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Old 05-24-2017, 06:30 PM   #1
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Question Capturing microphone and speaker concurrently (preferably to individual stereo channels) from CLI script via pulseaudio?

Capturing microphone and speaker concurrently (preferably to individual stereo channels) from CLI script via pulseaudio?

Hey folks! I posted this over on the Raspberry Pi subreddit and the Linux Questions subreddits, but alas I got no responses. I think perhaps folks didn't know the answer and so didn't reply, I'm hoping someone here might have some idea?

I'm working on a project that's almost 100% complete bar this key issue. I've hunted around and tried a few things but I've not figured out how to record the system sound output, and I've not figured out how to do both that and the mic reliably at the same time?

Oh in case it's important, they're both going to be in use already at the time that I want to jump in and record, so I hope there's not going to be any conflict issues!?

I don't mind if it requires stitching two audio files together after the fact as long as they're in sync, a little post processing is no harm (I've figured out how to do that part already, though my notes have been lost on a faulty hard drive last week actually so... any reminder would be extremely welcome! ). Though I'd rather be able to do it during recording if possible. The project will be headless, so I need a solution that requires no human interaction.

I'd like the mic to be on one stereo channel and the speaker output on the other, I'd rather not downmix them together.

I'm running Raspbian on a Pi3, and using a USB sound device that has a mic & speaker. If you need any more info to point me in the right direction let me know. I can tinker and figure things out, but only if I know what I'm doing to begin with....and pulseaudio is kinda confusing! :P

Oh! Importantly - I've got ExaGear Desktop too, so I can run debian x86 applications pretty comfortably too. There's some emulation overhead though, so I'd rather avoid running more non-native stuff if I can help it

Thanks in advance for the help!!
Old 05-25-2017, 10:56 AM   #2
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An old post, but the solutions that worked then should work now

This may help


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