Pulseaudio and S/PDIF

[Jerry Geis <jerry.geis@xxxxxxxxx>]

I see the below for list-sources.

Source index 1 is muted.

Source index 2 presents  - TWO -  microphones

I want to MUTE the S/PDIF one ???? 

how do I do that ?

The GUI on Ubuntu 20.04 for the Input shows two items

Digital S/PDIF Webcam and  Webcam.

Muting from GUI - works - but how do I do it from the command line ?

Thanks

Jerry

----

pacmd list-sources
2 source(s) available.
    index: 1
name: <alsa_output.pci-0000_00_1b.0.hdmi-stereo.monitor>
driver: <module-alsa-card.c>
flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 1030
volume: front-left: 0 /   0% / -inf dB,   front-right: 0 /   0% / -inf dB
       balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: yes
current latency: 0.00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
            Stereo
used by: 0
linked by: 0
configured latency: 0.00 ms; range is 16.00 .. 2000.00 ms
monitor_of: 0
card: 1 <alsa_card.pci-0000_00_1b.0>
module: 8
properties:
device.description = "Monitor of Built-in Audio Digital Stereo (HDMI)"
device.class = "monitor"
alsa.card = "0"
alsa.card_name = "HDA Intel PCH"
alsa.long_card_name = "HDA Intel PCH at 0x89414000 irq 126"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:1b.0"
sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
device.bus = "pci"
device.vendor.id = "8086"
device.vendor.name = "Intel Corporation"
device.product.id = "2284"
device.product.name = "Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High Definition Audio Controller"
device.form_factor = "internal"
device.string = "0"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
  * index: 2
name: <alsa_input.usb-046d_Logitech_Webcam_C930e_8E44BAAE-02.iec958-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: RUNNING
suspend cause: (none)
priority: 9048
volume: front-left: 29450 /  45% / -20.84 dB,   front-right: 29450 /  45% / -20.84 dB
       balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 0.62 ms
max rewind: 0 KiB
sample spec: s16le 2ch 48000Hz
channel map: front-left,front-right
            Stereo
used by: 1
linked by: 1
configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
card: 0 <alsa_card.usb-046d_Logitech_Webcam_C930e_8E44BAAE-02>
module: 7
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "1"
alsa.card_name = "Logitech Webcam C930e"
alsa.long_card_name = "Logitech Webcam C930e at usb-0000:00:14.0-2, high speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:14.0-usb-0:2:1.2"
sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.2/sound/card1"
udev.id = "usb-046d_Logitech_Webcam_C930e_8E44BAAE-02"
device.bus = "usb"
device.vendor.id = "046d"
device.vendor.name = "Logitech, Inc."
device.product.id = "0843"
device.product.name = "Webcam C930e"
device.serial = "046d_Logitech_Webcam_C930e_8E44BAAE"
device.form_factor = "webcam"
device.string = "iec958:1"
device.buffering.buffer_size = "384000"
device.buffering.fragment_size = "192000"
device.access_mode = "mmap+timer"
device.profile.name = "iec958-stereo"
device.profile.description = "Digital Stereo (IEC958)"
device.description = "Webcam C930e Digital Stereo (IEC958)"
module-udev-detect.discovered = "1"
device.icon_name = "camera-web-usb"
ports:
iec958-stereo-input: Digital Input (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
properties:

active port: <iec958-stereo-input>