為什麼無法使用 hls url 打開流？

我根據nginx官方手冊在本地電腦上搭建RTMP伺服器：

video-streaming-for-remote-learning-with-nginx

我的 nginx 設置：

sudo vim /usr/local/nginx/conf/nginx.conf    
worker_processes  1;   
error_log  logs/error.log;
worker_rlimit_nofile 8192;

events {
 worker_connections  1024;  
}  

rtmp { 
   server { 
       listen 1935; 
       application live { 
           live on; 
           interleave on;

           hls on; 
           hls_path /mnt/hls; 
           hls_fragment 15s; 
       } 
   } 
} 

http { 
   default_type application/octet-stream;

   server { 
       listen 80; 
       location /tv { 
           root /mnt/hls; 
       } 
   }

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

設置 rtmp 網址：

output="rtmp://127.0.0.1:1935/live/sample"  

推送網路攝像頭：

ffmpeg -f v4l2 -video_size 640x480 -i /dev/video0 -c:v libx264 -f flv $output

使用 rtmp 協議拉流：

ffplay rtmp://127.0.0.1:1935/live/sample

我成功獲得了影片。

使用 hls 協議拉流：

ffplay http://127.0.0.1/live/sample
HTTP error 404 Not Found
http://127.0.0.1:80/live/sample.m3u8: Server returned 404 Not Found 
#It can't get video with browser.

如何解決？http段中的以下程式碼片段是什麼意思？

   server { 
       listen 80; 
       location /tv { 
           root /mnt/hls; 
       } 
   }

我應該在哪裡mkdir /tv？

改變

hls_path /mnt/hls;

至

hls_path /mnt/hls/tv;

該流將在http://127.0.0.1/tv/sample.m3u8提供。

http和rtmp和hls的push url和pull url有關係。第一組設置工作正常。

Pull url  

   http://127.0.0.1/tv/sample.m3u8

Push url

   rtmp://127.0.0.1:1935/live/sample

       location /tv { 
           root /mnt/hls; 
       } 
rtmp setting

       application live { 
           live on; 
           interleave on; 
           hls on; 
           hls_path /mnt/hls; 
       } 

http setting

       location /tv { 
           root /mnt/hls; 
       } 

它也可以寫成以下對，它們的作用與上述相同：

Pull url  

   http://127.0.0.1/tv/sample.m3u8

Push url

   rtmp://127.0.0.1:1935/tv/sample

       location /tv { 
           root /mnt; 
       } 
rtmp setting

       application tv { 
           live on; 
           interleave on; 
           hls on; 
           hls_path /mnt/tv; 
       } 

http setting

       location /tv { 
           root /mnt/hls; 
       } 

引用自：https://unix.stackexchange.com/questions/628717