Broken audio capture subsystem

[navycat]

In Impish the problem of capturing audio by discord (from app or browser does not matter) when broadcasting reappeared.
The window is being captured or not - it doesn't matter.
It looks like a regression.

Webcamoid don't capture sound from micro too.

If I set gstreamer method instead of ffmpeg 4.4 then sound appears, but very laggy
Discord launched in a browser and streaming an adjacent tab does the same.
I don't even know what to report on. Looks like a broken audio capture subsystem.

ffmpeg -f alsa -i <record device> -t 30 out.wav and ffmpeg -f pulse -i <record device> -t 30 out.wav captures sound normally.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-16-generic 5.13.0-16.16
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: navycat 2083 F.... pulseaudio
 /dev/snd/controlC0: navycat 2083 F.... pulseaudio
 /dev/snd/controlC1: navycat 2083 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Mon Sep 27 05:06:06 2021
InstallationDate: Installed on 2021-05-28 (121 days ago)
InstallationMedia: Ubuntu-MATE 21.10 "Impish Indri" - Alpha amd64 (20210526)
IwConfig:
 lo no wireless extensions.

 eno1 no wireless extensions.
MachineType: BASE_BOARD_MANUFACTURER MODEL_NAME
ProcFB: 0 nouveaudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-16-generic root=UUID=bc8287ed-7647-42ae-8f04-6297f1c30b1d ro nouveau.noaccel=1 nouveau.nofbaccel=1 quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-16-generic N/A
 linux-backports-modules-5.13.0-16-generic N/A
 linux-firmware 1.200
RfKill:
 0: hci0: Bluetooth
  Soft blocked: yes
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/09/2018
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 150-SE-E789
dmi.board.vendor: EVGA
dmi.board.version: Patsburg
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/09/2018:br4.6:svnBASE_BOARD_MANUFACTURER:pnMODEL_NAME:pvrBASE_BOARD_VERSION:skuPROJECT_SUB_TAG:rvnEVGA:rn150-SE-E789:rvrPatsburg:
dmi.product.family: X86 AT
dmi.product.name: MODEL_NAME
dmi.product.sku: PROJECT_SUB_TAG
dmi.product.version: BASE_BOARD_VERSION
dmi.sys.vendor: BASE_BOARD_MANUFACTURER

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Kai-Heng Feng (kaihengfeng)]

Does the issue happen when using `arecord` and `aplay`?

[navycat (navycatt)]

In general descriprion i said "ffmpeg -f alsa -i <record device> -t 30 out.wav and ffmpeg -f pulse -i <record device> -t 30 out.wav captures sound normally."