在Python中使用ffmpeg即时将mp3转换为wav

Question

I'm trying to convert a mp3 file on the fly in Python to wav file using ffmpeg.

I call it using subprocess, how can I get it's output to play it as wav on the fly wthout saving it as the file (or playing it while its converting) and then playing it?

This is what I have so far:

I'm using aplay just for a example.

FileLocation = "/home/file.mp3"

subprocess.call(["ffmpeg", "-i", FileLocation etc etc "newfail.wav"])
os.system("aplay ... ") #play it on the fly here

As far as I understand, if I put "-" as file name, it will output it instead to stdout, but I don't know how to read stdout...

Answer 1

To emulate source arg1 arg2 | sink source arg1 arg2 | sink shell command without the shell:

from subprocess import Popen, PIPE

source = Popen(['source', 'arg1', 'arg2'], stdout=PIPE)
sink = Popen(['sink'], stdin=source.stdout)
source.stdout.close()
source.wait()
sink.wait()