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• Pass individual frames as BGRA byte array and set the timestamps via pipe to FFmpeg

  30 juillet 2023, par Nicke Manarin

  I have a set of images (as BGRA byte[]) with their respective timestamps in milliseconds and I want to pass it to FFmpeg to build an animation.

  


  I'm using FFmpeg v6 right now and in this example I'm expecting a GIF as output, but I'm going to export to multiple formats later.

  


  var arguments = "-vsync passthrough  
-f rawvideo 
-pix_fmt bgra 
-video_size {width}x{height} 
-i -  
-loop 0 
-lavfi palettegen=stats_mode=diff[pal],[0:v][pal]paletteuse=new=1:dither=sierra2_4a:diff_mode=rectangle 
-f gif 
-y \"C:\Users\User\Desktop\test.gif\"";

var process = new Process
{
    StartInfo = new ProcessStartInfo
    {
        FileName = "./ffmpeg.exe",
        Arguments = arguments.Replace("{width}", width.ToString()).Replace("{height}", height.ToString()),
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        UseShellExecute = false,
        CreateNoWindow = true
    }
};

_process.Start();



  


  Then on my render loop, I'm trying to send the frames and their timestamps one by one.

  


  public void EncodeFrame(IntPtr bufferAddress, int bufferStride, int width, int height, int index, long timestamp, int delay)
{
    var frameSize = height * bufferStride;
    var frameBytes = new byte[frameSize];
    System.Runtime.InteropServices.Marshal.Copy(bufferAddress, frameBytes, 0, frameSize);

    _process.StandardInput.BaseStream.Write(frameBytes, 0, frameSize);
    _process.StandardInput.BaseStream.Write(_delimiter, 0, _delimiter.Length);
    _process.StandardInput.BaseStream.Write(BitConverter.GetBytes(timestamp), 0, sizeof(long));
}


  


  The issue is that I'm getting an IOException (The pipe has been ended), so probably I'm not sending the frames correctly (not sending the delimiter and timestamp doesn't help).

  


  Is this even possible ?

  


• NodeJS SpeechRecorder pipe to child process ffmpeg encoder - dest.on is not a function

  10 décembre 2022, par Matthew Swaringen

  Trying to make a utility to help me with recording words for something. Unfortunately getting stuck on the basics.

  


  The error I get when I hit s key and talk enough to fill the buffer is

  


  terminate called after throwing an instance of 'Napi::Error'
  what():  dest.on is not a function
[1]    2298218 IOT instruction (core dumped)  node record.js


  


  Code is below. I can write the wav file and then encode that but I'd rather not have to have an intermediate file unless there is no way around it, and I can't imagine that is the case.

  


  const { spawn } = require('child_process');
const { writeFileSync } = require('fs');
const readline = require('readline');
const { SpeechRecorder } = require('speech-recorder');
const { WaveFile } = require('wavefile');

let paused = true;

const ffmpeg = spawn('ffmpeg', [
 // '-f', 's16', // input format
  //'-sample_rate', '16000',
  '-i', '-', // input source
  '-c:a', 'libvorbis', // audio codec  
  'output.ogg', // output file  
  '-y'
]);

let buffer = [];
const recorder = new SpeechRecorder({
  onAudio: ({ audio, speech }) => {
    //if(speech) {

      for (let i = 0; i < audio.length; i++) {
        buffer.push(audio[i]);
      }

      if(buffer.length >= 16000 * 5) { 
        console.log('piping to ffmpeg for output');
        let wav = new WaveFile()
        wav.fromScratch(1,16000,"16",buffer);
        //writeFileSync('output.wav',wav.toBuffer());
        ffmpeg.stdin.pipe(buffer, {end: false});
      }
    //}
  }
});

// listen for keypress events
readline.emitKeypressEvents(process.stdin);
process.stdin.setRawMode(true);

process.stdin.on('keypress', (str, key) => {
  if (key.name === 's') {
    // pause or resume recording
    paused = !paused;
    if(paused) { recorder.stop(); } else { recorder.start(); }

   
  } else if (key.ctrl && key.name === 'c') {
    // exit program
    ffmpeg.kill('SIGINT');    
    process.exit();
  }
});


  


• How to pipe a new command after ffmpeg background process completes ? (PHP)

  12 septembre 2013, par Mike Feng

  Ok this is my ffmpeg process :

  exec("/usr/local/bin/ffmpeg -y -i source.avi dest.mp4 >/dev/null 2>/dev/null &

  Now, I wish to execute a php file after the conversion is complete. Logically, this is what I have :

  exec("/usr/local/bin/ffmpeg -y -i source.avi dest.mp4 >/dev/null 2>/dev/null ; php proceed.php &

  This doesn't work though, since then PHP will hold up the process to wait till the ffmpeg conversion is complete. What I want is basically to call proceed.php after the conversion completes, both of which are done in the background.

  If anyone can provide the Windows server solution, that will be awesome too. Thank you in advanced !