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• FFMPEG throws error can not open display error for :1

  2 décembre 2020, par Krishna

  i am using Xvfb for starting X server on display 1 and x11vnc is also set for -display :1 along with fluxbox as window manager on Ubuntu 20.04 LTS like using below commands

  


  sudo -i -u ubuntu Xvfb :1 +extension GLX -screen 0 1440x1080x16 -ac sudo -i -u ubuntu DISPLAY=:1 fluxbox sudo -i -u ubuntu x11vnc -forever -display :1

  


  and when i run command : "ffmpeg -video_size 1440x1080 -framerate 25 -f x11grab -i :1.0 -c:v libx264rgb -crf 0 -preset ultrafast sample.mp4" it runs, however when i execute programmatically through processbuilder i see that in output buffer stream log file as :1 : Invalid argument and doesn't start recording,

  


  Command sent to processBuilder is like below :

  


  pb = new ProcessBuilder(ffmpegLocation, "-video_size", "1440x1080x16",
"-f", "x11grab", "-i", ":1", "-c:v libx264 -crf 0 -preset ultrafast", "-framerate","25", outputfilepath()) ;

  


  -FYI i have tried setting environmental variable as export DISPLAY=:1 , but still same error and also do i need to set the DISPLAY=:1, since i am setting up display number when i start Xvfb ? this used to work using avconv on older version of ubuntu but i am stuck on display issue for ffmpeg, anyone has idea how to resolve this ?

  


• Cannot open connection tcp ://localhost:1935 when to set up custom RTMP stream

  8 janvier 2021, par showkey

  My simple network is as following :

  


  192.168.31.52 is my local pc 
192.168.31.251 is an ip camera.


  


  I can open the stream rtsp://192.168.31.251/cam/realmonitor?channel=1&subtype=0 with SMPlayer.
  
Build my nginx for customizing RTMP stream this way.

  


  sudo apt update
sudo apt install build-essential git
sudo apt install libpcre3-dev libssl-dev zlib1g-dev 
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
sudo make install


  


  Set config file for nginx :

  


  sudo vim /usr/local/nginx/conf/nginx.conf
rtmp { 
    server { 
        listen 1935; 
        application live { 
            live on; 
            interleave on;
 
            hls on; 
            hls_path /tmp/hls; 
            hls_fragment 15s; 
        } 
    } 
} 


  


  Then set permission for nginx :

  


  mkdir /tmp/hls
sudo chmod -R 755  /tmp/hls
sudo chown -R www-data:www-data  /tmp/hls


  


  Edit index.html in /tmp/hls.

  


  <p>test for nginx</p>&#xA;

  


  Both 127.0.0.1/index.html and 192.168.31.52/index.html can open the /tmp/hls/index.html.

  


  Now open port 1935 on my network :

  


  sudo firewall-cmd --zone=public --add-port=1935/tcp --permanent
sudo firewall-cmd --reload 
sudo firewall-cmd --list-ports | grep 1935
1935/tcp


  


  Start nginx :

  


  sudo systemctl start nginx


  


  Up stream the rtsp stream from ip camera—192.168.31.251 to local pc —192.168.31.52.

  


  input="rtsp://192.168.31.251/cam/realmonitor?channel=1&subtype=0"
output="rtmp://192.168.31.52:1935/live/sample"
ffmpeg -i $input -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 96k -r 25 -b:v 500k -s 640*480 -f flv $output


  


  It encounter the following errors :

  


  [tcp @ 0x59fb700] Connection to tcp://192.168.31.52:1935 failed: Connection refused
[rtmp @ 0x59fc5c0] Cannot open connection tcp://192.168.31.52:1935
rtmp://192.168.31.52:1935/live/sample: Connection refused


  


  How can fix it ?

  


• Cannot open connection tcp ://localhost:1935 when to set up custom RTMP stream server

  8 janvier 2021, par showkey

  My simple network is as following :

  


  192.168.31.52 is my local pc 
192.168.31.251 is an ip camera.


  


  I can open the stream rtsp://192.168.31.251/cam/realmonitor?channel=1&subtype=0 with SMPlayer.
  
Build my nginx for customizing RTMP stream this way.

  


  sudo apt update
sudo apt install build-essential git
sudo apt install libpcre3-dev libssl-dev zlib1g-dev 
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
sudo make install


  


  Set config file for nginx :

  


  sudo vim /usr/local/nginx/conf/nginx.conf
rtmp { 
    server { 
        listen 1935; 
        application live { 
            live on; 
            interleave on;
 
            hls on; 
            hls_path /tmp/hls; 
            hls_fragment 15s; 
        } 
    } 
} 


  


  Then set permission for nginx :

  


  mkdir /tmp/hls
sudo chmod -R 755  /tmp/hls
sudo chown -R www-data:www-data  /tmp/hls


  


  Edit index.html in /tmp/hls.

  


  <p>test for nginx</p>&#xA;

  


  Both 127.0.0.1/index.html and 192.168.31.52/index.html can open the /tmp/hls/index.html.

  


  Now open port 1935 on my network :

  


  sudo firewall-cmd --zone=public --add-port=1935/tcp --permanent
sudo firewall-cmd --reload 
sudo firewall-cmd --list-ports | grep 1935
1935/tcp


  


  Start nginx :

  


  sudo systemctl start nginx


  


  Up stream the rtsp stream from ip camera—192.168.31.251 to local pc —192.168.31.52.

  


  input="rtsp://192.168.31.251/cam/realmonitor?channel=1&subtype=0"
output="rtmp://192.168.31.52:1935/live/sample"
ffmpeg -i $input -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 96k -r 25 -b:v 500k -s 640*480 -f flv $output


  


  It encounter the following errors :

  


  [tcp @ 0x59fb700] Connection to tcp://192.168.31.52:1935 failed: Connection refused
[rtmp @ 0x59fc5c0] Cannot open connection tcp://192.168.31.52:1935
rtmp://192.168.31.52:1935/live/sample: Connection refused


  


  To keep the issue simple,i replace $input with a mp4 file in local pc,same error info.
  
How can fix it ?
  
Ping my machine :

  


  ping 192.168.31.52
PING 192.168.31.52 (192.168.31.52): 56 data bytes
64 bytes from 192.168.31.52: icmp_seq=0 ttl=64 time=0.108 ms
64 bytes from 192.168.31.52: icmp_seq=1 ttl=64 time=0.107 ms
64 bytes from 192.168.31.52: icmp_seq=2 ttl=64 time=0.111 ms


  


  Why the port 1935 not opened,i had restarted nginx after setting ?

  


  sudo lsof -i:1935
#nothing in the output
netstat -ltn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:51413           0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:1080          0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:8123          0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:8384          0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:9091            0.0.0.0:*               LISTEN     
tcp6       0      0 :::3306                 :::*                    LISTEN     
tcp6       0      0 :::80                   :::*                    LISTEN     
tcp6       0      0 :::22000                :::*                    LISTEN     
tcp6       0      0 :::51413                :::*                    LISTEN     
tcp6       0      0 :::21                   :::*                    LISTEN     
tcp6       0      0 :::22                   :::*                    LISTEN     
tcp6       0      0 ::1:25                  :::*                    LISTEN     
tcp6       0      0 :::2681                 :::*                    LISTEN  


  


  Firewall command can't work :

  


  sudo firewall-cmd --zone=public --add-port=1935/tcp --permanent
sudo firewall-cmd --reload 


  


  My nginx version :

  


  sudo nginx -v
nginx version: nginx/1.10.3