Function aggregateStats

server.js:532–547

(frames)

}

function aggregateStats(frames) {
  let sum = 0;
  let sumSq = 0;
  let count = 0;
  for (const frame of frames) {
    for (let i = 0; i < frame.length; i += 1) {
      const value = frame[i];
      sum += value;
      sumSq += value * value;
      count += 1;
    }
  }
  const mean = sum / Math.max(1, count);
  const variance = sumSq / Math.max(1, count) - mean * mean;
  return { mean, std: Math.sqrt(Math.max(0, variance)) || 1 };
}

function fullClipToneRecommendation(video1Frames, video2Frames, fps) {
  return toneFromStats(aggregateStats(video1Frames), aggregateStats(video2Frames), fps, "full");