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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'

  


  


• Feed raw data to ffmpeg from python

  27 octobre 2020, par eri

  I want to wrap h264 stream to mp4 container on fly. But ffmpeg exits after first buffer

  


  ffmpeg = subprocess.Popen("ffmpeg -f h264 -i pipe: -c copy -f mp4 -movflags frag_keyframe+empty_moov+faststart pipe:".split(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)

fd = ffmpeg.stdout.fileno()
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)

while True:
    data = infile.read(32768)
    ffmpeg.stdin.write(data)
    data = ffmpeg.stdout.read()
    outfile.write(data)


  


• Piping PCM data from FFMPEG to another process with Python subprocess

  13 février 2017, par Pete Bleackley

  I am trying to transcribe a podcast. To do so, I am decoding the mp3 stream with FFMPEG, and piping the resulting PCM output to the speech recognition component. My code looks like this.

  mp3=subprocess.Popen(['ffmpeg','-i',audio_url,
  
                                '-f','s16le','-ac','1','-ar','16000','pipe:0'],
  
                                stdout=subprocess.PIPE)
  
  sphinx=subprocess.Popen(['java','-jar','transcriber.jar'],
  
                                  stdin=mp3.stdout,
  
                                  stdout=subprocess.PIPE)

  Where audio_url is the url of the mp3 file.

  When I try to run this, it hangs. It appears that feeding the decoded PCM data through the pipe has deadlocked. What can I do to fix this ? The size of the output data is likely to be too big for subprocess.Popen.communicate to be an option, and explicitly calling mp3.stdout.close() has had no effect.