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• FFmpeg API example (encode_video.c) does not work correctly

  30 janvier 2023, par NewbieCoder

  I am using the official encode_video.c example to test if FFmpeg works correctly for me. 
I got the pre-built windows edition from ffmpeg.zeranoe.com/builds. It is built already with libx264 and other external libraries. I got both dev and shared editions and added the DLLs, header files and libs accordingly in Visual Studio.

  



  Now the encode_video.c example does not work correctly.

  



  



  What I tried :

  



  I compiled the example and run it on many different file formats and codecs such as the following.

  



  First I tried all of these file formats (.mp4, .m4v, .h264, .x264, .avi, .flv) with codec name as libx264. The code executed without errors but the output video file did not play in VLC or Windows 10 default player.

  



  Next, I tried all of those above file formats but with codec name as mpeg4. The code executed without errors but the output video file played only for .m4v in VLC.

  



  



  What is expected :

  



  All of those combinations should have produced a video file which could be played in VLC. None of them worked except for .m4v as file format and mpeg4 as codec name.

  



  



  Please tell me how to make this work for h264. I mainly want it to work for h264 as that is only important for now.

  



  I am running the code like ./encode_video.exe test.mp4 libx264 where first argument is output filename and second argument is codec name.

  



  This is the output for test.mp4 and libx264 as command line arguments https://imgur.com/a/AHLQwuK

  



  It seems that in the encode function, it goes over the below code and returns because of AVERROR(EAGAIN) or AVERROR_EOF. Please tell me what is happening.

  



  while (ret >= 0) {
        ret = avcodec_receive_packet(enc_ctx, pkt);
        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
            return;
        else if (ret < 0) {
            fprintf(stderr, "Error during encoding\n");
            exit(1);
        }

        printf("Write packet %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
        fwrite(pkt->data, 1, pkt->size, outfile);
        av_packet_unref(pkt);
    }


  



  I used DepenciesGUI to find out the DLLs linked and it shows that the DLLs are correctly linked. Please help me figure out what the problem is now !!

  


• nginx : [emerg] invalid port in url "http://192.168.0.100:80/live" in nginx.conf - Restreaming OBS to LAN

  17 novembre 2018, par popek069

  I want to restream OBS to LAN. So I set up nginx server. The server receive stream from OBS using RTMP and restreams it to HTTP to view from another device.
  Streaming from OBS works, but when I start nginx I get an error

  PS C:\Users\popek\Downloads\nginx> .\nginx.exe -s reload
  
  nginx: [emerg] invalid port in url "http://192.168.0.100:80/live" in C:\Users\popek\Downloads\nginx/conf/nginx.conf:187

  I’m new to nginx and I’m running Windows 10, nginx server and OBS are on the same pc with ip 192.168.0.100
  I’d like to also reencode stream using ffmpeg if it’s possible. I know ffmpeg, I don’t know only how to set input and output.

  Config : (nginx.conf)

  #user  nobody;
  
  # multiple workers works !
  
  worker_processes  2;
  
  
  
  #error_log  logs/error.log;
  
  #error_log  logs/error.log  notice;
  
  #error_log  logs/error.log  info;
  
  
  
  #pid        logs/nginx.pid;
  
  
  
  
  
  events {
  
      worker_connections  8192;
  
      # max value 32768, nginx recycling connections+registry optimization = 
  
      #   this.value * 20 = max concurrent connections currently tested with one worker
  
      #   C1000K should be possible depending there is enough ram/cpu power
  
      # multi_accept on;
  
  }
  
  
  
  
  
  http {
  
      #include      /nginx/conf/naxsi_core.rules;
  
      include       mime.types;
  
      default_type  application/octet-stream;
  
  
  
      #log_format  main  '$remote_addr:$remote_port - $remote_user [$time_local] "$request" '
  
      #                  '$status $body_bytes_sent "$http_referer" '
  
      #                  '"$http_user_agent" "$http_x_forwarded_for"';
  
  
  
      #access_log  logs/access.log  main;
  
  
  
  #     # loadbalancing PHP
  
  #     upstream myLoadBalancer {
  
  #         server 127.0.0.1:9001 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9002 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9003 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9004 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9005 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9006 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9007 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9008 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9009 weight=1 fail_timeout=5;
  
  #         server 127.0.0.1:9010 weight=1 fail_timeout=5;
  
  #         least_conn;
  
  #     }
  
  
  
      sendfile        off;
  
      #tcp_nopush     on;
  
  
  
      server_names_hash_bucket_size 128;
  
  
  
