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• avformat/mxfenc : Write Audio Ref Level for D10

  6 avril 2018, par Michael Niedermayer

  avformat/mxfenc : Write Audio Ref Level for D10
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mxfenc.c
  • [DH] tests/ref/fate/copy-trac4914
  • [DH] tests/ref/fate/mxf-reel_name
  • [DH] tests/ref/fate/time_base
  • [DH] tests/ref/lavf/mxf
  • [DH] tests/ref/lavf/mxf_d10
  • [DH] tests/ref/lavf/mxf_dv25
  • [DH] tests/ref/lavf/mxf_dvcpro50
  • [DH] tests/ref/lavf/mxf_opatom
  • [DH] tests/ref/lavf/mxf_opatom_audio

• Downloading Youtube videos frames with FFMPEG without downloading the entire videos [closed]

  11 mars 2023, par zulle99

  I'm wondering if it is possible to download youtube videos frames using FFMPEG and not opencv without downloading the entire videos first. I'm asking this since it is known that opencv is very slow doing this and takes a huge amount of time if the sequence of videos is big like in my use case.

  


• Download youtube video as stream Readable object

  26 décembre 2023, par 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]);


  


  }`