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• How can I get audio in my ffmpeg stream to nginx rtmp server ?

  26 novembre 2013, par Conor Patrick

  I currently have a nginx server setup with the rtmp plugin for video streaming. I'm streaming to it with ffmpeg and then displaying the stream on a web browser with adobe flash player.

  I have the video streaming successfully but I have not been able to get audio.

  This is the ffmpeg command I use to start the stream

  ffmpeg -f video4linux2 -s 320x240 -r 16 -i /dev/video0 -f alsa -i hw:0 -an -f flv rtmp://123.456.789.51:31002/rover/mystream

  The stream then goes to nginx which is running on this conf file

  worker_processes  1;
  
  
  
  error_log  logs/user/error.log debug;
  
  
  
  events {
  
      worker_connections  1024;
  
  }
  
  
  
  rtmp {
  
      server {
  
          listen 31002;
  
  
  
          application rover {
  
              live on;
  
              #meta copy;
  
              #interleave on;
  
              allow publish all;
  
              allow play all;
  
  
  
              hls on;
  
              #record keyframes;
  
              #record_path /tmp;
  
              #record_max_size 128K;
  
              #record_interval 30s;
  
              #record_suffix .this.is.flv;
  
  
  
              #on_publish http://localhost:8080/publish;
  
              #on_play http://localhost:8080/play;
  
              #on_record_done http://localhost:8080/record_done;
  
          }
  
      }
  
  }
  
  
  
  http {
  
      server {
  
          listen      26360;
  
  
  
          location /stat {
  
              rtmp_stat all;
  
              rtmp_stat_stylesheet stat.xsl;
  
          }
  
  
  
          location /stat.xsl {
  
              root nginx-rtmp-module-master/;
  
          }
  
  
  
          location /control {
  
              rtmp_control all;
  
          }
  
  
  
          #location /publish {
  
          #    return 201;
  
          #}
  
  
  
          #location /play {
  
          #    return 202;
  
          #}
  
  
  
          #location /record_done {
  
          #    return 203;
  
          #}
  
  
  
          location /rtmp-publisher {
  
              root /path/to/test;
  
          }
  
  
  
          location / {
  
              root nginx-rtmp-module-master/test/www;
  
          }
  
      }
  
  }

  I then access the stream from a browser using this set up for the adobe flash player and strobe media player.

  Could I get some suggestions as to how I couldn't be getting audio ? I'm streaming video from my webcam and specifying audio from my mic.

• What are the steps required to create a non-NPAPI video decoder plugin - VLC Alternative ?

  26 novembre 2013, par ElHaix

  Google's Say Goodbye to Our Old Friend NPAPI blog post indicates that NPAPI plugin support will cease by the end of 2014 (in favor of PPAPI).

  We have considered the option of using the ffmpeg libraries to create our own video plugin to simply decode RTSP encoded H.264 video streams on the client - important because we need as near real-time video display (avoiding transcoding latency). Using the ffmpeg libraries, there is still a 3-5 second delay in decoding the stream, not as fast as running MPlayer with the -benchmark option.

  In trying Google's PNaCl recommendation, we just got the LOADING status and the following error :

  NativeClient : NaCl module load failed : PnaclCoordinator : Compile
  process could not be created : ServiceRuntime : failed to start

  Are there any other alternatives or suggestions ?

• FFMPEG JNI wrapper causes Android app exit

  5 décembre 2013, par user3043703

  I'm writing a JNI wrapper to use FFMPEG as a library in my Android project. I'm mainly using as references the halfninja project (and some forks) and this useful guide. I'm making a lot of personalizations but I got a working version with some additional codecs, the only problem is that, after FFMPEG ends, it causes my application to quit with no errors and I'd like to avoid this (for example to invoke FFMPEG again). Looking at the halfninja wrapper, the line of code exit(ret) ; from the cmdutils.c file is commented in the function void exit_program(int ret) but if I do the same with the latest (2.1.1) version of FFMPEG it causes me a signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 6f632494 error. My code looks like this :

  void exit_program(int ret)
  
  {
  
     if (program_exit)
  
        program_exit(ret);
  
  
  
     //exit(ret);
  
    //if I uncomment this the app automatically exits without errors
  
  }

  I see that both my references are a little old, also refering to a very old release of FFMPEG and it seems that meanwhile the source code changed a lot. I invoke FFMPEG through the JNI wrapper inserted in a new thread in the application code.

  All I'd like to know is : there's a way to avoid the automatic exit of my application after the end of FFMPEG thread ?