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• ffmpeg mp3 encoding result differs between pipe and file creation

  11 octobre 2018, par Jinsung Lee

  I’m making the program by using ffmpeg but stuck in some problem

  Encode to mp3 and file out

  ffmpeg -nostats -loglevel 0 -i example.weba -i albumart.jpg -map 0:0 -map 1:0 -id3v2_version 3 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" out.mp3

  this works very good but

  Encode to mp3 and pipe out

  ffmpeg -nostats -loglevel 0 -i example.weba -i albumart.jpg -map 0:0 -map 1:0 -id3v2_version 3 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -f MP3 - > out.mp3

  using pipe output i got

  ffmpeg -i out.mp3
  
  [mp3 @ 0000000001028980] Header missing

  This error

  I need to get this mp3 data with oneline php shell_exec command

  any solution ?

  Thanks

• Using a pipe character | with child_process spawn

  19 avril 2020, par Titan

  I'm running nodejs on a raspberry pi and I want to run a child process to spawn a webcam stream.

  



  Outside of node my command is :

  



  raspivid -n -mm matrix -w 320 -h 240 -fps 18 -g 100 -t 0 -b 5000000 -o - | ffmpeg -y -f h264 -i - -c:v copy -map 0:0 -f flv -rtmp_buffer 100 -rtmp_live live "rtmp://example.com/big/test"


  



  With child_process I have to break each argument up

  



  var args = ["-n", "-mm", "matrix", "-w", "320", "-h", "240", "-fps", "18", "-g", "100", "-t", "0", "-b", "5000000", "-o", "-", "|", "ffmpeg", "-y", "-f", "h264", "-i", "-", "-c:v", "copy", "-map", "0:0", "-f", "flv", "-rtmp_buffer", "100", "-rtmp_live", "live", "rtmp://example.com/big/test"];


  



  camera.proc = child.spawn('raspivid', args);


  



  However it chokes on the | character :

  



  error, exit code 64
Invalid command line option (|)


  



  How do I use this pipe character as an argument ?

  


• FFMPEG stream .mpg to windows pipe and display video in C#

  25 septembre 2018, par Przemysław

  i’ve got problem with streaming mpg video to windows pipe. I wang decode video with command ffmpeg.exe to windows pipe and connect to that pipe with c# and display video on winform. I’ve tried many commands but none of them worked.

  FFmpeg command :

  ffmpeg -i Day Flight.mpg -f image2pipe pipe:1 > //./pipe/ffpipe

  C# code :

  using System;
  
  using System.Drawing;
  
  using System.Windows.Forms;
  
  using System.IO;
  
  using System.IO.Pipes;
  
  using System.Threading;
  
  using System.Runtime.InteropServices;
  
  using System.Text;
  
  
  
  namespace WindowsFormsApplication1
  
  {
  
  
  
  public partial class Form1 : Form
  
  {
  
  
  
      String readLine_;
  
      private void readThread()
  
      {
  
  
  
          while (true)
  
          {
  
              readLine_ = reader_.ReadLine();
  
              if (readLine_ != null)
  
              {
  
  
  
                  byte[] bytes = Encoding.Unicode.GetBytes(readLine_);
  
                  //Console.WriteLine(readLine_);
  
                  //Console.ReadLine();
  
                  var ms = new MemoryStream(bytes);
  
                  // Bitmap bm = new Bitmap(ms);
  
                  Image im = (Bitmap)((new ImageConverter()).ConvertFrom(bytes));
  
              }
  
              else
  
                  Console.WriteLine("empty string");
  
  
  
              //
  
  
  
  
  
  
  
          }
  
      }
  
      private NamedPipeServerStream server_;
  
      StreamReader reader_;
  
  
  
  
  
      public Form1()
  
      {
  
          InitializeComponent();
  
      }
  
  
  
      private void Form1_Load(object sender, EventArgs e)
  
      {
  
          AllocConsole();
  
          server_ = new NamedPipeServerStream("ffpipe", PipeDirection.In, 1, PipeTransmissionMode.Byte);
  
          server_.WaitForConnection();
  
          reader_ = new StreamReader(server_);
  
          Thread t = new Thread(readThread);
  
          t.Start();
  
  
  
  
  
      }
  
  
  
  
  
      [DllImport("kernel32.dll", SetLastError = true)]
  
      [return: MarshalAs(UnmanagedType.Bool)]
  
      static extern bool AllocConsole();
  
  }

  }

  I can’t get image in C#, my program crashes in line
  Image im = (Bitmap)((new ImageConverter()).ConvertFrom(bytes)) ;

  And I don’t know where I make a mistake - in ffmpeg piping or in C# program
  https://image.ibb.co/eGDymp/Przechwytywanie.png
  https://image.ibb.co/hWpM6p/Przechwytywanie.png

  Example video :
  http://samples.ffmpeg.org/MPEG2/mpegts-klv/Day%20Flight.mpg