Function analyzeKeyframeIntervals

packages/engine/src/utils/ffprobe.ts:405–417

(filePath: string)

 * yt-dlp --download-sections or screen recordings often have sparse keyframes.
 */
export async function analyzeKeyframeIntervals(filePath: string): Promise<KeyframeAnalysis> {
  const cached = keyframeCache.get(filePath);
  if (cached) return cached;

  const promise = analyzeKeyframeIntervalsUncached(filePath);
  keyframeCache.set(filePath, promise);
  promise.catch(() => {
    if (keyframeCache.get(filePath) === promise) {
      keyframeCache.delete(filePath);
    }
  });
  return promise;
}

async function analyzeKeyframeIntervalsUncached(filePath: string): Promise<KeyframeAnalysis> {
  const stdout = await runFfprobe([