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• Error : spawn process ffmpeg ChildProcessError

  10 juin 2019, par Karnon

  I wanted to make a program like OBS simply.

  My ideal code behavior is to create a child process in Node.js and execute FFMPEG commands to send a webcam stream to yourtube live RTMP server. However, the actual behavior is caused by an error in the child-process-promise module used in node.js.

  I’ve checked several questions, but I don’t have enough experience to understand them, and I hope there’s a clear solution.

  I guess it was because I couldn’t find the command address of FFMPEG in the Node environment. Or is calling from the socket environment a problem ?

  I checked that the FFMPEG command works in a Windows prompt environment.

  ※ Note : FFMPEG environment variables are registered.

  Environment : Window10, node.js, ffmpeg

  The code took advantage of a simple WebSocket example.

  When I first investigated, I thought that the only way to do this was to use "fluent-effmpeg."

  I tried "fluent-ffmpeg" but I couldn’t get my laptop webcam up and running in Windows environments as a parameter for the "fluent-ffmppeg" command.

  I’ve also thought about using WebRTC, but I think it’s not for personal use because it’s a P2P connection. (I also saw how to connect a peer connection to a WebRTC server like Janus, but I didn’t have enough references to understand it.)

  Below is the code of the problem.

  const SocketIO = require("socket.io");
  
  const ffmpeg = require("fluent-ffmpeg");
  
  const spawn = require("child-process-promise").spawn;
  
  
  
  module.exports = server => {
  
    const io = SocketIO(server, { path: "/socket.io" });
  
  
  
    io.on("connection", socket => {
  
      const req = socket.request;
  
      const ip = req.headers["x-forwarded-for"] || req.connection.remoteAddress;
  
      console.log("새로운 클라이언트 접속!", ip, socket.id, req.ip);
  
      socket.on("disconnect", () => {
  
        console.log("클라이언트 접속해제", ip, socket.id);
  
        clearInterval(socket.interval);
  
      });
  
      socket.on("error", error => {
  
        console.error(error);
  
      });
  
      socket.on("reply", data => {
  
        console.log(data);
  
        ffmpeg_command();
  
      });
  
    });
  
  
  
    function ffmpeg_command() {
  
      let arg = [
  
        "-f",
  
        "lavfi",
  
        "-i",
  
        "anullsrc=r=16000:cl=mono",
  
        "-f",
  
        "dshow",
  
        "-ac",
  
        "2",
  
        "-i",
  
        "video='HP Truevision HD'",
  
        "-s",
  
        "1280x720",
  
        "-r",
  
        "10",
  
        "-vcodec",
  
        "libx264",
  
        "-pix_fmt",
  
        "yuv420p",
  
        "-preset",
  
        "ultrafast",
  
        "-r",
  
        "25",
  
        "-g",
  
        "20",
  
        "-b:v",
  
        "2500k",
  
        "-codec:a",
  
        "libmp3lame",
  
        "-ar",
  
        "44100",
  
        "-threads",
  
        "6",
  
        "-b:a",
  
        "11025",
  
        "-bufsize",
  
        "512k",
  
        "-f",
  
        "flv",
  
        "rtmp://a.rtmp.youtube.com/live2/8dfu-69k0-dxyw-896q"
  
      ];
  
      spawn("ffmpeg", arg).catch(e => {
  
        console.log(e);
  
      });
  
    }
  
  };

  Here’s the error : The expected result is that your webcam is working and YouTube live streaming is successful.

  { ChildProcessError: `ffmpeg -f lavfi -i anullsrc=r=16000:cl=mono -f dshow -ac 2 -i video='HP Truevision HD' -s 1280x720 -r 10 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r 25 -g 20 -b:v 2500k -codec:a libmp3lame -ar 44100 -threads 6 -b:a 11025 -bufsize 512k -f flv rtmp://a.rtmp.youtube.com/live2/8dfu-69k0-dxyw-896q` failed with code 1
  
      at ChildProcess.<anonymous> (C:\Users\Tricky\Desktop\Work\ESC\ESC_temp\node_modules\child-process-promise\lib\index.js:132:23)
  
      at ChildProcess.emit (events.js:182:13)
  
      at ChildProcess.cp.emit (C:\Users\Tricky\Desktop\Work\ESC\ESC_temp\node_modules\child-process-promise\node_modules\cross-spawn\lib\enoent.js:40:29)
  
      at maybeClose (internal/child_process.js:962:16)
  
      at Socket.stream.socket.on (internal/child_process.js:381:11)
  
      at Socket.emit (events.js:182:13)
  
      at Pipe._handle.close (net.js:606:12)
  
    name: 'ChildProcessError',
  
    code: 1,
  
    childProcess:
  
