obs-slideshow.js

const fs = require('fs')

function gifsInDir(dir) {
  try {
    return fs.readdirSync(dir).filter(value => {
      return value.match(/\.gif$/)
    })
  } catch (err) {
    console.dir(err)
    return []
  }
}

function writeRandomGif(dir, target) {
  const gifs = gifsInDir(dir)
  const randomGif = gifs[Math.floor(Math.random() * gifs.length)]

  console.log(`Writing ${randomGif} to ${target}`)

  try {
    return fs.copyFileSync(randomGif, target)
  } catch (err) {
    console.dir(err)
    return []
  }
}

setInterval(
  writeRandomGif,
  10000,
  process.cwd(),
  `${process.cwd()}/obs-slideshow.gif`
)