extract_animated_gif.js

#!/usr/bin/env node
var request = require('request') ;
var ffmpeg = require('ffmpeg');
var getPixels = require('get-pixels');
var GifEncoder = require('gif-encoder');

const sortAlphaNum = (a, b) => a.localeCompare(b, 'en', { numeric: true })

try {
 // file to extract images from
 var process = new ffmpeg('56884.ts');
 process.then(function (video) {
  console.log(video.metadata);
  video.fnExtractFrameToJPG('extracted/', {
   start_time: null,
   duration_time: video.duration,
   frame_rate: video.fps,
   size: video.resolution,
   number: 100,
   every_n_frames: null,
   every_n_seconds: null,
   every_n_percentage: null,
   keep_pixel_aspect_ratio: false,
   keep_aspect_ratio: false,
   padding_color: 'black',
   file_name: '%t'
 }, function (error, images) {
   if (!error) {
     images = images.sort(sortAlphaNum)
    var file = require('fs').createWriteStream('extracted/img.gif');

    // set headers
    var gif = new GifEncoder(
      video.metadata.video.resolution.w,
      video.metadata.video.resolution.h
    );
    gif.pipe(file);
    gif.setQuality(100);
    gif.setDelay(0);
    gif.writeHeader();

    // stitch to an animate gif
    var addToGif = function(images, counter = 0) {
      getPixels(images[counter], function(err, pixels) {
        gif.addFrame(pixels.data);
        // gif.read();
        if (counter === images.length - 1) {
          gif.finish();
        } else {
          addToGif(images, ++counter);
        }
      })
    }
    addToGif(images);
   } else {
    console.log('Error: ', error);
   }
  });
 }, function (err) {
  console.log('Error: ', err);
 });
} catch (e) {
 console.log('Error: ', e);
}