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• lavc : Drop exporting 2-pass encoding stats

  30 novembre 2015, par Vittorio Giovara

  lavc : Drop exporting 2-pass encoding stats
  These variables are coming from mpegvideoenc where are supposedly used
  
  as bit counters on various frame properties. However their use is
  
  unclear as they lack documentation, are available only from a very small
  
  subset of encoders, and they are hardly used in the wild. Also frame_bits
  
  in aacenc is employed in a similar way.
  Remove this functionality from AVCodecContex, these variable are mostly
  
  frame properties, and too few encoders support setting them with anything
  
  useful.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/aacenc.c
  • [DBH] libavcodec/avcodec.h
  • [DBH] libavcodec/mpegvideo_enc.c
  • [DBH] libavcodec/options_table.h
  • [DBH] libavcodec/version.h

• Can't process RTP video stream from Firefox browser or Python based scripts by FFMPEG

  3 avril 2023, par Gentelam.S

  Any time I want to process (forward, analyze, copy, ...) RTP video stream from FF browser or python based scripts by FFMPEG, it "chucks" and can't work with it. Seems to be stream encoding issue.
I have a Janus server where clients join from browsers or anothers services, like Python, then I forward the stream to the URL, where FFMPEG is listening on. There is no issue when I try to process any forwarded stream coming from Chrome based browsers, but the problem occurs when I join from FF or Python.

  


  I run ffmpeg in Ubuntu container.
The command I use :
-loglevel trace -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp -i port4000.sdp -vf scale=1280:720 -vcodec libx264 -profile:v baseline -preset:v ultrafast -acodec aac -f flv -flvflags no_duration_filesize {{rtmpUrl}}

  


  I used also very simple commands like the following but the result is the same :
ffmpeg -protocol_whitelist file,udp,rtp -i ./SDP/port4000.sdp -c copy -t 10 -y test.mkv

  


  The SDP file I use :

  


  SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 58.29.100
m=video 4000 RTP/AVP 96
b=AS:200
a=rtpmap:96 VP8/90000


  


  The screens below depicts how FFMPEG behaves in case of FF and Chrome (loglevel of ffmpeg set to trace).

  


  Firefox :
enter image description here

  


  Chrome :
enter image description here

  


  enter image description here

  


  enter image description here

  


  enter image description here

  


  It looks like it brokes after the following log : Before avformat_find_stream_info() pos: xxx

  


  (Same problem is if I try to run ffprobe)
Thank you for any suggestion.

  


  As described above, I tried quite a lot of of arguments running ffmpeg, different SDP files but seems to be not enough. I want the stream to be procced properly by FFMEPG.

  


• Streaming jpegs to a video on my server

  2 décembre 2013, par Andrew Simpson

  I found a solution to my problem IF I was using a Linux/UNIX machine. It is FFServer from the tools from FFMPEG.

  I had been using FFMPEG on my client Winform Desktop C# to convert jpegs into an OGG video file for playback.

  I have now been tasked with uploading the jpegs to my server and rendering it as a video.

  Optimum, I would start an FFMPEG process on my client PC and supply its stdin with jpegs in byte array format. I have achieved this (I have looked around) but is there a way to redirect the stdoutput to my server that can be picked up by my code on the server and render in real-time to my web User ?

  I have looked on the ffmpeg web site but I am unsure how to 'fit' it in with my process.

  This is my code so far :

      public byte[] EncodeAndUploadImages(string _args1, string _fn)  
  
      {
  
          byte[] _data = null;
  
          try
  
          {
  
              clientBuild = new Process();
  
              clientBuild.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
  
              clientBuild.StartInfo.Arguments = " -f mjpeg -r 30 -i - -c:v libtheora -q:v 7 -r 30 -f ogg -";
  
              clientBuild.StartInfo.FileName = Environment.CurrentDirectory + @"\ffmpeg.exe";
  
              clientBuild.StartInfo.UseShellExecute = false;
  
              clientBuild.StartInfo.RedirectStandardOutput = true;
  
              clientBuild.StartInfo.RedirectStandardError = true;
  
              clientBuild.StartInfo.RedirectStandardInput = true;
  
              clientBuild.StartInfo.CreateNoWindow = true;
  
              clientBuild.StartInfo.LoadUserProfile = false;
  
              clientBuild.EnableRaisingEvents = true;    
  
              clientBuild.Start();
  
  
  
              using (BinaryWriter bw = new BinaryWriter(clientBuild.StandardInput.BaseStream))
  
              {
  
                 //I am simulating a stream of jpegs coming in////////////////
  
                  for (int i = 1; i < 20; i++)
  
                  {
  
                      using (MemoryStream ms = new MemoryStream())
  
                      {
  
                          System.Diagnostics.Debug.Write(i.ToString("00000"));
  
                          Bitmap bmp = new Bitmap("h:\\streamin\\" + i.ToString("00000") + ".jpg");
  
                          bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
  
                          bw.Write(ms.ToArray());                           
  
                          bmp.Dispose();
  
                          ms.Close();
  
                      }
  
                  }
  
                  bw.Close();
  
              }
  
  
  
              // I need some in my ffmpeg arguments to do something here//////   
  
              mStandardOutput = clientBuild.StandardOutput.BaseStream;
  
              mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
              clientBuild.WaitForExit();
  
              _data = mStandardOutputMs.ToArray();
  
              mStandardOutput.Close();
  
          }
  
          catch (Exception _ex)
  
          {
  
  
  
          }
  
          finally
  
          {
  
              clientBuild.Dispose();
  
          }
  
          return _data;
  
      }

  Thanks