Date: Sat, 26 Apr 2025 08:47:28 -0700 From: Carl Johnson <carlj@peak.org> To: freebsd-questions@freebsd.org Subject: Re: How to record audio from multiple mixer(8) devices simultaneously Message-ID: <86h62a2acv.fsf@bay.localnet> In-Reply-To: <20250426000125.db4e9ac0ac4ed2c2ae6fdb1e@bk.ru> (Artem Bunichev's message of "Sat, 26 Apr 2025 00:01:25 %2B0300") References: <20250426000125.db4e9ac0ac4ed2c2ae6fdb1e@bk.ru>
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Artem Bunichev <tembun@bk.ru> writes: > Hi! > > I'm running FreeBSD 14-STABLE on ThinkPad X220 and I want to record sound from > the integrated microphone and the system sound (sound from applications) at the > same time. So far, I've figured how to record only one of them at a time: I > can do this by means of setting the recording device in mixer(8). If I want > to record from microphone, I do: mixer monitor.recsrc=set, and if I want to > record the desktop sound, I do: mixer mic.recsrc=set. As I understand, > recording device sets the device, which output I will get when I read > from /dev/dsp. > > Actually, I want to record an audio for screencast, which I do with: > ffmpeg -f x11grab -i :0 -f oss -i /dev/dsp -vcodec libx264 -preset fast out.mkv. > > So, I guess I need to find a way to make both sound from microphone and system > sound go into /dev/dsp. But I don't know how to do this, since as I can see in > mixer(8), only _one_ device can be used for recording. > > Here's the output of /dev/sndstat: > Installed devices: > pcm0: <Conexant CX20590 (Analog 2.0+HP/2.0)> (play/rec) default > pcm1: <Intel Cougar Point (HDMI/DP 8ch)> (play) > pcm2: <Intel Cougar Point (HDMI/DP 8ch)> (play) > pcm3: <Intel Cougar Point (HDMI/DP 8ch)> (play) > No devices installed from userspace. > > The output of mixer: > pcm0:mixer: <Conexant CX20590 (Analog 2.0+HP/2.0)> on hdaa0 (play/rec) (default) > vol = 1.00:1.00 pbk > pcm = 1.00:1.00 pbk > speaker = 1.00:1.00 pbk > mic = 1.00:1.00 rec > rec = 1.00:1.00 pbk > monitor = 0.37:0.37 rec src > > Is the thing I want to do is even possible? If yes, how can I do that? I don't know if you have an answer yet, but the virtual_oss port (or package) looks like it would probably allow you to do what you want. Hope that helps. -- Carl Johnson carlj@peak.org
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