ffmpeg xstack javascript layout tool

ffmpeg-xstack.js

const range = (N) => [...Array(N).keys()];
const outer = ([v1, v2]) => v1.map((x) => v2.map((y) => `${x}_${y}`));
const tile = (N, fn) =>
  range(N).map((i, _, arr) => arr.slice(0, i).map(fn).join("+") || 0);
const layout = (N) =>
  outer([tile(N, (k) => `w${k * N}`), tile(N, (k) => `h${k}`)])
    .flat()
    .join("|");