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• OpenCV - suppress, hide or disable the error or warning messages outputted to the screen

  11 juillet 2023, par Amphagory

  I was wondering if there was a way to suppress, hide or disable the error or warning messages outputted to the screen from OpenCV, I think originating from cap.read() ?

  



  I think they come from OpenCV using FFMpeg and they either show up as follows :

  



  CASE 1 :

  



  [mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.
[mpeg2video @ 0x3430c00] Invalid frame dimensions 0x0.


  



  or

  



  CASE 2 :

  



  ...
[h264 @ 0x29e5a40] co located POCs unavailable
[h264 @ 0x2a6c3c0] co located POCs unavailable
[h264 @ 0x29d7b80] reference picture missing during reorder
[h264 @ 0x29d7b80] Missing reference picture, default is 65656
[h264 @ 0x298da80] mmco: unref short failure
[h264 @ 0x298da80] number of reference frames (0+6) exceeds max (5; probably corrupt input), discarding one
[h264 @ 0x29dc700] reference picture missing during reorder
[h264 @ 0x29dc700] Missing reference picture, default is 65672
[h264 @ 0x2a27180] mmco: unref short failure
[h264 @ 0x2af7680] co located POCs unavailable
[h264 @ 0x29e5a40] mmco: unref short failure
[h264 @ 0x29e5a40] number of reference frames (0+6) exceeds max (5; probably corrupt input), discarding one
[h264 @ 0x2af9040] mmco: unref short failure


  



  To my understanding CASE 1, is a known issue, as it is looking for a PES header. There are only a few of these messages until it finds the header.

  



  I do not understand CASE 2, I do not know what is happening, but it seems to read the image @ frame. There are many many of these messages which outputs to the console window and adds minutes to the processing time.

  


• avcodec/nvdec : don't add thread buffer twice

  12 novembre 2017, par Timo Rothenpieler

  avcodec/nvdec : don't add thread buffer twice
  This is already added to the initial pool size in ff_decode_get_hw_frames_ctx,
  
  so adding it here again increases the amount of surfaces needlessly.
  

  • [DH] libavcodec/nvdec.c

• How to run ffmpeg on demand when someone opens my website with the player where a remote IP camera is displayed ?

  8 mai 2023, par alexiter

  I set up an nginx server to stream from an IP camera located elsewhere, I used a windows server because it was the one I had no use for (I usually prefer linux), I would need to know how I can make the ffmpeg command run only when someone opens the website where the player is located.

  


  This is my nginx.conf server code :

  


  worker_processes  1;

error_log  logs/error.log info;

events {
    worker_connections  1024;
}
rtmp {
    server {
        listen 1935;
        ping 30s;
        notify_method get;
        application live {
            live on;
            on_publish http://*******:8080/auth;
            dash on; 
            dash_path tmp/dash;
            
            
        }
    }
}
http{

   server {
        listen 8080;
        location /auth {
        if ($arg_psk = '*****') {
    return 201;
    }
  return 404;
  }
}
   
   server {
        listen 8443 ssl;
        server_name stream.*****.com;
        
        ssl on;
        ssl_certificate C:/Certbot/live/stream.*****.com/fullchain.pem;
        ssl_certificate_key C:/Certbot/live/stream.****.com/privkey.pem;
        ssl_session_timeout 5m;
        charset utf-8;
        location /dash {
            root tmp;
            add_header Cache-Control no-cache;
        }
        location / {
            root www;
        }
        

   }
}



  


  The command that I use from the DOS console in windows is this :

  


  ffmpeg -rtsp_transport tcp -i rtsp://*****:******@******.com:557/Streaming/Channels/101 -c copy -f flv -y -t 35 rtmp://********:1935/live/stream?psk=********


  


  Basically what I need is that ffmpeg is not running constantly, only when someone wants to view the video from the IP camera. (I have programmed ffmpeg to finish after 35 seconds, although I will put five minutes later)