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• How to maximize ffmpeg crop and overlay thousand block in same time ?

  22 juin 2022, par yuno saga

  I try to encrypt a frame of video to random of 16x16 block. so the result will be like artifact video. but exactly it can be decode back. only the creation that know the decode algorithm. but my problem is ffmpeg encode so slow. 3 minutes video, 854x480 (480p) https://www.youtube.com/watch?v=dyRsYk0LyA8. this example result frame that have been filter https://i.ibb.co/0nvLzkK/output-9.jpg. each frame have 1589 block. how to speed up this things ? 3 minutes only 24 frame done. the vido have 5000 thousand frame, so for 3 minutes video it takes 10 hours. i dont know why ffmpeg only take my cpu usage 25%.

  


  const { spawn } = require('child_process');
const fs = require('fs');

function shuffle(array) {
    let currentIndex = array.length,  randomIndex;
  
    // While there remain elements to shuffle.
    while (currentIndex != 0) {
  
      // Pick a remaining element.
      randomIndex = Math.floor(Math.random() * currentIndex);
      currentIndex--;
  
      // And swap it with the current element.
      [array[currentIndex], array[randomIndex]] = [
        array[randomIndex], array[currentIndex]];
    }
  
    return array;
  }

function filter(width, height) {
    const sizeBlock = 16;
    let filterCommands = '';
    let totalBlock = 0;
    const widthLengthBlock = Math.floor(width / sizeBlock);
    const heightLengthBlock = Math.floor(height / sizeBlock);
    let info = [];

    for (let i=0; i < widthLengthBlock; i++) {
        for (let j=0; j < heightLengthBlock; j++) {
            const xPos = i*sizeBlock;
            const yPos = j*sizeBlock;
            filterCommands += `[0]crop=${sizeBlock}:${sizeBlock}:${(xPos)}:${(yPos)}[c${totalBlock}];`;

            info.push({
                id: totalBlock,
                x: xPos,
                y: yPos
            });

            totalBlock += 1;
        }   
    }

    info = shuffle(info);

    for (let i=0; i < info.length; i++) {
        if (i == 0) filterCommands += '[0]';
        if (i != 0) filterCommands += `[o${i}]`;

        filterCommands += `[c${i}]overlay=x=${info[i].x}:y=${info[i].y}`;

        if (i != (info.length - 1)) filterCommands += `[o${i+1}];`;     
    }

    return filterCommands;
}

const query = filter(854, 480);

fs.writeFileSync('filter.txt', query);

const task = spawn('ffmpeg', [
    '-i',
    'C:\\Software Development\\ffmpeg\\blackpink.mp4',
    '-filter_complex_script',
    'C:\\Software Development\\project\\filter.txt',
    '-c:v',
    'libx264',
    '-preset',
    'ultrafast',
    '-pix_fmt',
    'yuv420p',
    '-c:a',
    'libopus',
    '-progress',
    '-',
    'output.mp4',
    '-y'
], {
    cwd: 'C:\\Software Development\\ffmpeg'
});

task.stdout.on('data', data => { 
    console.log(data.toString())
})


  


• Nodebots Day Sydney 2014 (take 2)

  25 juillet 2014, par silvia

  Nodebots Day Sydney 2014 (take 2)

  Category : Array
  Uploaded by : Silvia Pfeiffer
  Hosted : youtube

  The post Nodebots Day Sydney 2014 (take 2) first appeared on ginger’s thoughts.

• ffmpeg audio is stuttering when converting from h264 to mpeg2

  9 février 2019, par user11038211

  I want to convert from h264 stream source (streamlink) to mpeg2 video and send it to a DVB-T modulator (Hides UT100C). So far, I have managed to play the video smoothly, but audio is jerky. It sounds like parts are missing. I think that some parameters are not set perfectly :

  $streamlink -O https://zattoo.com/watch/orf-2 best | ffmpeg -re -i pipe:0 -vcodec mpeg2video -s 720x576 -r 30 -b:v 10M -b:a 64k -acodec mp2 -mpegts_original_network_id 1 -mpegts_transport_stream_id 1 -mpegts_service_id 1 -mpegts_pmt_start_pid 1000 -mpegts_start_pid 1001 -metadata service_provider="HOME" -metadata service_name="IPTV" -muxrate 10M -f mpegts -y tspipe | sudo ./tsrfsend tspipe 0 578000 8000 4 1/2 1/4 8 0 0
  
  
  
  [cli][info] Found matching plugin zattoo for URL https://zattoo.com/watch/orf-2
  
  [cli][info] Available streams: 600k_alt (worst), 600k, 900k, 1500k (best)
  
  [cli][info] Opening stream: 1500k (hls)
  
  Input #0, mpegts, from 'pipe:0':
  
    Duration: N/A, start: 45236.000000, bitrate: N/A
  
    Program 1
  
      Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(progressive), 768x432 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 128 kb/s
  
  
  
  Open /dev/usb-it950x0 ok
  
  g_ITEAPI_TxDeviceInit ok
  
  1 Devices
  
  g_ITEAPI_GetDrvInfo ok
  
  DriverInfo.DriverVerion  = v16.11.10.1
  
  DriverInfo.APIVerion     = 1.3.20160929.0
  
  DriverInfo.FWVerionLink  = 255.39.2.0
  
  DriverInfo.FWVerionOFDM  = 255.9.11.0
  
  DriverInfo.Company       = ITEtech
  
  DriverInfo.SupportHWInfo = Eagle DVBT
  
  DriverInfo.ProductID     = 0x9507
  
  Frequency = 578000 KHz
  
  Bandwidth = 8000 MHz
  
  Constellation: QPSK
  
  Code Rate: 1/2
  
  Interval: 1/4
  
  Transmission Mode: 8K
  
  Output #0, mpegts, to 'tspipe':
  
    Metadata:
  
      service_provider: HOME
  
      service_name    : IPTV
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, 10000 kb/s, 30 fps, 90k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 mpeg2video
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/10000000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 64 kb/s
  
      Metadata:
  
        encoder         : Lavc57.64.101 mp2
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mpeg2video (native))
  
    Stream #0:1 -> #0:1 (aac (native) -> mp2 (native))
  
  Channel Capacity is 4976172 bps
  
  MinGain: -52, MaxGain: 5
  
  frame=    3 fps=0.0 q=2.0 size=      63kB time=00:00:00.38 bitrate=1337.3kbits/s

  Tsrfsend is the application that sends the generated ts stream over a named pipe to the USB modulator.

  I also tried various audio bitrates such as 64, 192, 384k but all is very similar.