提取视频（去音频）
cmdLine='ffmpeg -i temp.mp4 -vcodec copy -an mav.mp4'
returnCmd = subprocess.call(cmdLine, shell=True)
print(returnCmd)
提取音频（aac m4a）
cmdLine='ffmpeg -i temp.mp4 -acodec copy -vn temp.m4a'
returnCmd = subprocess.call(cmdLine, shell=True)
print(returnCmd)
转mp3格式
cmdLine='ffmpeg -i temp.m4a temp.mp3 -y'
returnCmd = subprocess.call(cmdLine, shell=True)
print(returnCmd)
或者直接提取mp3
cmdLine='ffmpeg -i temp.mp4 temp.mp3 -y'
returnCmd = subprocess.call(cmdLine, shell=True)
print(returnCmd)
然后发现mp3格式的音频时长对不上
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