Function stripBeforeOnset

packages/cli/src/whisper/normalize.ts:484–488

(words: Word[], onsetSeconds: number)

 * Whisper can hallucinate words over non-speech sections at the start of audio.
 */
export function stripBeforeOnset(words: Word[], onsetSeconds: number): Word[] {
  // 0.5s tolerance: keep words whose timestamps straddle the onset boundary,
  // since whisper may assign a slightly early start to the first spoken word.
  return words.filter((w) => w.start >= onsetSeconds - 0.5);
}

export function patchCaptionHtml(dir: string, words: Word[]): void {
  if (words.length === 0) return;