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• my ffmpeg stops streaming after a few seconds

  15 février 2015, par Andrew Simpson

  This is all new to me.

  I am using ffmpeg in my c# desktop app.

  The idea is to use the Process under C# to start ffmpeg on the DOS prompt.

  I then parse each bit of data to ’split’ off my jpegs.

  But after a few seconds the feed just stops.

  This is my code :

   private void button1_Click(object sender, EventArgs e)
  
      {
  
          try
  
          {
  
              Process process = new Process();
  
              FileStream baseStream = null;
  
  
  
              string arguments = @" -i rtsp://admin:admin@192.168.0.8:554/video_1 -an -f image2pipe -vf fps=fps=6 -qscale 0 -";
  
              string file = @"C:\bin\ffmpeg.exe";
  
              process.StartInfo.FileName = file;
  
              process.StartInfo.Arguments = arguments;
  
              process.StartInfo.CreateNoWindow = true;
  
              process.StartInfo.RedirectStandardError = true;
  
              process.StartInfo.RedirectStandardOutput = true;
  
              process.StartInfo.UseShellExecute = false;
  
  
  
              Task.Run(() =>
  
              {
  
                  try
  
                  {
  
                      process.Start();
  
                      byte[] buffer = new byte[200000];
  
                      //var error = process.StandardError.ReadToEnd();
  
                      //var error = process..ReadToEnd();
  
  
  
                      baseStream = process.StandardOutput.BaseStream as FileStream;
  
                      bool gotHeader = false;
  
                      bool imgFound = false;
  
                      int counter = 0;
  
                      while (true)
  
                      {
  
                          byte bit1 = (byte)baseStream.ReadByte();
  
                          buffer[counter] = bit1;
  
  
  
                          if (bit1 == 217 && gotHeader)
  
                          {
  
                              if (buffer[counter - 1] == 255)
  
                              {
  
                                  byte[] jpeg = new byte[counter];
  
                                  Buffer.BlockCopy(buffer, 0, jpeg, 0, counter);
  
                                  using (MemoryStream ms = new MemoryStream(jpeg))
  
                                  {
  
                                      pictureBox1.Image = Image.FromStream(ms);
  
                                      ms.Close();
  
                                  }
  
                                  imgFound = true;
  
                              }
  
                          }
  
                          else if (bit1 == 216)
  
                          {
  
                              if (buffer[counter - 1] == 255)
  
                              {
  
                                  gotHeader = true;
  
                              }
  
                          }
  
                          if (imgFound)
  
                          {
  
                              counter = 0;
  
                              buffer = new byte[200000];
  
                              imgFound = false;
  
                              gotHeader = false;
  
                          }
  
                          else
  
                          {
  
                              counter++;
  
                          }
  
                      }
  
                  }
  
                  catch (Exception ex2)
  
                  {
  
                      //log error here
  
                  }
  
              });
  
          }
  
          catch (Exception ex)
  
          {
  
              //log error here
  
          }
  
      }

  Like I said it works but then just stops.

  Is there something I should be mindful of ?
  Also, is there way to receive any errors.
  Finally, is there a was to specify the quality of the jpeg ?

  thanks

• FFMpeg Image2Pipe VB.net

  17 février 2019, par Zakir_SZH

  i m trying to pipe image from my code to ffmpeg.. i am using flowing code :

  but it does not working, produced video is not playable :(

      Dim proc As Process = New Process()
  
      Dim objStream As System.IO.Stream
  
      proc.StartInfo.FileName = strAPPPath & "\ffmpeg.exe"
  
      proc.StartInfo.Arguments = "-f image2pipe -i pipe:.bmp -crf 25.0 -vcodec libx264 -acodec libvo_aacenc -vf scale=1280:720 -ar 48000 -b:a 160k -coder 1 -rc_lookahead 60 -threads 0 -an out_vid.mp4"
  
      proc.StartInfo.UseShellExecute = False
  
      proc.StartInfo.RedirectStandardInput = True
  
      proc.StartInfo.RedirectStandardOutput = True
  
      proc.StartInfo.RedirectStandardError = True
  
      proc.Start()
  
      objStream = proc.StandardInput.BaseStream
  
      For i As Integer = 0 To 75 - 1
  
          Using img As System.Drawing.Image = Image.FromFile(strAPPPath & "\IMG\1033_WebImage.jpg")
  
              img.Save(objStream, System.Drawing.Imaging.ImageFormat.Bmp)
  
          End Using
  
          objStream.Flush()
  
      Next
  
      objStream.Close()
  
      proc.WaitForExit()

  so, what i am missing here ?

  best regards

• When streaming response in Flask file unplayable

  21 décembre 2015, par nadermx

  I currently have a function that runs ffmpeg enconder on a flv stream from youtube.

  def console(cmd, add_newlines=False):
  
      p = Popen(cmd, shell=True, stdout=PIPE)
  
      while True:
  
          data = p.stdout.readline()
  
          if add_newlines:
  
              data += str('\n')
  
          yield data
  
  
  
          p.poll()
  
          if isinstance(p.returncode, int):
  
              if p.returncode > 0:
  
                  # return code was non zero, an error?
  
                  print 'error:', p.returncode
  
              break

  This works fine when I run the ffmpeg command and have it output to a file. The file is playable.

  mp3 = console('ffmpeg -i "%s" -acodec libmp3lame -ar 44100 -f mp3 test.mp3' % video_url, add_newlines=True)

  But when I have ffmpeg output to stdout via - instead of test.mp3, and stream that response. The file streams fine, is the correct size. But does not play correctly. Sounds chopy, and when I check the properties of the file it doesn’t show the data of it as it does with test.mp3

  @app.route('/test.mp3')
  
  def generate_large_mp3(path):
  
      mp3 = console('ffmpeg -i "%s" -acodec libmp3lame -ar 44100 -f mp3 -' % video_url, add_newlines=True)
  
      return Response(stream_with_context(mp3), mimetype="audio/mpeg3",
  
                     headers={"Content-Disposition":
  
                                  "attachment;filename=test.mp3"})

  Is there something I am missing ?