     ChildProcess {
  
       _events: { error: [Function], close: [Function] },
  
       _eventsCount: 2,
  
       _maxListeners: undefined,
  
       _closesNeeded: 3,
  
       _closesGot: 3,
  
       connected: false,
  
       signalCode: null,
  
       exitCode: 1,
  
       killed: false,
  
       spawnfile: 'ffmpeg',
  
       _handle: null,
  
       spawnargs:
  
        [ 'ffmpeg',
  
          '-f',
  
          'lavfi',
  
          '-i',
  
          'anullsrc=r=16000:cl=mono',
  
          '-f',
  
          'dshow',
  
          '-ac',
  
          '2',
  
          '-i',
  
          'video=\'HP Truevision HD\'',
  
          '-s',
  
          '1280x720',
  
          '-r',
  
          '10',
  
          '-vcodec',
  
          'libx264',
  
          '-pix_fmt',
  
          'yuv420p',
  
          '-preset',
  
          'ultrafast',
  
          '-r',
  
          '25',
  
          '-g',
  
          '20',
  
          '-b:v',
  
          '2500k',
  
          '-codec:a',
  
          'libmp3lame',
  
          '-ar',
  
          '44100',
  
          '-threads',
  
          '6',
  
          '-b:a',
  
          '11025',
  
          '-bufsize',
  
          '512k',
  
          '-f',
  
          'flv',
  
          'rtmp://a.rtmp.youtube.com/live2/8dfu-69k0-dxyw-896q' ],
  
       pid: 18928,
  
       stdin:
  
        Socket {
  
          connecting: false,
  
          _hadError: false,
  
          _handle: null,
  
          _parent: null,
  
          _host: null,
  
          _readableState: [ReadableState],
  
          readable: false,
  
          _events: [Object],
  
          _eventsCount: 1,
  
          _maxListeners: undefined,
  
          _writableState: [WritableState],
  
          writable: false,
  
          allowHalfOpen: false,
  
          _sockname: null,
  
          _pendingData: null,
  
          _pendingEncoding: '',
  
          server: null,
  
          _server: null,
  
          [Symbol(asyncId)]: 132,
  
          [Symbol(lastWriteQueueSize)]: 0,
  
          [Symbol(timeout)]: null,
  
          [Symbol(kBytesRead)]: 0,
  
          [Symbol(kBytesWritten)]: 0 },
  
       stdout:
  
        Socket {
  
          connecting: false,
  
          _hadError: false,
  
          _handle: null,
  
          _parent: null,
  
          _host: null,
  
          _readableState: [ReadableState],
  
          readable: false,
  
          _events: [Object],
  
          _eventsCount: 2,
  
          _maxListeners: undefined,
  
          _writableState: [WritableState],
  
          writable: false,
  
          allowHalfOpen: false,
  
          _sockname: null,
  
          _pendingData: null,
  
          _pendingEncoding: '',
  
          server: null,
  
          _server: null,
  
          write: [Function: writeAfterFIN],
  
          [Symbol(asyncId)]: 133,
  
          [Symbol(lastWriteQueueSize)]: 0,
  
          [Symbol(timeout)]: null,
  
          [Symbol(kBytesRead)]: 0,
  
          [Symbol(kBytesWritten)]: 0 },
  
       stderr:
  