  ## Start: Timeouts ##
  
      client_body_timeout   10;
  
      client_header_timeout 10;
  
      keepalive_timeout     30;
  
      send_timeout          10;
  
      keepalive_requests    10;
  
  ## End: Timeouts ##
  
  
  
      #gzip  on;
  
  
  
      server {
  
          #listen       80;
  
          server_name  localhost;
  
  
  
          #charset koi8-r;
  
  
  
          #access_log  logs/host.access.log  main;
  
  
  
          ## Caching Static Files, put before first location
  
          #location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
  
          #    expires 14d;
  
          #    add_header Vary Accept-Encoding;
  
          #}
  
  
  
  # For Naxsi remove the single # line for learn mode, or the ## lines for full WAF mode
  
          location / {
  
              #include    /nginx/conf/mysite.rules; # see also http block naxsi include line
  
              ##SecRulesEnabled;
  
                ##DeniedUrl "/RequestDenied";
  
                ##CheckRule "$SQL >= 8" BLOCK;
  
                ##CheckRule "$RFI >= 8" BLOCK;
  
                ##CheckRule "$TRAVERSAL >= 4" BLOCK;
  
                ##CheckRule "$XSS >= 8" BLOCK;
  
              root   html;
  
              index  index.html index.htm;
  
          }
  
  
  
  # For Naxsi remove the ## lines for full WAF mode, redirect location block used by naxsi
  
          ##location /RequestDenied {
  
          ##    return 412;
  
          ##}
  
  
  
  ## Lua examples !
  
  #         location /robots.txt {
  
  #           rewrite_by_lua '
  
  #             if ngx.var.http_host ~= "localhost" then
  
  #               return ngx.exec("/robots_disallow.txt");
  
  #             end
  
  #           ';
  
  #         }
  
  
  
          #error_page  404              /404.html;
  
  
  
          # redirect server error pages to the static page /50x.html
  
          #
  
          error_page   500 502 503 504  /50x.html;
  
          location = /50x.html {
  
              root   html;
  
          }
  
  
  
          # proxy the PHP scripts to Apache listening on 127.0.0.1:80
  
          #
  
          #location ~ \.php$ {
  
          #    proxy_pass   http://127.0.0.1;
  
          #}
  
  
  
          # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
  
          #
  
          #location ~ \.php$ {
  
          #    root           html;
  
          #    fastcgi_pass   127.0.0.1:9000; # single backend process
  
          #    fastcgi_pass   myLoadBalancer; # or multiple, see example above
  
          #    fastcgi_index  index.php;
  
          #    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
  
          #    include        fastcgi_params;
  
          #}
  
  
  
          # deny access to .htaccess files, if Apache's document root
  
          # concurs with nginx's one
  
          #
  
          #location ~ /\.ht {
  
          #    deny  all;
  
          #}
  
      }
  
  
  
  
  
      # another virtual host using mix of IP-, name-, and port-based configuration
  
      #
  
      #server {
  
      #    listen       8000;
  
      #    listen       somename:8080;
  
      #    server_name  somename  alias  another.alias;
  
  
  
      #    location / {
  
      #        root   html;
  
      #        index  index.html index.htm;
  
      #    }
  
      #}
  
  
  
  
  
      # HTTPS server
  
      #
  
      #server {
  
      #    listen       443 ssl spdy;
  
      #    server_name  localhost;
  
  
  
      #    ssl                  on;
  
      #    ssl_certificate      cert.pem;
  
      #    ssl_certificate_key  cert.key;
  
  
  
      #    ssl_session_timeout  5m;
  
  
  
      #    ssl_prefer_server_ciphers On;
  
      #    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  
      #    ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:ECDH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!eNULL:!MD5:!DSS:!EXP:!ADH:!LOW:!MEDIUM;
  
  
  
      #    location / {
  
      #        root   html;
  
      #        index  index.html index.htm;
  
      #    }
  
      #}
  
  
  
  }
  
  
  
  
  
  rtmp {
  
          server {
  
                  listen 1935;
  
                  chunk_size 4096;
  
  
  
                  application live {
  
                          live on;
  
                          record off;
  
                          hls on;
  
                          push http://192.168.0.100:80/live ;
  
                  }
  
          }
  
  }

• Best intra-frame codec for editing ? Having color issues with DNxHR and serious sync issues with Prores

  23 janvier 2020, par Raulo1985

  I have a couple of questions regarding intra-frame codecs for editing purposes (in Premiere Pro).

