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• ffmpeg decoding MP4 to Open GL texture black screen

  5 septembre 2019, par Dakiaiu

  I decoded a MP4 video and want to display the AVFrame via glTexImage2D and glTexSubImage2D but all I get is a blank GL Window.

  I’ve tried looking at the various examples in the ffmpeg github examples tree. https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples and different posts from the past and recently on this site learning slowly from them but I could not find anything I am doing wrong.

  while(av_read_frame(format_context,packet) >= 0){
  
  
  
          if(packet->stream_index == video_stream_index){
  
  
  
              av_frame = decode(codec_context,av_frame,packet);
  
  
  
              sws_context = sws_getContext(codec_context->width,codec_context->height,codec_context->pix_fmt,codec_context->width,codec_context->height,
  
                      AV_PIX_FMT_RGB24, SWS_BICUBIC,nullptr,nullptr,nullptr);
  
  
  
              sws_scale(sws_context,
  
                      av_frame->data,
  
                      av_frame->linesize,
  
                      0,
  
                      codec_context->height,
  
                      gl_frame->data,
  
                      gl_frame->linesize);
  
  
  
              sws_freeContext(sws_context);
  
  
  
              if(first_use == true) {
  
  
  
                  glTexImage2D(GL_TEXTURE_2D,
  
                               0,
  
                               GL_RGB,
  
                               codec_context->width,
  
                               codec_context->height,
  
                               0,
  
                               GL_RGB,
  
                               GL_UNSIGNED_BYTE,
  
                               gl_frame->data[0]);
  
  
  
                  first_use = false;
  
  
  
              }else{
  
  
  
                  glTexSubImage2D(GL_TEXTURE_2D,
  
                          0,
  
                          0,
  
                          0,
  
                          codec_context->width,
  
                          codec_context->height,
  
                          GL_RGB,
  
                          GL_UNSIGNED_BYTE,
  
                          gl_frame->data[0]);
  
  
  
              }
  
  
  
          }
  
  
  
  
  
      }
  
  
  
  
  
      while( glfwGetKey(window, GLFW_KEY_ESCAPE ) != GLFW_PRESS &&
  
             glfwWindowShouldClose(window) == 0 );
  
  
  
  }

  The frames decode successfully but I cannot see anything. It has to be something with the above gl code that I have done wrong. I can show the ffmpeg code above if necessary.

• NGINX-RTMP : adaptive multi bitrate streaming by ffmpeg got BLACK SREEN OUT PUT

  28 mars 2022, par duxng17

  I am using Nginx-rtmp for live adaptive bitrate streaming with HLS from OBS .
The encoding is run ok , but my livestream output in my web got black screen and still have the sound . i tried many ways to fix my issue but i cant . just helping me .
THIS IS MY NGINX CONFIG :

  


  rtmp {
    server {
        listen 1935;
        chunk_size 4000;
        application live {
            live on;
            on_publish http://auth_sever:8000/auth;
            exec ffmpeg -i rtmp://localhost/live/$name
                        -c:v libx264 -profile:v baseline -b:v 768K -s 640x360 -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 96k rtmp://localhost/show/$name_360
                        -c:v libx264 -profile:v baseline -b:v 1024K -s 960x540 -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 128k rtmp://localhost/show/$name_480
                        -c:v libx264 -profile:v baseline -b:v 1920K -s 1280x720  -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 128k rtmp://localhost/show/$name_720
                       -c:v libx264 -profile:v baseline -b:v 4000K -s 1920x1080 -crf 23 -f flv -c:a aac -ac 1 -strict -2 -b:a 128k rtmp://localhost/show/$name_1080;
        }
        application show {
            live on;
            deny play all; # disable consuming the stream from nginx as rtmp
            hls on;
            hls_path /tmp/hls; 
            hls_nested on;
            hls_fragment 4s; # default is 5s
            hls_playlist_length 60s;
            hls_variant _360 BANDWIDTH=448000;
            hls_variant _480 BANDWIDTH=1152000;
            hls_variant _720  BANDWIDTH=2048000;
            hls_variant _1080 BANDWIDTH=4096000; 
        }
    }
}

http {
    sendfile off;
    tcp_nopush on;
    directio 512;
    default_type application/octet-stream;
    # LOAD-BALANCED
    upstream myapp {
        server localhost:8001;
        server auth_sever:8000;
    }
    server {
        listen 8080 default_server;
        location / {
        proxy_pass http://myapp;
        proxy_set_header Host            $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        }
    }
    server {
        listen 8081;
        location / {
            root /www;
        }
        location /hls {
            types {
                application/vnd.apple.mpegurl m3u8;
                application/octet-stream ts;
            }
            # Disable cache
            add_header 'Cache-Control' 'no-cache';

            # CORS setup
            add_header 'Access-Control-Allow-Origin' '*' always;
            add_header 'Access-Control-Expose-Headers' 'Content-Length';

            # allow CORS preflight requests
            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Content-Type' 'text/plain charset=UTF-8';
                add_header 'Content-Length' 0;
                return 204;
            }
            root /tmp;
        }
    }
}


  


  THIS MY DOCKERFILE CONFIG :

  


  FROM tiangolo/nginx-rtmp
RUN apt-get -y update
RUN apt-get -y upgrade
RUN apt-get install -y ffmpeg
COPY nginx.conf /etc/nginx/nginx.conf
COPY index.html /www/


  


  THE LAST , SORRY , MY ENG IS NOT GOOD ! thank for helping !

  


• in FFMPEG_AVAILABLE,How to insert a black frame in avpicture_fill if the frame is not available [on hold]

  22 août 2018, par Vidhi Patel

  This code should work :

  avpicture_fill((AVPicture*) picture, (tUInt8*) this->ptrOVL->get_pOutputDataOVL(), PIX_FMT_BGR24, c->width, c->height);

  but as the title says : what if the frame isn’t available ?