        Socket {
  
          connecting: false,
  
          _hadError: false,
  
          _handle: null,
  
          _parent: null,
  
          _host: null,
  
          _readableState: [ReadableState],
  
          readable: false,
  
          _events: [Object],
  
          _eventsCount: 2,
  
          _maxListeners: undefined,
  
          _writableState: [WritableState],
  
          writable: false,
  
          allowHalfOpen: false,
  
          _sockname: null,
  
          _pendingData: null,
  
          _pendingEncoding: '',
  
          server: null,
  
          _server: null,
  
          write: [Function: writeAfterFIN],
  
          [Symbol(asyncId)]: 134,
  
          [Symbol(lastWriteQueueSize)]: 0,
  
          [Symbol(timeout)]: null,
  
          [Symbol(kBytesRead)]: 1615,
  
          [Symbol(kBytesWritten)]: 0 },
  
       stdio: [ [Socket], [Socket], [Socket] ],
  
       emit: [Function] },
  
    stdout: undefined,
  
    stderr: undefined }
  
  </anonymous>

• How add Data Stream into MXF(using mpeg2video) file with FFmpeg and C/C++

  26 mars 2019, par Helmuth Schmitz

  I’m a little bit stuck here trying create a MXF file
  with data stream on it. I have several MXF video files that contain
  this standard

  **1 Video Stream:
  
       Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 50000 kb/s, 29.9
  
  16 audio streams
  
       Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
  
  1 Data Stream:
  
       Data: none**

  This data stream, contain personal data inside video file. I can
  open this stream and data is really there. Is all ok. But, when i try
  to create a file exactly like this, everytime i call "avformat_write_header"
  it returns an error.

  If i do comment the creation of this data streams the video file is succeffully
  created.

  If i change to "mpegts" with this data stream, the video file is also succeffully
  created.

  But, i can’t use mpets and i need this data stream.

  I know that is possible MXF with data stream cause i have this originals files
  that have this combination.

  So, i know that i missing something in my code.

  This is the way i create this Data Stream :

   void CFFmpegVideoWriter::addDataStream(EOutputStream *ost, AVFormatContext *oc, AVCodec **codec, enum AVCodecID codec_id)
  
      {
  
          AVCodecParameters *par;
  
  
  
          ost->stream = avformat_new_stream(oc, NULL);
  
          if (ost->stream == NULL)
  
          {
  
              fprintf(stderr, "OOooohhh man: avformat_new_stream() failed.\n");
  
              return;
  
          }
  
  
  
          par = ost->stream->codecpar;
  
          ost->stream->index = 17;
  
          par->codec_id = AV_CODEC_ID_NONE;
  
          par->codec_type = AVMEDIA_TYPE_DATA;
  
  
  
          ost->stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
      }

  the file openning is this :

  CFFMpegVideoWriter::CFFMpegVideoWriter(QString outputfilename) : QThread()
  
  {
  
      av_register_all();
  
      avcodec_register_all();
  
  
  
      isOpen = false;
  
      shouldClose = false;
  
  
  
      frameIndex = 0;
  
  
  
  #ifdef __linux__
  
      QByteArray bFilename = outputfilename.toUtf8();
  
  #else
  
      QByteArray bFilename = outputfilename.toLatin1();
  
  #endif
  
  
  
      const char* filename = bFilename.data();
  
  
  
      codecContext = NULL;
  
  
  
      //encontra o formato desejado...
  
      outputFormat = av_guess_format("mp2v", filename, nullptr);
  
      if (!outputFormat)
  
      {
  
          qDebug("Could not find suitable output format\n");
  
          return;
  
      }
  
  
  
      //encontra o codec...
  
      codec = avcodec_find_encoder(outputFormat->video_codec);
  
      if (!codec)
  
      {
  
          qDebug( "Codec not found\n");
  
          return;
  
      }
  
  
  
      //aloca o contexto do codec...
  
      codecContext = avcodec_alloc_context3(codec);
  
      codecContext->field_order = AV_FIELD_TT;
  
      codecContext->profile = FF_PROFILE_MPEG2_422;
  
  
  
      //aloca o contexto do formato...
  
      formatContext = avformat_alloc_context();
  
      formatContext->oformat = outputFormat;
  
  
  
      //aloca o contexto da midia de saida...
  
      avformat_alloc_output_context2(&formatContext, NULL, NULL, filename);
  
      if (!formatContext)
  
      {
  
          qDebug("Erro");
  
          return;
  
      }
  
  
  
      videoStream.tmp_frame = NULL;
  
      videoStream.swr_ctx = NULL;
  
