from moviepy.editor import VideoFileClip, AudioFileClip
import random

def combine_audio_video(audio_file, video_file, output_file):
    # Load the audio and video files
    audio = AudioFileClip(audio_file)
    video = VideoFileClip(video_file)

    # Get the duration of the audio and video files
    audio_duration = audio.duration
    video_duration = video.duration

    # Generate a random start time for the video clip
    start_time = random.uniform(0, video_duration - audio_duration)

    # Trim the video to match the audio duration and start from the random point
    trimmed_video = video.subclip(start_time, start_time + audio_duration)

    # Combine the trimmed video and audio
    final_clip = trimmed_video.set_audio(audio)

    # Write the combined clip to a new video file
    final_clip.write_videofile(output_file)

    # Close the audio and video files
    audio.close()
    video.close()
    final_clip.close()