
    default_type application/octet-stream;

    server {
        listen 80;
        location / {
            root /tmp/hls;
        }
    }

    types {
        application/vnd.apple.mpegurl m3u8;
        video/mp2t ts;
        text/html html;
    }
}

3.啟動Nginx

/usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful

/usr/local/nginx/sbin/nginx 

4.確認一下1935和80 port有帶起來

netstat -tunlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:1935            0.0.0.0:*               LISTEN      29768/nginx: master
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      29768/nginx: master
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1031/sshd

5. ffmpeg 開始推送YouTube串流進來

找到YouTube相關URL，透過youtube-dl查詢所有格式，選擇一個所需的格式來轉檔

youtube-dl --list-format https://www.youtube.com/watch?v=GmnBAjLQFic
[youtube] GmnBAjLQFic: Downloading webpage
[youtube] GmnBAjLQFic: Downloading m3u8 information
[youtube] GmnBAjLQFic: Downloading MPD manifest
[info] Available formats for GmnBAjLQFic:
format code  extension  resolution note
91           mp4        256x144     269k , avc1.4d400c, 30.0fps, mp4a.40.5
92           mp4        426x240     507k , avc1.4d4015, 30.0fps, mp4a.40.5
93           mp4        640x360     962k , avc1.4d401e, 30.0fps, mp4a.40.2
94           mp4        854x480    1282k , avc1.4d401f, 30.0fps, mp4a.40.2
95           mp4        1280x720   2447k , avc1.4d401f, 30.0fps, mp4a.40.2
96           mp4        1920x1080  4561k , avc1.4d4028, 30.0fps, mp4a.40.2 (best)

假設我們要選用解析度640*368的格式來轉檔，記得format欄位的93這個數字，然後透過ffmpeg來轉檔

ffmpeg -re -i $(youtube-dl -f 93 -g https://www.youtube.com/watch?v=GmnBAjLQFic) -c:v copy -c:a copy -f flv rtmp://10.140.15.225/live/yt

ffmpeg轉檔指令介紹 :

-re : 讀取輸入來源的原生frame rate

-i : 輸入來源(這邊是透過youtube-dl來擷取YouTube直播串流)

youtube-dl -f 93 -g https://www.youtube.com/watch?v=GmnBAjLQFic : -g 透過youtube-dl去下載該URL，-f 格式選擇93 (640*368的格式)

-c:v : video格式，copy代表跟來源相同

-c:a : 音源格式，copy代表跟來源相同

-f flv : 轉檔成flv格式

rtmp://10.140.15.225/live/yt : 將檔案送至 rtmp server中，live是定義在nginx.conf rtmp 中 application，yt自行定義一個串流名稱

rtmp {
    server {
        listen 1935;
        application live {
            live           on;
            interleave     on;
            hls            on;
            hls_path       /tmp/hls;
            hls_playlist_length 3s;
            hls_fragment 1s;
       }
    }
}

然後會在/tmp/hls目錄當中產生yt.m3u8的檔案，以及多個.ts檔案的分割片段

ll /tmp/hls/
total 408
-rw-r--r-- 1 nobody nobody 215448 Jul 20 14:47 yt-1.ts
-rw-r--r-- 1 nobody nobody 181608 Jul 20 14:47 yt-2.ts
-rw-r--r-- 1 nobody nobody    142 Jul 20 14:47 yt.m3u8

6.驗證直播

安裝VLC Player，輸入串流URL : http://your-ip/yt.m3u8