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• Piping output of youtube-dl to a script using ffmpeg looks ok using echo but returns an error when executing

  29 May 2020, by I0_ol

  I am trying to use youtube-dl to get the urls of some videos and then pipe the resulting urls into the input of my script. So in my terminal I do

  



  youtube-dl --ignore-config -iga ~/Desktop/youtube/videolist.txt | myscript.sh


  



  In my script I define things as

  



  command='ffmpeg'        
inputArgs='-i'              
outputArgs='-c:v libx264 -preset ultrafast -qp 0'       
directory="${HOME}/Desktop/Videos/"
output="video${count}"      
extension='mp4'         


  



  I test it with echo to make sure everything appears in the correct order.

  



  echo "${command}" "${inputArgs}" "${input}" "${outputArgs}" \
"${directory}""${output}${count}"."${extension}"


  



  And the output from that looks correct. But when I try to run the same thing without the preceding echo command, i.e.,

  



  "${command}" "${inputArgs}" "${input}" "${outputArgs}" \
"${directory}""${output}${count}"."${extension}"


  



  I get an error message that says

  



  


  At least one output file must be specified.

  


  



  So it seems pretty obvious to me that I'm doing something wrong when attempting to execute it.

  



  I have tried:

  



  

  • quoting the entire line as a whole

  


  • quoting different sections together

  


  • using the exec command in front of everything

  


  



  No matter what I do, an error occurs at some point in the process. I know it's something simple I'm doing wrong. Would someone please enlighten me as to what that might be?

  



  I feel very strongly that the . shouldn't just be in the middle of everything like that, but I really don't know.

  



  Again, everything looks as it should when I run echo before the string of shell parameters.

  



  If more of the script I'm using is needed to understand what I'm talking about, that is not a problem.

  


• Download youtube video as stream Readable object

  26 December 2023, by Abraam Emad

  in this function it download youtube video as a file out.mp4 on hard disk i need to download it as a Readable Object to upload it

  


  private async downloadVideo(videoId: string) {
// Buildin with nodejs
const cp = require('child_process');
const readline = require('readline');
// External modules
const ytdl = require('ytdl-core');
const ffmpeg = require('ffmpeg-static');
// Global constants
const ref = `https://www.youtube.com/watch?v=${videoId}`;
const tracker = {
  start: Date.now(),
  audio: { downloaded: 0, total: Infinity },
  video: { downloaded: 0, total: Infinity },
  merged: { frame: 0, speed: '0x', fps: 0 },
};

// Get audio and video streams
const audio = ytdl(ref, { quality: 'highestaudio' })
  .on('progress', (_, downloaded, total) => {
    tracker.audio = { downloaded, total };
  });
const video = ytdl(ref, { quality: 'highestvideo' })
  .on('progress', (_, downloaded, total) => {
    tracker.video = { downloaded, total };
  });

// Prepare the progress bar
let progressbarHandle = null;
const progressbarInterval = 1000;
const showProgress = () => {
  readline.cursorTo(process.stdout, 0);
  const toMB = i => (i / 1024 / 1024).toFixed(2);

  process.stdout.write(`Audio  | ${(tracker.audio.downloaded / tracker.audio.total * 100).toFixed(2)}% processed `);
  process.stdout.write(`(${toMB(tracker.audio.downloaded)}MB of ${toMB(tracker.audio.total)}MB).${' '.repeat(10)}\n`);

  process.stdout.write(`Video  | ${(tracker.video.downloaded / tracker.video.total * 100).toFixed(2)}% processed `);
  process.stdout.write(`(${toMB(tracker.video.downloaded)}MB of ${toMB(tracker.video.total)}MB).${' '.repeat(10)}\n`);

  process.stdout.write(`Merged | processing frame ${tracker.merged.frame} `);
  process.stdout.write(`(at ${tracker.merged.fps} fps => ${tracker.merged.speed}).${' '.repeat(10)}\n`);

  process.stdout.write(`running for: ${((Date.now() - tracker.start) / 1000 / 60).toFixed(2)} Minutes.`);
  readline.moveCursor(process.stdout, 0, -3);
};

// 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
  '-f', 'mpegts', // Use MPEG-TS format for streaming
  'out.mp4'
], {
  windowsHide: true,
  stdio: [
    /* Standard: stdin, stdout, stderr */
    'inherit', 'inherit', 'inherit',
    /* Custom: pipe:3, pipe:4, pipe:5 */
    'pipe', 'pipe', 'pipe',
  ],
});
ffmpegProcess.on('close', () => {
  console.log('done');
  // Cleanup
  process.stdout.write('\n\n\n\n');
  clearInterval(progressbarHandle);
});
// Link streams
// FFmpeg creates the transformer streams and we just have to insert / read data
ffmpegProcess.stdio[3].on('data', chunk => {
  // Start the progress bar
  if (!progressbarHandle) progressbarHandle = setInterval(showProgress, progressbarInterval);
  // Parse the param=value list returned by ffmpeg
  const lines = chunk.toString().trim().split('\n');
  const args: any = {};
  for (const l of lines) {
    const [key, value] = l.split('=');
    args[key.trim()] = value.trim();
  }
  tracker.merged = args;
});
audio.pipe(ffmpegProcess.stdio[4]);
video.pipe(ffmpegProcess.stdio[5]);


  


  }`

  


• Video created in FFMPEG on YouTube doesn't work

  10 March 2023, by Mark

  There is a problem when working with FFMPEG and then uploading to YouTube.

  


  I have a video that is 4:15 long (255 seconds). When I create such a video in Adobe Premiere and upload it to YouTube, everything is fine. The problem occurs when I create such a video in FFMPEG. Before the HD versions are processed (>= 1080p) the video works fine, but when the HD versions appear, its duration on the scrollbar becomes 4:00 (240 seconds). If you go to the end of the video at 4:00, it continues to play for another 15 seconds.

  


  Here is an example of such a video clip: https://youtu.be/G_tMctEklM4

  


  Screenshot: https://i.stack.imgur.com/HxWs5.png

  


  I would be grateful for your help.

  


  UPD

  


  I think I figured out what the problem was.

  


  I took 5 video files of 25 seconds each and merged them. The resulting file is 125 seconds long, I uploaded it to YouTube - everything is fine. Then I tried to build my project - again, problems. Apparently, the problem is that I merged 42 files: 2 files for 20 seconds and 40 files for 5-6 seconds. These are not integers, here are some of the files:

  


  06.143000, 05.983000, 06.488000, 06.018000, 05.809000

  


  So, I understand FFMPEG rounds them down to integer number, and due to the fact that there are a lot of such files - 42, so there is a shift of 15-20 seconds (about 0.5 seconds from each file). But what to do with it I still do not understand.

  


  Related topic: https://www.reddit.com/r/ffmpeg/comments/e1o3hv/ffconcat_filter_with_millisecond_precision_how/f8qvztl/

  


  and this (???): ffmpeg - avoid duration approximation of generated files