subprocess.call() in Python

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senmeis

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Hi,

I want to use

Python: 
subprocess.call(["ffmpeg", "-i", "test.mp4", "test.mp3"])

to make a media conversion.

Question: how can I redirect the console output so that this can be outputted with „print()“?
 

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I tried the following two alternatives:



Alternative 1:

Python: 
out = subprocess.run(["ffmpeg", "-i", "test.mp4", "test.mp3"], capture_output=True, text=True, shell=True)
print(out.stdout)



Alternative 2:

Python: 
out = subprocess.check_output(["ffmpeg", "-i", "test.mp4", "test.mp3"], shell=True)
print(out.decode('utf-8'))


but both don’t print out anything. I just want to get the process info which comes from the console when ffmpeg is executed.
 

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You can use the subprocess.PIPE to redirect the console output to your program. For example:

process = subprocess.Popen(["ffmpeg", "-i", "test.mp4", "test.mp3"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
Code: 
for line in iter(process.stdout.readline, b''):
    print(line.decode('utf-8').rstrip())
 

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