this post was submitted on 26 Sep 2023
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[Resolved] Missing audio with MPV + Wayland (lemmy.cafe)
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
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So I know my setup is really niche, but here goes nothing

  • I am using Arch Pi on Pi 4
  • Installed cage as a lightweight Wayland compositor
  • Installed mpv + wireplumber + pipewire

I am not quite sure how to use cage to launch a simple "Wayland session (if it even makes sense)", so that I can send MPV to that display. So I tried cage -s alacritty :1, and it does launch alacritty with it detecting that it is on wayland.

But when I do DISPLAY=:1 mpv ...., the video runs, but there's no audio. Also there's no errors shown on mpv either.

The other thing of note is that I tried cage -s Xwayland :1 and the audio+video works perfectly.

So in all:

  1. How do I launch cage to spawn a simple Wayland session? Is this even possible?
  2. How do I solve the audio issue on Wayland?

EDIT: Thanks all for the help. After some investigation, I found out the pipewire somehow is not ran on startup of alacritty, but it did for Xwayland. I noticed that the first play of the video would be audio-less on alacritty, and subsequent ones are fine. It seems like the first run causes pipewire to be started and thus I wrongfully assumed that the daemon was running.

Still strange nonetheless...

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[–] [email protected] 4 points 1 year ago* (last edited 1 year ago) (1 children)

It's possible you didn't install pipewire-pulse, or didn't start/enable a service.

Btw fun fact: you can use mpv --gpu-context=drm in a tty to watch a video directly from the framebuffer.

[–] [email protected] 1 points 1 year ago

That shouldn't be the problem since I'm using pipewire and it is working in the Xwayland session. When I launch into alacritty, I also checked that pipewire + wireplumber were both active

[–] anonymous_bot 2 points 1 year ago (1 children)

Have you tried with a different compositor first to rule out whether cage is the issue? For example try sway.

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago) (1 children)

I tried with cage + Xwayland and that works perfectly, so I highly doubt that is the issue. Maybe it is something to do with cage + alacritty that is causing it, but I'm not too well versed in the Wayland stuff to know if spawning a terminal application may somehow not support audio.

[–] anonymous_bot 1 points 1 year ago

Like I said we should try a different compositor just to rule it out.

[–] [email protected] 1 points 1 year ago (1 children)

I imagine these are two separate issues. I'll attack the audio as I don't know much about cage, albeit, are you running it from a tty on login or do you have a display manager (e.g. gdm, sddm)

Can you dump your installed packages with pacman -Qe and post it here? I'll compare it to mine.

My audio setups have been pretty... interesting in the past. Normally, I prefer to do everything in the terminal, but pavucontrol can be pretty handy.

Other than that, you might try reading the man page for pactl.

[–] [email protected] 1 points 1 year ago (1 children)

are you running it from a tty on login

Yea, directly on tty.

I imagine these are two separate issues.

I'd think they are related since mpv is working fine on Xwayland but not when I launch alacritty instead

Can you dump your installed packages with pacman -Qe and post it here? I’ll compare it to mine.

alacritty 0.12.2-1
ani-cli 4.6-1
archlinuxarm-keyring 20140119-2
base 3-1
base-devel 1-1
bat 0.23.0-3
cage 0.1.5-1
dhcpcd 10.0.2-1
dialog 1:1.3_20230209-1
linux-rpi 6.1.54-1
lobster 4.0.0-1
man-db 2.11.2-1
neovim 0.9.1-1
net-tools 2.10-2
netctl 1.28-2
noto-fonts 1:23.9.1-1
opendoas 6.8.2-1
openssh 9.4p1-4
pacman-contrib 1.9.1-1
raspberrypi-bootloader 20230921-1
raspberrypi-firmware 20230921-1
ripgrep 13.0.0-3
socat 1.7.4.4-1
tmux 3.3_a-7
vi 1:070224-6
which 2.21-6
wireless-regdb 2023.09.01-1
wireless_tools 30.pre9-3
wpa_supplicant 2:2.10-8
xorg-xwayland 23.2.1-1
[–] [email protected] 1 points 1 year ago

Seems like a pretty minimal config. I can respect that. Have you tried running with a display manager? E.g. sddm. They will often start with additional options you wouldn't have starting from tty.

If sddm does work, you can cat /etc/sddm.conf I believe to see the options it uses and use those when you start from tty

For the audio, try installing pipewire-pulse

Finally, arch for arm isn't officially supported. Your issues could stem from that. You might consider playing around in a VM with both versions to see if you can reproduce your problem.