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• Build Live Audio Stream Player

  5 décembre 2011, par Kurt

  For an internship project i've been trying to develop a simple audio player for audio live stream.

  Currently i'm using a homemade three buffering (of 1/3 s each) solution played by QAudioOutput, which recall himself after finished his reading.

  void VideoServer::getBuf(QBuffer * p_buf)
  
  {
  
      audio_chunk*    ac = NULL;
  
      std::vector v;
  
  
  
      v.clear();
  
      for (int i = 0; i < 20;)
  
      {
  
          ac = _audioPreviewSharedData->deQueueAudio();
  
          if (ac)
  
          {
  
              v.insert(v.end(), ac->v_buf.begin(), ac->v_buf.end());
  
              i++;
  
              delete ac;
  
          }
  
          else
  
              usleep(50000);
  
      }
  
      p_buf->close();
  
      p_buf->setData((const char *)(&v[0]), v.size()*2);
  
      p_buf->open(QIODevice::ReadOnly);
  
  }

  -

  void VideoServer::slot_launchAudioPreviewBuffering()
  
  {
  
      getBuf(_buf1);
  
      getBuf(_buf2);
  
      _state = 2;
  
      connect(_audioPreviewTimer, SIGNAL(timeout()), this, SLOT(slot_audioPreviewBuffering()));
  
      _audioPreviewTimer->start(0);
  
      connect(_audioOut, SIGNAL(stateChanged(QAudio::State)), this, SLOT(finishedPlaying(QAudio::State)));
  
  }

  -

  void VideoServer::finishedPlaying(QAudio::State state)
  
  {
  
      if(state == QAudio::IdleState) {
  
          slot_audioPreviewBuffering();
  
      }
  
  }

  -

  void VideoServer::slot_audioPreviewBuffering()
  
  {
  
      switch (_state) {
  
      case 0:
  
          {
  
              _audioOut->start(_buf2);
  
              getBuf(_buf1);
  
              _state = 1;
  
              break;
  
          }
  
      case 1:
  
          {
  
              _audioOut->start(_buf3);
  
              getBuf(_buf2);
  
              _state = 2;
  
              break;
  
          }
  
      case 2:
  
          {
  
              _audioOut->start(_buf1);
  
              getBuf(_buf3);
  
              _state = 0;
  
              break;
  
          }
  
      }
  
  }

  But i'm suffering of choppy sound (little interruption between audio chunk).

  How to play this flux without interruption () and with a reasonable delay between audio and video (less 1s) ? Is there a best way ? Am i doing wrong ?

  Thank you !

• Live stream playing

  20 décembre 2011, par John Smith

  well, I can capture the incoming stream. Its produced by FFMpeg. The php code Im doing it with :

  $address = '127.0.0.1';
  
  $port = 1234;
  
  $outfile = "output.flv";
  
  
  
  $ofp = fopen($outfile, 'w');
  
  
  
   if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"; sleep (5); die; }
  
   if (socket_bind($sock, $address, $port) === false) { echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (socket_listen($sock, 5) === false) { echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (($msgsock = socket_accept($sock)) === false) { echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); break; }
  
   do {
  
      $a = '';
  
      socket_recv ($msgsock, $a, 65536, MSG_WAITALL);
  
      fwrite ($ofp, $a);
  
      echo strlen($a);
  
   } while (true);

  so it produces good file, if I replay this it looks good. But I want to stream it on a site, if I just put a link to the .flv, it would play it from the beginning. How to make it real live ? Thanx in advance.

• transcode segment files without stutter for http live streaming

  28 juillet 2015, par zerocap

  I segmented a multicast video stream into small ts files for my HTTP live streaming service and it worked quite well. Then I found the bitrate of the source was too high (1.5mbps) so I set up a background job to transcode the ts files to a smaller bitrate (500kbps) using FFmpeg. The problem is that the 500k .m3u8 playback stutters(on every new file’s loading) and is not as smooth as the 1.5mbps one.

  My transcoding command line is like following :

  ffmpeg -i /home/rca/tst.ts -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -vcodec libx264 -b 500k /home/rca/tst.ts

  Any ideas for this ? Thank you !