isGifAnimated example

        $previouslyDetectedType->addFlags(self::SUPPORTED_FILE_EXTENSIONS[$fileExtension]);
        $this->addAnimatedFlag($mediaFile, $previouslyDetectedType);

        return $previouslyDetectedType;
    }

    private function addAnimatedFlag(MediaFile $mediaFile, MediaType $rootType): void
    {
        $fileExtension = mb_strtolower($mediaFile->getFileExtension());
        if ($fileExtension === 'gif' && $this->isGifAnimated($mediaFile->getFileName())) {
            $rootType->addFlag(ImageType::ANIMATED);
        }

        if ($fileExtension === 'webp' && $this->isWebpAnimated($mediaFile->getFileName())) {
            $rootType->addFlag(ImageType::ANIMATED);
        }
    }

    /** * an animated gif contains multiple "frames", with each frame having a * header made up of: * * a static 4-byte sequence (\x00\x21\xF9\x04) * * 4 variable bytes * * a static 2-byte sequence (\x00\x2C) (some variants may use \x00\x21) * * We read through the file till we reach the end of the file, or we've found * at least 2 frame headers */