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• child process spawn output file and directory in NodeJs

  5 juin 2021, par Zeeshan

  I am using ffmpeg with child process to merge audio and video, but when i am trying to download the file, it is downloading in the same folder, but i want it to download it in the public folder.

  


  following is my code for the child process spawn.

  


  // Start the ffmpeg child process
const ffmpegProcess = cp.spawn(ffmpeg, [
    // Remove ffmpeg's console spamming
    '-loglevel', '8', '-hide_banner',
    // Redirect/Enable progress messages
    '-progress', 'pipe:3',
    // Set inputs
    '-i', 'pipe:4',
    '-i', 'pipe:5',
    // Map audio & video from streams
    '-map', '0:a',
    '-map', '1:v',
    // Keep encoding
    '-c:v', 'copy',
    // Define output file
    'title.mp4',
], {
    windowsHide: true,
    stdio: [
        /* Standard: stdin, stdout, stderr */
        'inherit', 'inherit', 'inherit',
        /* Custom: pipe:3, pipe:4, pipe:5 */
        'pipe', 'pipe', 'pipe',
    ],
});


  


• Kill child process only after readFile() Node js Electron

  14 mai 2021, par Radespy

  I'm using an imported ffmpeg binary ffmpeg-static-electronin an Electron-React app (on Windows Pro 10) and want to delete a saved cropped video and then kill the child process afterwards from my Main process.

  


  The overall aim is to crop a video of the whole screen following capture and then send the cropped video to a renderer.

  


  const fsPromises = require('fs').promises
const ffmpeg = require('ffmpeg-static-electron')
const { execFile } = require("child_process")


ipcMain.on("windoze_capture_screen:video_buffer", async (event, buffer) => {
    const temp_directory =  await fsPromises.mkdtemp(await fsPromises.realpath(os.tmpdir()) + path.sep)
    const capture_screen_video_path = path.join(temp_directory, "screen_capture_video.mp4")

    child_object = execFile(`${ffmpeg.path}`, 

            ['-i', `${capture_screen_video_path}`, '-vf', `crop=${width}:${height}:${x_pos}:${y_pos}`, `${path.join(temp_directory,'cropped_video.mp4')}`])
            
    child_object.on("exit", async () => {

        // child_object.kill()
        console.log("?Killed -1", child_object.killed)
        
        try { 
            databasePayload.video_buffer = await fsPromises.readFile(path.join(temp_directory, "cropped_video.mp4"), {encoding: 'base64'})
            mainWindow.webContents.send("main_process:video_buffer", databasePayload.video_buffer)
        } catch (error) {
            console.log(error)
        } finally {

            // child_object.kill()
            console.log("?Killed - 2", child_object.killed)
            
            // noASAR required to be set to 'true' in order to remove temp directory in build
            process.noAsar = true 
            fs.rmdir(temp_directory, {recursive: true}, (error) => {if (error) {log(error)}})
            process.noASAR = false
            }

            // 3rd scenario
            // child_object.kill()
            console.log("?Killed -3", child_object.killed)   
        })

        // 4th scenario
        console.log("?Killed-4", child_object.killed)   
    })



  


  When running each of these scenarios, I get the following outputs.

  


  Scenario's 1, 2 and 3 - Successfully sends cropped video to renderer but doesn't kill process.

  


  Output :

  


  ?Killed-4 false
?Killed -1 false
[ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.3.0 (GCC).... etc. ]
?Killed-2 false
?Killed -3 false


  


  Scenario 4 - Doesn't crop video

  


  ?Killed-4 true
?Killed -1 true
Command failed: C:\Users\XXX\Desktop\windows-electron-forge\node_modules\ffmpeg-static-electron\bin\win\x64\ffmpeg.exe -i C:\Users\XXX\AppData\Local\Temp\4WgnUw\screen_capture_video.mp4 -vf crop=796:763:462:509 C:\Users\XXX\AppData\Local\Temp\4WgnUw\cropped_video.mp4

[Error: ENOENT: no such file or directory, open 'C:\Users\XXX\AppData\Local\Temp\4WgnUw\cropped_video.mp4'] {
errno: -4058,
code: 'ENOENT',
syscall: 'open',
path: 'C:\\Users\\XXX\\AppData\\Local\\Temp\\4WgnUw\\cropped_video.mp4'
}
?Killed - 2 true
?Killed -3 true


  


  The last scenario has been tried out of desperation.

  


  Question : Where am I going wrong with this ? I suspect it's something to do with ipc between child and parent process but not sure where to place the code.

  


  Any help will be much appreciated !!!

  


• Use both stdio and stout in the same child process

  31 janvier 2021, par mr noob

  I am using ffmpeg to combine the audio/video 2 streams and pipe them to express. Here is my code :

  


  var ffmpeg = cp.spawn('ffmpeg', [
        // Set inputs
        '-i', 'pipe:4',
        '-i', 'pipe:5',
        // Map audio & video from streams
        '-map', '0:v',
        '-map', '1:a',
        // Keep encoding
        '-c', 'copy',
        '-movflags', 'frag_keyframe+empty_moov',
        '-f', 'mp4',
        // Define output file
        'pipe:1',
      ], {
        stdio: [
          /* Standard: stdin, stdout, stderr */
          'inherit', 'inherit', 'inherit',
          /* Custom: pipe:3, pipe:4, pipe:5 */
          'pipe', 'pipe', 'pipe',
        ],
      });
      video.pipe(ffmpeg.stdio[4]);
      audio.pipe(ffmpeg.stdio[5]);
      res.header('Content-Disposition', 'attachment; filename="video.mp4"');
      ffmpeg.stdout.pipe(res);


  


  But the code gives an error saying that ffmpeg.stout is null. After a bit of research, I found out that you can't have the stdio options array, or else stout will be null. Any way to fix this ?