Arch Linux

Haarry

Member

Registered: 2019-02-04

Posts: 1

Problems with an 8-channel interface, pulseaudio, Firefox and Youtube.

I'm having the same issue to edward.81 in "Firefox, no sound from some video.".
I figured I better not bump it since they don't describe their setup.. I'm unable to hear any audio out of either of the following videos when I use Firefox, the problem doesn't happen with Chromium:
https://www.youtube.com/watch?v=QRYzre4bf7I
https://www.youtube.com/watch?v=Ucjn6HCd2zI

The problem happens with some other videos too, probably about 5% of the videos I watch, sometimes it can be resolved by reducing video quality but I don't really want to do that..

I'm using a Steinberg UR824 interface and it looks like pulseaudio thinks it's an 8.1 system.. It is listed as "Multichannel audio" in pulsemixer and using pavumeter I managed to see that these videos are playing out of channel 5 "Front center". If I swap a cable to channel 5 I can hear the audio. I only have stereo monitors and don't want this to happen.

I tried creating a copy of /etc/pulse/daemon.conf at ~/.config/pulse/daemon.conf and editing the following fields:

enable-remixing = no
default-sample-channels = 2
default-channel-map = front-left,front-right

Here's the output of pacmd list-sinks while the video is playing.

1 sink(s) available.
  * index: 0
	name: <alsa_output.usb-Yamaha_Corporation_Steinberg_UR824-01.multichannel-output>
	driver: <module-alsa-card.c>
	flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
	state: RUNNING
	suspend cause: (none)
	priority: 9040
	volume: front-left: 66191 / 101% / 0.26 dB,   front-right: 66191 / 101% / 0.26 dB,   rear-left: 66191 / 101% / 0.26 dB,   rear-right: 66191 / 101% / 0.26 dB,   front-center: 66191 / 101% / 0.26 dB,   lfe: 66191 / 101% / 0.26 dB,   side-left: 66191 / 101% / 0.26 dB,   side-right: 66191 / 101% / 0.26 dB,   aux0: 66191 / 101% / 0.26 dB,   aux1: 66191 / 101% / 0.26 dB,   aux2: 66191 / 101% / 0.26 dB,   aux3: 66191 / 101% / 0.26 dB,   aux4: 66191 / 101% / 0.26 dB,   aux5: 66191 / 101% / 0.26 dB,   aux6: 66191 / 101% / 0.26 dB,   aux7: 66191 / 101% / 0.26 dB,   aux8: 66191 / 101% / 0.26 dB,   aux9: 66191 / 101% / 0.26 dB,   aux10: 66191 / 101% / 0.26 dB,   aux11: 66191 / 101% / 0.26 dB,   aux12: 66191 / 101% / 0.26 dB,   aux13: 66191 / 101% / 0.26 dB,   aux14: 66191 / 101% / 0.26 dB,   aux15: 66191 / 101% / 0.26 dB,   aux16: 66191 / 101% / 0.26 dB,   aux17: 66191 / 101% / 0.26 dB
	        balance 0.00
	base volume: 65536 / 100% / 0.00 dB
	volume steps: 65537
	muted: no
	current latency: 29.36 ms
	max request: 91 KiB
	max rewind: 91 KiB
	monitor source: 0
	sample spec: s24le 26ch 48000Hz
	channel map: front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7,aux8,aux9,aux10,aux11,aux12,aux13,aux14,aux15,aux16,aux17
	used by: 1
	linked by: 3
	configured latency: 25.00 ms; range is 0.50 .. 280.06 ms
	card: 1 <alsa_card.usb-Yamaha_Corporation_Steinberg_UR824-01>
	module: 7
	properties:
		alsa.resolution_bits = "24"
		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 = "2"
		alsa.card_name = "Steinberg UR824"
		alsa.long_card_name = "Yamaha Corporation Steinberg UR824 at usb-0000:0a:00.0-2, high speed"
		alsa.driver_name = "snd_usb_audio"
		device.bus_path = "pci-0000:0a:00.0-usb-0:2:1.1"
		sysfs.path = "/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/0000:06:01.0/0000:08:00.0/0000:09:00.0/0000:0a:00.0/usb5/5-2/5-2:1.1/sound/card2"
		udev.id = "usb-Yamaha_Corporation_Steinberg_UR824-01"
		device.bus = "usb"
		device.vendor.id = "0499"
		device.vendor.name = "Yamaha Corp."
		device.product.id = "1505"
		device.product.name = "Steinberg UR824"
		device.serial = "Yamaha_Corporation_Steinberg_UR824"
		device.string = "hw:2"
		device.buffering.buffer_size = "1048554"
		device.buffering.fragment_size = "524238"
		device.access_mode = "mmap+timer"
		device.profile.name = "multichannel-output"
		device.profile.description = "Multichannel"
		device.description = "Steinberg UR824 Multichannel"
		alsa.components = "USB0499:1505"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card-usb"
	ports:
		multichannel-output: Multichannel Output (priority 0, latency offset 0 usec, available: unknown)
			properties:
				
	active port: <multichannel-output>

misc info:

Mozilla Firefox 65.0.2
pulseaudio 12.2

I've restarted the system each time I change the config but nothing seems to be happening.. It is the location that man pulse-daemon.conf says I should use and i've set the permissions so my user can read it.
Help?