  
  
      //adiciona a stream de video...
  
      if (outputFormat->video_codec != AV_CODEC_ID_NONE)
  
      {
  
          addVideoStream(&videoStream, formatContext, &video_codec, outputFormat->video_codec);       
  
      }
  
  
  
      //adiciona as 16 streams de audio...
  
      if (outputFormat->audio_codec != AV_CODEC_ID_NONE)
  
      {
  
          for (int i = 0; i < 16; i++)
  
          {
  
              addAudioStream(&audioStream[i], formatContext, &audio_codec, outputFormat->audio_codec);
  
          }       
  
      }
  
  
  
      addDataStream(&datastream, formatContext, &video_codec, outputFormat->video_codec);     
  
  
  
      videoStream.sws_ctx = NULL;
  
      for (int i = 0; i < 16; i++)
  
      {
  
          audioStream[i].sws_ctx = NULL;
  
      }   
  
      opt = NULL;
  
  
  
  
  
      //carreca o codec de video para stream de video...      
  
      initVideoCodec(formatContext, video_codec, &videoStream, opt);
  
  
  
  
  
      //carrega o codec de audio para stream de audio...s
  
      for (int i = 0; i < 16; i++)
  
      {
  
          initAudioCodec(formatContext, audio_codec, &audioStream[i], opt);
  
      }
  
  
  
  
  
      av_dump_format(formatContext, 0, filename, 1);
  
  
  
      //abrea o arquivo de saida..
  
      if (!(outputFormat->flags & AVFMT_NOFILE))
  
      {
  
          ret = avio_open(&formatContext->pb, filename, AVIO_FLAG_WRITE);
  
          if (ret < 0)
  
          {
  
              qDebug("Could not open'%s", filename);
  
              return;
  
          }
  
      }
  
  
  
      //escreve o cabecalho do arquivo...
  
      ret = avformat_write_header(formatContext, &opt);
  
      if (ret < 0)
  
      {
  
          qDebug("Error occurred when opening output file");
  
          return;
  
      }
  
  
  
      isOpen = true;
  
  
  
      QThread::start();
  
  }

  The code always fails at "avformat_write_header" call.

  But if i remove "datastream" or change it to mpegts everything runs fine.

  Any ideia of what am i doing wrong here ?

  Thanks for reading this.

  Helmuth

• Advice on how to specify length of animated GPX video with ffmpeg/image2pipe

  21 mai 2019, par Chris Olin

  I’m working on a personal project involving an action camera that records GPS data alongside video from an image sensor. I found an open source projected on GitHub called ’trackanimation’ that uses a colored marker to trace the GPX path on a OpenStreetMaps overlay, but it appears that the project has been abandoned. I’m trying to sync the trackanimation video to the image sensor video, but when I try using video editing software to slow the GPX video down to 1%, it still ends up being shorter than the image sensor video. I’ve tried messing with the baked in ffmpeg command in make_video(), but still can’t get the output video to be as long as I want it to be.

  I started digging into the library source to see how the video was being created, tried tweaking a couple things to no avail.

  import trackanimation
  
  from trackanimation.animation import AnimationTrack
  
  
  
  gpx_file = "Videos/20190516 unity ride #2.mp4.gpx"
  
  gpx_track = trackanimation.read_track(gpx_file)
  
  
  
  fig = AnimationTrack(df_points=gpx_track, dpi=300, bg_map=True, map_transparency=0.7)
  
  fig.make_video(output_file="Videos/1-11trackanimationtest.mp4", framerate=30, linewidth=1.0)

      def make_video(self, linewidth=0.5, output_file='video', framerate=5):
  
          cmdstring = ('ffmpeg',
  
                       '-y',
  
                       '-loglevel', 'quiet',
  
                       '-framerate', str(framerate),
  
                       '-f', 'image2pipe',
  
                       '-i', 'pipe:',
  
                       '-r', '25',
  
                       '-s', '1920x1080',
  
                       '-pix_fmt', 'yuv420p',
  
                       output_file + '.mp4'
  
                       )

  I expect that I should be able to linearly "slow" the GPX video to a dynamic value based on the length of the video and the length I want it to be.