Moviepy kann das Bilddateiformat nicht lesen

def images_to_video(image_folder_path: str, fps, extension:str, video_name:str, output_format:str):
    
    import os
    import moviepy.video.io.ImageSequenceClip
    
    images = [image_folder_path+'/'+img for img in os.listdir(image_folder_path) if img.endswith(extension)]
    movie_clip = moviepy.video.io.ImageSequenceClip.ImageSequenceClip(images, fps)
    movie_clip.write_videofile(video_name+output_format)
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