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Old

ffmpeg alsa recording multiple applications audio

Posted 01-28-2016 at 10:56 PM by number22
Updated 02-07-2016 at 03:30 AM by number22

The trick is using dmix on loopback device:
2 dmixers; one for regualr onboard audio; the other for loopback virtual device, then duplicates streams send to onboard audio card, so you can hear what is being sent to loopback device.

Need to load snd_aloop module first;

Code:
modprobe snd-aloop index=2 id=Loopback pcm_substreams=1 enable=1
My first audio device is onboard soundcard; 2nd is HDMI card, so I put index=2 for Loopback device.

file...
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Old

In praise of ALSA and alsaequal

Posted 08-14-2011 at 03:55 AM by William (Dthdealer) (Whaling the FOSS)
Updated 08-14-2011 at 03:58 AM by William (Dthdealer)

After a long overdue apt-get upgrade, I am now the happy owner of one more volume slider in alsamixer: headphone.

On a related note, 'alsaequal', a graphic equaliser for ALSA is a really under appreciated tool. I have set it to my default alsa device through .asoundrc:

Code:
ctl.equal {
        type equal;
}

pcm.plugequal {
        type equal;
        # Modify the line below if you don't
        # want to use sound card
...
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Old

Load multiple soundcard drivers in order

Posted 06-07-2011 at 08:16 AM by DJ Shaji

I recently bought a SoundBlaster Live! 5.1vx to record music in full 24 bits per sample, and so now I have two soundcards - one PCI card and one built-in on the motherboard.

One issue that had been bugging me for a while - not that problematic, but an issue nonetheless - I have Fedora 14 - because modern distros search for and load modules in parallel to speed up the boot process, the result is that the order in which modules will be loaded becomes unpredictable. So, the soundcards...
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Old

Sound on flash and everywhere else at the same time, in Arch

Posted 08-13-2010 at 12:57 PM by the dsc (linux-related notes)
Tags alsa, arch, flash, oss, sound

There had been a weird problem with sound on Arch. Whenever there was a flash item being displayed (or perhaps flash using sound, I suppose), there would be no sound elsewhere. And if there were sound elsewhere, whenever you play something on flash, it would conversely be mute.

The fix is quite simple:

Quote:
Originally Posted by Wilco
After having some troubles with alsa I managed to fix this once and for all. The problem was I could not run flash+firefox and some other application that uses sound,
...
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