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• Cannot merge audio and video streams from ytdl-core

  20 août 2022, par Abhigyan Kumar

  I am trying to merge ytdl-core video only and audio only streams and sending the merged stream are response to user (for download in browser). With JavaScript only, its working perfectly fine. But typeScript is saying child process stdio is undefined

  


  import express, { Request } from "express";
import ytdl from "ytdl-core";
import cp from "child_process";
import ffmpeg from "ffmpeg-static";    
app.get("/downloadmerged", (req, res) => {
res.setHeader("Content-Type", "video/mp4");
res.setHeader(
  `Content-Disposition`,
  `attachment; filename="Merged.mp4"`
);
  const ref = "https://www.youtube.com/watch?v=aR-KAldshAE";
  const audio = ytdl(ref, { filter: "audioonly", quality: "highestaudio" });
  const video = ytdl(ref, { filter: "videoonly", quality: "highestvideo" });
  const ffmpegProcess = cp.spawn(
    ffmpeg,
    [
      // Remove ffmpeg's console spamming
      "-loglevel",
      "0",
      "-hide_banner",
      // 3 second audio offset
      "-itsoffset",
      "3.0",
      "-i",
      "pipe:3",
      "-i",
      "pipe:4",
      // Rescale the video
      "-vf",
      "scale=320:240",
      // Choose some fancy codes
      "-c:v",
      "libx265",
      "-x265-params",
      "log-level=0",
      "-c:a",
      "flac",
      // Define output container
      "-f",
      "matroska",
      "pipe:5",
    ],
    {
      windowsHide: true,
      stdio: [
        /* Standard: stdin, stdout, stderr */
        "inherit",
        "inherit",
        "inherit",
        /* Custom: pipe:3, pipe:4, pipe:5 */
        "pipe",
        "pipe",
        "pipe",
      ],
    }
  );
  ffmpegProcess.on("close", () => {
    process.stdout.write("\n\n\n");
    console.log("done");
  });
 
  audio.pipe(ffmpegProcess.stdio[3]);
  video.pipe(ffmpegProcess.stdio[4]);
  ffmpegProcess.stdio[5].pipe(res);
});


  


  line ffmpegProcess.stdio[3] and ffmpegProcess.stdio[4] are giving type error

  


  Argument of type 'Readable | Writable | null | undefined' is not assignable to parameter of type 'WritableStream'.Type 'undefined' is not assignable to type 'WritableStream'

  


  


• How to store output of ffmpeg in a variable using NodeJS / execFile and ffmpeg ?

  22 août 2022, par Radespy

  I'm running an Electron app which uses the 'ffmpeg-static-electron' package to process a local video file.

  


  I am trying to store the output as a buffer in a variable for subsequent processing.

  


  Using IPC, I can successfully execute the following in the main.js file (running Node), which produces a cropped video file.

  


  const { execFile } = require("child-process")
const ffmpeg = require("ffmpeg-static-electron")

ipcMain.on("crop_video", () => {

execFile(
    `${ffmpeg.path}`,
    [
      "-i",
      `${testVideoCropPath}`,
      "-filter:v",
      `crop=600:600:100:100`,
      "-preset",
      "fast",
      "-progress",
      "pipe:1",
      `${path.join(desktopDirPath, "cropped-video.mp4")}`,
    ],
    (error, stdout, stderr) => {
      if (error) {
        console.error("stderr", stderr);
        throw error;
      }
      console.log("Success", stdout);
    }
  );
})


  


  Here's the output :

  


  Success frame=238
[1] fps=0.0
...
[1] dup_frames=0
[1] drop_frames=0
[1] speed=8.23x
[1] progress=end


  


  What I wish to do is to store the cropped-video as a buffer in a variable.

  


  To experiment, I tried :

  


  ipcMain.on("crop_video", () => {

const test = execFile(
    `${ffmpeg.path}`,
    [
      "-i",
      `${testVideoCropPath}`,
      "-filter:v",
      `crop=600:600:100:100`,
      "-preset",
      "fast",
      `${path.join(desktopDirPath, "cropped-video.mp4")}`,
       "pipe:1",
    ],
    (error, stdout, stderr) => {
      if (error) {
        console.error("stderr", stderr);
        throw error;
      }
      console.log("Success", stdout);
    }
  );

   test.on('data', (data) => {console.log(typeof data)}
})


  


  Which doesn't print anything to the console.

  


  How can I access sdout in buffer format ?

  


  Is there a way to store the output with something like :

  


  test.on('data', (data)=> {
let var = Buffer.from(data)})


  


  Thanks.

  


• MediaStream WebM to HLS server

  2 septembre 2022, par DNS

  I'm trying to create my custom stream server like Twitch.

  


  For this, I'm using mediastream from mediaapi to get the camera buffer and send it to my HLS server with WebSockets and MediaRecorder.

  


  this.mediaRecorder = new MediaRecorder(this.stream, {
    mimeType: 'video/webm',
});
this.mediaRecorder.ondataavailable = async (event) => {
    const ab = await event.data.arrayBuffer();
    const message = {
        title: 'dataUserCameraAudioVideo',
        data: Array.from(new Uint8Array(ab))
    };
    this.mediaSocket.send(JSON.stringify(message));
};
this.mediaRecorder.start(1000);


  


  So now I send the buffer (which is working very well), I try to transcode it into hls file with ffmpeg. For this I use child process of nodejs.

  


  const ffmpeg = ChildProcess.spawn('ffmpeg', ffmpegArgs());

ffmpeg.on('close', (code, signal) => {
    console.log('FFmpeg child process closed, code ' + code + ', signal ' + signal);
}); 

function ffmpegArgs(iceUrl) {
    const args = [
        '-i','-',
        '-f', 'hls',
        '-hls_time', '4',
        'output.m3u8'
    ];
    return args;
}


  


  I don't understand why my child process is closing :

  


  output from ffmpeg :

dataUserCameraAudioVideo
dataUserCameraAudioVideo
dataUserCameraAudioVideo
dataUserCameraAudioVideo
dataUserCameraAudioVideo
dataUserCameraAudioVideo
FFmpeg child process closed, code 1, signal null


  


  Of course I don't have any output.m3u8 created. Are my ffmpeg args wrong ?