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• configure : add —enable-libvpl option

  3 février 2021, par Haihao Xiang

  configure : add —enable-libvpl option
  This allows user to build FFmpeg against Intel oneVPL. oneVPL 2.6
  
  is the required minimum version when building Intel oneVPL code.
  It will fail to run configure script if both libmfx and libvpl are
  
  enabled.
  It is recommended to use oneVPL for new work, even for currently available
  
  hardwares [1]
  Note the preferred child device type is d3d11va for libvpl on Windows.
  
  The commands below will use d3d11va if d3d11va is available on Windows.
  
  $ ffmpeg -hwaccel qsv -c:v h264_qsv ...
  
  $ ffmpeg -qsv_device 0 -hwaccel qsv -c:v h264_qsv ...
  
  $ ffmpeg -init_hw_device qsv=qsv:hw_any -hwaccel qsv -c:v h264_qsv ...
  
  $ ffmpeg -init_hw_device qsv=qsv:hw_any,child_device=0 -hwaccel qsv -c:v h264_qsv ...
  User may use child_device_type option to specify child device type to
  
  dxva2 or derive a qsv device from a dxva2 device
  
  $ ffmpeg -init_hw_device qsv=qsv:hw_any,child_device=0,child_device_type=dxva2 -hwaccel qsv -c:v h264_qsv ...
  
  $ ffmpeg -init_hw_device dxva2=d3d9:0 -init_hw_device qsv=qsv@d3d9 -hwaccel qsv -c:v h264_qsv ...
  [1] https://www.intel.com/content/www/us/en/develop/documentation/upgrading-from-msdk-to-onevpl/top.html
  

  • [DH] configure

• 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.