视频音频处理库

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>>> from av_helper import convert_video_to_audio
>>> audio_file_name = convert_video_to_audio('audio_file_in_video_format.mp4')

>>> from av_helper import merge_audio_video as merge_av
>>> output_video = merge_av(audio_file_name, 'video_file_name.mp4')

>>> from av_helper import save_audio_video_file as save_av
>>> save_av(output_video)