Crash when recording in small chunks (only on Linux).

[janleskovec]

When recording with small numframes (below 2400 or so) I get the following error: Assertion 's' failed at pulse/stream.c:1411, function pa_stream_connect_record(). Aborting. Aborted (core dumped)

[bastibe]

Can you send me some example code so I can reproduce the issue?

[janleskovec]

Here it is:

import soundcard

input = soundcard.all_microphones(include_loopback=True)[0]

samplerate = 48000
chunk = 2400

while True:
	data = input.record(chunk, samplerate)
	print("recorded data")

[janleskovec]

OK, i guess that isn't the intended use-case and it works when using:

import soundcard

input = soundcard.all_microphones(include_loopback=True)[0]

samplerate = 48000
chunk = 2400

with input.recorder(samplerate) as mic:
    while True:
        data = mic.record(chunk)
        print("recorded data")

It would probably still be a good idea to find what is the problem.

[bastibe]

Yes, that would explain it. Depending on your native block size, the record method will return instantly, and flood pulseaudio with new instances.

I will close this issue, and investigate this further in #28.

[drscotthawley]

I just tried my oscilloscope app (which works fine on Mac) on Linux, and got exactly this error. But increasing numframes from 1024 to as large as 4096 doesn't fix the error, the assertion still fails.
Used a brand-new install of soundcard via pip. Should I open up a new issue or do you want to reopen this one?

[bastibe]

Please open a new issue with a piece of example code and the exact error message.