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• vc2enc: calculate the minimum slice size only once

  26 February 2016, by Rostislav Pehlivanov

  vc2enc: calculate the minimum slice size only once
  This commit moves the minimum bits per slice calculations outside of the
  
  rate control function as it is identical for every slice.
  Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/vc2enc.c

• Node js request huge amount of pictures

  5 January 2019, by Manos Koutselakis

  I am trying to request a huge amount of images on node js (n > 3000)
  and then save them into a folder.
  I have tried using request library and request-promise.
  The problem is that if the number of pictures is too big some pictures do not complete downloading, leaving incomplete data or get an error(an empty .jpeg file). Is there a better way of downloading huge amounts of pictures?
  Also i need when the pictures all download to request a function compile()
  to make them into a video. I am using ffmpeg for that.

  Below are 2 ways i tried doing this.

  const req = require('request');
  
  const request = require('request-promise');
  
  const fs = require('fs');
  
  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
  
  const ffmpeg = require('fluent-ffmpeg');
  
  ffmpeg.setFfmpegPath(ffmpegPath);
  
  
  
  function downloadImgs(imgUrls) {
  
    let promises = [];
  
    let prom;
  
    for (let i = 0; i < imgUrls.length; i++) {
  
      imgPath = `assets/pics/st_${pad(i + 1, 3)}.jpg`
  
  
  
      prom = request(imgUrls[i]);
  
      prom.on('error', () => console.log('err'));
  
      prom.pipe(fs.createWriteStream(imgPath));
  
      promises.push(prom);
  
    }
  
  
  
    Promise.all(promises).then(() => {
  
      console.log('I Run');
  
      compilee();
  
    });
  
  
  
    //SECOND TRY-----------------------------------------
  
    for (let i = 0; i < imgUrls.lengh; i++) {
  
      imgUrl = imgUrls[i];
  
      req(imgUrl)
  
        .on('error', () => console.log("img error", imgUrl))
  
        .pipe(fs.createWriteStream(`assets/pics/st_${pad(i + 1, 3)}.jpg`)).on('close', () => {
  
          console.log('downloaded', x)
  
        })
  
    }
  
    compilee();
  
  
  
  //---------------------------------------------------------
  
  
  
    function compilee() {
  
      command
  
        .on('end', onEnd)
  
        // .on('progress', onProgress)
  
        .on('error', onError)
  
        .input('assets/pics/st_%03d.jpg')
  
        .inputFPS(5)
  
        .output('assets/output/pepe.mp4')
  
        .outputFps(30)
  
        .run();
  
    }

  The errors i am getting for the first: UnhandledPromiseRejectionWarning: RequestError: Error: socket hang up

  and the second :
  Error: socket hang up
  at createHangUpError (_http_client.js:330:15)
  at TLSSocket.socketOnEnd (_http_client.js:433:23)
  at TLSSocket.emit (events.js:187:15)
  at endReadableNT (_stream_readable.js:1098:12)
  at process.internalTickCallback
  (internal/process/next_tick.js:72:19) code: ’ECONNRESET’ }

  Also, should i download the pictures on the server or on the client if i want to sent the video to the client immediately.

• concatdec: calculate duration early if outpoint is known

  24 October 2015, by Marton Balint

  concatdec: calculate duration early if outpoint is known
  Reviewed-by: Nicolas George <george@nsup.org>
  
  Signed-off-by: Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/concatdec.c