提取視頻（去音頻）
cmdLine='ffmpeg -i temp.mp4 -vcodec copy -an mav.mp4'
returnCmd = subprocess.call(cmdLine, shell=True)
print(returnCmd)
提取音頻（aac m4a）
cmdLine='ffmpeg -i temp.mp4 -acodec copy -vn temp.m4a'
returnCmd = subprocess.call(cmdLine, shell=True)
print(returnCmd)
轉(zhuǎn)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)
然后發(fā)現(xiàn)mp3格式的音頻時長對不上