  A LITTLE CONTEXT :

  I ripped a HDR movie to a MP4 container some months ago, using H.264 as codec (high 10, level 5, UHD, YUV, subsampling 4:2:0). The video looks great, as it should. Now I want to edit a trailer for that movie (I edit in Adobe Premiere Pro, current version), and for fast playback I need to work with proxies or transcode the source file to an intra-frame non long GOP file and use it as the source file (hopefully as lossless as that transcoding step can be). I tried for several days to transcode the source file to DNxHR 444 10 bits (using FFmpeg and then Adobe Media Encoder), but the result was always a video with the colors messed up (sometimes very washed out, sometimes over saturated).

  FFprobe of the resulting DNxHR file said that the color space was BT709 (source file is obviously BT2020), and I don’t know why. The transcoding involved upsampling since the source file is 4:2:0 and DNxHR doesn’t support it, but I tried upsampling to 4:4:4 and also to 4:2:2, and both of those files looked exactly the same to me, and very different from the original footage (so, I don’t think upsampling is the cause of the color issue, but maybe the apparent color space change or something wrong with the metadata). The results were the same when transcoding with Adobe Media Encoder. Anyway, I seem to have given up transcoding to DNxHR and use it as the source file, unless someone has an idea of what’s causing this problem. I could have worked with the source file for exporting and DNxHR LB for proxies, but there were sync issues (between source file and proxy) that defeated all purposes while editing. Prores is out of the picture, sync issues were worse (several seconds of delay).

  For the record, the command used that didn’t work as expected (color wise) is :

  ffmpeg -channel_layout 63 -i input.mkv -map 0:0 -c:v dnxhd -vf "scale=in_range=limited:out_range=full" -color_range 2 -profile:v dnxhr_444 -pix_fmt yuv444p10le -acodec pcm_s24le -ar 48000 -ac 6 -channel_layout 63 -map 0:2 -hide_banner output.mxf

  I also tried without the commands "scale=in_range=limited:out_range=full" and "-color_range 2", with same results. Always used FFmpeg latest version, and I’m working in Windows 10 Pro, latest drivers and latest Klite codec pack. Video files were compared with Mediainfo, FFprobe, and visually with VLC.

  Well, like I said, I’m giving up using DNxHR as the source file for my project (it would have been ideal since it doesn’t have sync issues with the DNxHR proxies, and file size is not a problem for me). A user here at the forums suggested transcoding and use H.264 intra-frame as source file, which I didn’t know was an option (I didn’t know H.264 was capable of intra-frame, my bad). I’m aware that one should avoid unnecesary transcoding steps, but I can’t work with a H.264 UHD HDR source file (ultra slow playback), and the sync issues with proxies, no matter the codec, make it impossible to make accurate cuts.
  So, bottom line, I need to find a way to fix the color issue when transcoding to DNxHR, or try with an inter-frame codec that’s not DNxHR and that’s capable of preserving all the HDR info (and then see if it doesn’t have sync issues. I’m assuming that those may dissapear when using intra-frame for both source file and proxies).

  NOTE : When importing the DNxHR 444 file to Premiere Pro and looking at the Lumetri scopes tab, you can tell that the colors are clipped at 100 nits, like a regular SDR video. So apparently the color space was really reduced to BT709, and I don’t know why. The H.264 source file behaves as expected, with colors going past 100 nits.

  MY QUESTIONS :

  1) Is H.264 intra-frame a good format for editing with a good playback performance ?

  2) If H.264 intra-frame is a good option, what would be the advantages of the DNxHR codec (or Prores) over it for editing purposes ? Everybody suggests DNxHD/DNxHR or Prores as intermediate codecs, but if intra-frame H.264 has the same advantages for editing and supports HDR, what would be the reason to choose another codec like DNxHR ?

  3) Any ideas on what could be the cause of the colors not transcoding correctly from the H.264 source file to the DNxHR 444 10 bits one ? The command looks ok to me, but FFprobe output says the DNxHR video is BT709, while with the source file it says BT2020. Like I said, apparently there’s something wrong with the transcoding process regarding metadata or color space.

  4) I haven’t tried to transcode the source file to a DNxHR 444 10 bits video file, but in a MOV container. I don’t know how this works internally, but maybe the color issue has something to do with the container metadata or something. I may try this if there’s not another suggestion (transcoding this kind of files, as you know, takes time, so I’ll wait for some ideas first).

  NOTE : I tried to transcode the source file in the same way (DNxHR 444, 10 bits, etc) with Adobe Media Encoder 2020 and the result was the same, with colors messed up and FFprobe saying the video is BT709. Also tried transcoding to DNxHR HQX profile (10 bits), same result.

  Any help would be greatly appreciated.

  Thanks in advance.