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• How to display multiple rtmp streams from Gryphon nginx ?

  22 août 2018, par LoukMo

  CONTEXT :

  -I received a rtsp stream link from an onvif ip camera.

  -The camera can only host 5 streaming connection at a time (I want/need more connections).

  -I’ve been informed that a combination of ffmpeg (to convert the rtsp stream to rtmp) and nginx (to redistribute as many streams as I want) would do what I want.

  -I’m on Windows 10.

  -I downloaded ffmpeg from this source and nginx from this source (nginx 1.7.11.3 Gryphon.zip).

  -Here’s the conf file of the nginx server :

  user nobody;
  
  worker_processes 1;
  
  
  
  events {
  
    worker_connections  1024;
  
  }
  
  
  
  rtmp {
  
          server {
  
                  listen 1935;
  
                  chunk_size 4096;
  
  
  
                  application live {
  
                          live on;
  
                          record off;
  
                  }
  
          }
  
  }

  -I’m using this command to push my camera’s stream to the nginx server :

  ffmpeg -hide_banner -i "rtsp://user:password123@192.168.10.116:554/videoMain" -an -f flv -rtmp_live live "rtmp://127.0.0.1:1935/live"

  -I can then see the output stream using vlc’s open network stream tool (rtmp ://127.0.0.1:1935/live)

  QUESTION :

  Is there a way to have multiple input/outout streams at the same time ?

  I want to have multiple cameras redirected at the same time by one server...

  

• Catching ffmpeg stream in C# interrupts after a few seconds

  15 septembre 2017, par Chris

  I want to catch an ip-cam stream with ffmpeg in c# and send it with asp.net mvc web api to a client.
  As a client I use also ffmpeg to test the api call.

  In my api controller I call the ffmpeg.exe with the proper arguments.

  string argumentString = $"-i rtsp://{_user}:{_password}@{_ipAddress}/12 -nostdin -vcodec copy -f h264 pipe:1";
  
  ProcessStartInfo startinfo = new ProcessStartInfo(HostingEnvironment.MapPath("~/App_Data/ffmpeg.exe"), argumentString);

  As you can see I am ignoring the standard input (-nostdin) and use the standard output to output the data (pipe:1).

  But the client is always closing the connection after a few seconds (12-14).

  Here the error message on the server (ASP.NET) :

  

  And here the error message on the client (ffmpeg)

  

  I tried several ways to catch the ip-cam stream.

  Via the event OutputDataReceived :

  public HttpResponseMessage Get()
  
  {
  
      HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK)
  
      {
  
          Content = new PushStreamContent((stream, content, context) =>
  
          {
  
              Process ffmpeg = new Process();
  
              string argumentString = $"-i rtsp://{_user}:{_password}@{_ipAddress}/12 -nostdin -vcodec copy -f h264 pipe:1";
  
              ProcessStartInfo startinfo = new ProcessStartInfo(HostingEnvironment.MapPath("~/App_Data/ffmpeg.exe"), argumentString);
  
              startinfo.RedirectStandardError = true;
  
              startinfo.RedirectStandardOutput = true;
  
              startinfo.RedirectStandardInput = true;
  
              startinfo.UseShellExecute = false;
  
              startinfo.CreateNoWindow = true;
  
  
  
              ffmpeg.StartInfo = startinfo;
  
              ffmpeg.ErrorDataReceived += (s, e) =>
  
              {
  
                  Debug.WriteLine(e.Data);
  
              };
  
  
  
              StreamWriter writer = new StreamWriter(stream);                    
  
              ffmpeg.OutputDataReceived += (s, e) =>
  
              {
  
                  writer.Write(e.Data);
  
              };
  
              ffmpeg.Start();
  
              ffmpeg.BeginOutputReadLine();
  
              ffmpeg.BeginErrorReadLine();
  
              ffmpeg.WaitForExit();
  
  
  
          }, new MediaTypeHeaderValue("video/mp4")),
  
      };
  
      return result;
  
  }

  I also tried to do it without a StreamWriter, with every possible Encoding :

  ffmpeg.OutputDataReceived += (s, e) =>
  
  {
  
      byte[] toBytes = Encoding.BigEndianUnicode.GetBytes(e.Data);
  
      stream.Write(toBytes, 0, toBytes.Length);
  
      stream.Flush();
  
  };

  Via the underlying stream from StandardOutput :

  public HttpResponseMessage Get()
  
  {
  
      HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK)
  
      {
  
          Content = new PushStreamContent((stream, content, context) =>
  
          {
  
              Process ffmpeg = new Process();
  
              string argumentString = $"-i rtsp://{_user}:{_password}@{_ipAddress}/12 -nostdin -vcodec copy -f h264 pipe:1";
  
              ProcessStartInfo startinfo = new ProcessStartInfo(HostingEnvironment.MapPath("~/App_Data/ffmpeg.exe"), argumentString);
  
              startinfo.RedirectStandardError = true;
  
              startinfo.RedirectStandardOutput = true;
  
              startinfo.RedirectStandardInput = true;
  
              startinfo.UseShellExecute = false;
  
              startinfo.CreateNoWindow = true;
  
  
  
              ffmpeg.StartInfo = startinfo;
  
              ffmpeg.Start();
  
  
  
              byte[] buffer = new byte[512];
  
              int length = 0;
  
              while ((length = ffmpeg.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length)) > 0)
  
              {
  
                  stream.Write(buffer, 0, length);
  
                  stream.Flush();
  
              }
  
  
  
          }, new MediaTypeHeaderValue("video/mp4")),
  
      };
  
      return result;
  
  }

  But the result is always the same.

  When I do not send the data to the client it is working fine :

  public HttpResponseMessage Get()
  
  {
  
      HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK)
  
      {
  
          Content = new PushStreamContent((stream, content, context) =>
  
          {
  
              Process ffmpeg = new Process();
  
              string argumentString = $"-i rtsp://{_user}:{_password}@{_ipAddress}/12 -nostdin -vcodec copy -f h264 pipe:1";
  
              ProcessStartInfo startinfo = new ProcessStartInfo(HostingEnvironment.MapPath("~/App_Data/ffmpeg.exe"), argumentString);
  
              startinfo.RedirectStandardError = true;
  
              startinfo.RedirectStandardOutput = true;
  
              startinfo.RedirectStandardInput = true;
  
              startinfo.UseShellExecute = false;
  
              startinfo.CreateNoWindow = true;
  
  
  
              ffmpeg.StartInfo = startinfo;
  
              ffmpeg.Start();
  
  
  
              byte[] buffer = new byte[512];
  
              int length = 0;
  
              while ((length = ffmpeg.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length)) > 0)
  
              {
  
                  //stream.Write(buffer, 0, length);
  
                  //stream.Flush();
  
              }
  
  
  
          }, new MediaTypeHeaderValue("video/mp4")),
  
      };
  
      return result;
  
  }

  So what is wrong with my code ?

• Generate VTT pixel flat image with coordinates

  27 novembre 2022, par Alex Malin

  I have a question.

  


  I want to know if they have any options to create webVTT horizontal images with FFmpeg
like an attached image tack one pixel/two every second and create one horizontal image with coordinates.

  


  Thank you.

  


  

  


  WEBVTT 


  


  00:00.000 —> 00:08.000
/assets/thumbnails-01.jpg#xywh=0,0,160,90

  


  00:09.000 —> 00:16.000
/assets/thumbnails-01.jpg#xywh=160,0,320,90