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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>

• Node.js Error : spawn process ffmpeg ChildProcessError

  12 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>

• Render Multiple Gifs with ffplay/ffmpeg in Winform

  17 juin 2019, par Purqs

  I’m trying to get x number of animated gifs to render on like a Panel or PictureBox and using transparency that is in each gif. I’ve tried a couple approaches but am not super famiular with ffmpeg and such. Below is some code that I use to get it to render inside a panel, but I can’t figure out how to get like 5 gifs to stack/layer on one another and still render as you would expect.

  I need/want this to render in the form and not outputted. I am a little confused to why the ffplay.exe doesn’t use the -i command and that might be why i can’t get it to render. any ideas ?

  Working example below.

  using System;
  
  using System.Collections.Generic;
  
  using System.ComponentModel;
  
  using System.Data;
  
  using System.Drawing;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Windows.Forms;
  
  using System.Diagnostics;
  
  using System.Threading;
  
  using System.IO;
  
  using System.Reflection;
  
  using System.Runtime.InteropServices;
  
  using System.Drawing.Text;
  
  using System.Text.RegularExpressions;
  
  using System.Configuration;
  
  using Microsoft.Win32;
  
  using System.Windows.Forms.VisualStyles;
  
  
  
  //FOR THIS EXAMPLE CREATE FORM HAVE BUTTON ON IT AND PANEL.
  
  //button: button's click is "button1_Click"
  
  //panel: Needed to output the render on it.
  
  //FILES:
  
  //Test.Gif
  
  //These ff files came from the ffmpeg offical site.
  
  //ffplay.exe //currently using
  
  //ffmpeg.exe //thinking i need to use to get it how I want.
  
  //I most of the code below from https://stackoverflow.com/questions/31465630/ffplay-successfully-moved-inside-my-winform-how-to-set-it-borderless which was a good starting point.
  
  
  
  namespace Test_Form
  
  {
  
      public partial class Form1 : Form
  
      {
  
          [DllImport("user32.dll", SetLastError = true)]
  
          private static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
  
  
  
          [DllImport("user32.dll")]
  
          private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
  
  
  
  
  
          //Process ffplay = null;
  
  
  
          public Form1()
  
          {
  
              InitializeComponent();
  
              Application.EnableVisualStyles();
  
              this.DoubleBuffered = true;
  
          }
  
  
  
  
  
  
  
          public Process ffplay = new Process();
  
          private void FFplay()
  
          {
  
              ffplay.StartInfo.FileName = "ffplay.exe";
  
              ffplay.StartInfo.Arguments = "-noborder Test.gif"; //THIS IS WHERE I INPUT THE GIF FILE
  
              ffplay.StartInfo.CreateNoWindow = true;
  
              ffplay.StartInfo.RedirectStandardOutput = true;
  
              ffplay.StartInfo.UseShellExecute = false;
  
  
  
              ffplay.EnableRaisingEvents = true;
  
              ffplay.OutputDataReceived += (o, e) => Debug.WriteLine(e.Data ?? "NULL", "ffplay");
  
              ffplay.ErrorDataReceived += (o, e) => Debug.WriteLine(e.Data ?? "NULL", "ffplay");
  
              ffplay.Exited += (o, e) => Debug.WriteLine("Exited", "ffplay");
  
              ffplay.Start();
  
  
  
              Thread.Sleep(1000); // you need to wait/check the process started, then...
  
  
  
              // child, new parent
  
              // make 'this' the parent of ffmpeg (presuming you are in scope of a Form or Control)
  
              SetParent(ffplay.MainWindowHandle, this.Handle);
  
  
  
              // window, x, y, width, height, repaint
  
              // move the ffplayer window to the top-left corner and set the size to 320x280
  
              MoveWindow(ffplay.MainWindowHandle, 800, 600, 320, 280, true);
  
  
  
              SetParent(ffplay.MainWindowHandle, this.panel1.Handle);
  
              MoveWindow(ffplay.MainWindowHandle, -5, -30, 320, 280, true);
  
          }
  
  
  
  //runs the FFplay Command
  
  private void button1_Click(object sender, EventArgs e)
  
          {
  
              FFplay();
  
  
  
          }
  
  
  
          private void Form1_FormClosed(object sender, FormClosedEventArgs e)
  
          {
  
              try { ffplay.Kill(); }
  
              catch { }
  
          }
  
      }

  I would like the button to allow me to add any number of gifs (like 5 or 10) all to the same area and have them being animated with their transparent showing what is under that gif.

  So for example I could have a circle image, then a spinning/loading transparent gif on top, and then a gif that counts up/down on top of that one to give me the effect of a count-down.

  Thanks for all the help !