使用Python的FFmpeg和MoviePy合并音视频时的音频截断/循环问题

我正在编写代码实现音频文件与背景视频的时长同步，但当裁剪背景视频以匹配音频时长时，生成的合并视频末尾会出现约0.2秒的音频截断或最后语句循环的问题。不执行裁剪步骤时，代码运行完全正常。

我使用Ubuntu 20.04系统和FFmpeg 4.2.7版本，已经尝试过修改编码格式、裁剪音频前后0.2秒或添加静音段，均无法解决问题。看到不少人遇到类似情况，请问有没有人解决过这个问题？

我的代码如下：

def merge_videos_with_subs(
    background_path, audio_path, subs, output_directory, output_filename
):
    try:
        # Load background video and audio
        background_clip = VideoFileClip(background_path)
        background_clip = background_clip.without_audio()
        audio_clip = AudioFileClip(audio_path)

        # Adjust video duration to match audio duration
        audio_duration = audio_clip.duration

        # If the background video is longer, trim it to match the audio duration
        if background_clip.duration > audio_duration:
            background_clip = background_clip.subclip(0, audio_duration)
        # If the audio is longer, loop the background video
        else:
            background_clip = background_clip.loop(duration=audio_duration)

        # Set audio of the background clip
        background_clip = background_clip.set_audio(audio_clip)

        # Overlay subtitles on the video
        final_clip = CompositeVideoClip(
            [background_clip, subtitles.set_pos(("center", "bottom"))]
        )

        # Ensure the output directory exists
        os.makedirs(output_directory, exist_ok=True)

        # Define the output path
        output_path = os.path.join(output_directory, output_filename)

        # Write the merged video with subtitles
        final_clip.write_videofile(
            output_path, codec="libx264", audio_codec="aac", threads=4, fps=24
        )

        # Close the clips
        final_clip.close()
        background_clip.close()
        audio_clip.close()

        print(f"Merged video with subtitles saved to: {output_path}")
    except Exception as e:
        print(f"Error merging videos: {e}")

内容的提问来源于stack exchange，提问作者Stevenb123