Voiceover

node --strip-types generate-voiceover.ts

const response = await fetch(
  `https://api.elevenlabs.io/v1/text-to-speech/${voiceId}`,
  {
    method: "POST",
    headers: {
      "xi-api-key": process.env.ELEVENLABS_API_KEY!,
      "Content-Type": "application/json",
      Accept: "audio/mpeg",
    },
    body: JSON.stringify({
      text: "Welcome to the show.",
      model_id: "eleven_multilingual_v2",
      voice_settings: {
        stability: 0.5,
        similarity_boost: 0.75,
        style: 0.3,
      },
    }),
  },
);

const audioBuffer = Buffer.from(await response.arrayBuffer());
writeFileSync(`public/voiceover/${compositionId}/${scene.id}.mp3`, audioBuffer);

import { CalculateMetadataFunction, staticFile } from "remotion";
import { getAudioDuration } from "./get-audio-duration";

const FPS = 30;

const SCENE_AUDIO_FILES = [
  "voiceover/my-comp/scene-01-intro.mp3",
  "voiceover/my-comp/scene-02-main.mp3",
  "voiceover/my-comp/scene-03-outro.mp3",
];

export const calculateMetadata: CalculateMetadataFunction<Props> = async ({
  props,
}) => {
  const durations = await Promise.all(
    SCENE_AUDIO_FILES.map((file) => getAudioDuration(staticFile(file))),
  );

  const sceneDurations = durations.map((durationInSeconds) => {
    return durationInSeconds * FPS;
  });

  return {
    durationInFrames: Math.ceil(sceneDurations.reduce((sum, d) => sum + d, 0)),
  };
};