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audio_download_create_youtube_3.py
def combine_audio(video, speech, audio):
os.system(f'ffmpeg -i {video} -i {speech} -filter_complex "[0:a]volume=0.4[a0]; [1:a]volume=0.9[a1]; [a0][a1]amix=duration=longest[a]" -map 0:v -map "[a]" -c:v copy overlayAudio.mp4')
os.system(f'ffmpeg -i {video} -i {audio} -filter_complex "[0:a]volume=0.0[a0]; [1:a]volume=1.0[a1]; [a0][a1]amix=duration=longest[a]" -map 0:v -map "[a]" -c:v copy substituteAudio.mp4')
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