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• Is there any way to resume live h264 playback (client rejoin) using the h.264 codec ?

  22 février 2021, par Ice

  Currently, I'm having a bit of an issue with the MediaSource API for resuming live h264 playback.
My server-side code will keep the first packet from FFmpeg, then dispatch it to clients. However, this works well but raises an issue.

  


  When I restart the stream and it dispatches to the client(s), it goes as expected and this is the result I expect when a client disconnects then has to reconnect to the stream, is the aforementioned result

  


  However, if I were to rejoin the stream, I get this as the result

  


  Also, FFMpeg data is being sent to the client in the picture above, it's just not rendering it for some reason.

  


  Here's my function for playing audio/video frames that I get from the server.

  


  private _playFrame(type: 0 | 1) {
    const src = type === 0 ? this.audioSource : this.videoSource;
    if (!src || src.updating) return;
    const queue = type === 0 ? this.audioFrameQueue : this.videoFrameQueue;
    src.appendBuffer(queue.shift());
    if (this.video.src && this.video.paused) this.video.play().then(() => null);
}


  


• How to check if client is still connected with ffmpeg

  11 décembre 2017, par Adalcar

  I am working on a live-streaming server in C++ using FFMPEG.
  I have a I have an acquisition thread which grabs the images from the cameras and I spawn a new thread on each client connexion to send them the packets.

  Here’s my "send" function :

  void Encoder::_encode()
  
  {
  
      int ret = 0;
  
      if (avcodec_send_frame(ctx, frame) < 0)
  
          throw new std::runtime_error("error sending a frame for encoding");
  
      while (ret >= 0)
  
      {
  
          ret = avcodec_receive_packet(ctx, pkt);
  
          if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
  
              return;
  
          avio_write(client, pkt->data, pkt->size);
  
          avio_flush(client);
  
          av_packet_unref(pkt);
  
      }
  
  }

  This encodes the frame and sends it to the client.

  The problem is : whenever the client exits, the thread keeps sending it data, and throws no exception, even when the same client connects again, it will spawn a new thread while the old one keeps running...
  Is there a way to "ping" the client to check whether it is still connected ?

• Calling FFMPEG Commands via Windows Service

  2 février 2017, par Kubi

  I have a windows service and I checked the "Allow service to interact with desktop" checkbox in LogOn tab. However, I still can not call my batch file which is a basic command app to run the ffmpeg commands to transcode some videos in my application. (I’m sending arguments as well)

  I checked the logs in Process Monitor but everything seems fine when I filter it with MyServiceName.exe. All threads are looking fine but the service can not even start the command file.

  If I can not find a solution for this, I’m going to create another service and communicate with each other about the transcoding process, But I’m looking for a way to find the exact problem here.

          BinaryPath = @"c:\Transcoder\ServiceConsole.exe";
  
          //create a process info
  
          ProcessStartInfo oInfo = new ProcessStartInfo(BinaryPath, " /readfromfile command.txt");
  
          oInfo.UseShellExecute = false;
  
          oInfo.CreateNoWindow = true;
  
          oInfo.RedirectStandardOutput = true;
  
          oInfo.RedirectStandardError = true;
  
          string output = null; StreamReader srOutput = null;
  
  
  
          try
  
          {
  
              Process proc = System.Diagnostics.Process.Start(oInfo); 
  
  
  
              proc.WaitForExit();
  
  
  
              //get the output
  
              srOutput = proc.StandardError;
  
  
  
              //now put it in a string
  
              output = srOutput.ReadToEnd();
  
  
  
              proc.Close();
  
          }