init.js

   1 const fs = require("fs").promises
   2 const seurat = require("seurat")
   3 const ffmpegExtractFrames = require("ffmpeg-extract-frames")
   4 const imageSize = require("image-size")
   5
   6 const fps = 1.0
   7 const limit = 2000
   8 const url = "https://www.youtube.com/watch?v=9lNZ_Rnr7Jc"
   9
  10 fs.rm("frames", {recursive: true, force: true})
  11         .then(_ => fs.mkdir("frames"))
  12         .then(_ => ffmpegExtractFrames({
  13                 input: "bad_apple.mkv",
  14                 output: "frames/%5d.png",
  15                 fps
  16         }))
  17         .then(_ => fs.readdir("frames"))
  18         .then(files => {
  19                 const dimensions = imageSize("frames/00001.png")
  20                 const ratio = dimensions.width / dimensions.height
  21                 const size = Math.sqrt(limit)
  22
  23                 return Promise.all(files.map(file =>
  24                         seurat.convert("frames/" + file, {
  25                                 width:  Math.floor(size * ratio),
  26                                 height: Math.floor(size / ratio),
  27                                 threshold: 25,
  28                         })))
  29         })
  30         .then(frames => fs.writeFile("badapple.json", JSON.stringify({fps, frames})))
  31 /**/