CODEWITHSUNDEEP
pythonbackgroundsubprocessaudio-recording
Max Marwin
Max Marwin

Reputation: 71

Background Process subprocess.Popen with Pipe

I'm trying to record and convert a stream with python using arecord.

In the shell this is a command more or less like:

arecord -B 5000 -f dat | lame -m j -q 5 -V 2 - test.mp3 &

In Python I tried this with subprocess.Popen:

reccmd = ["arecord", "-B", "5000", "-f", "dat"]
mp3cmd = ["lame", "-m", "j", "-q", "5", "-V", "2", "-", "test.mp3"]
p = subprocess.Popen(reccmd, stdout=subprocess.PIPE)
p2 = subprocess.Popen(mp3cmd, stdin=p.stdout)
p2.communicate()

But I don't know how to include the "&" or something similar in the code to be able to stop the recording with a

killall arecord command

Upvotes: 7

Views: 6628

Answers (1)

Sven Marnach
Sven Marnach

Reputation: 602465

If you don't want the main Python process to block while executing the subprocesses, simply don't call p2.communicate(). The calls to subprocess.Popen() don't block.

Upvotes: 9

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