type Variant = {
  kind: "video_mp4";
  size: number;
  key: string;
};

type PlaybackInput = {
  originalMimeType: string | null | undefined;
  variants: Variant[];
};

export function pickVideoPlaybackVariant(
  input: PlaybackInput,
): { kind: "video_mp4"; size: number } | null {
  const mp4Variant = input.variants.find(
    (variant) => variant.kind === "video_mp4" && variant.size === 720,
  );
  if (mp4Variant) {
    return { kind: "video_mp4", size: mp4Variant.size };
  }
  return null;
}