[APP] DDCCTL - Control HDMI Display Audio Volume

[asheenlevrai]

1) (demo version is free forever and apparently does the job):

SoundSiphon turned out to be super buggy in my case. Worse than SoundFlower

 

[asheenlevrai]

I will give these free solutions a try

1) (demo version is free forever and apparently does the job):
SounSiphon

2) (controls via app or keyboard shortcuts, not via dedicated apple keyboard keys: F10-F12)
https://www.tonymacx86.com/threads/a-small-utility-to-adjust-hdmi-and-displayport-volume.229156/
fork1 (Bluejamesbond) : https://github.com/bluejamesbond/MonitorControl.OSX
fork2 (Tyilo) : https://github.com/Tyilo/MonitorControl.OSX

3) https://github.com/the0neyouseek/MonitorControl

Another fork that looks very promising:

Control your external monitor brightness, contrast or volume directly from a menulet or with keyboard shortcuts :
...
You can use Karabiner Elements to use the default mac key (F1, F2 for brightness and F10, F11, F12 for volume) with this set of custom rules : Karabiner rules for MonitorControl
...
Bonus: Using keyboard shortcuts display the native osd

 

[ludwigaec]

Hi guys,
I don't the UI of this app so I just created a new version that have the same look and feel of standard Mac volume hud.
On the left DDCCTL view <<<<
>>>>> On the right the macOs volume control

[APP] DDCCTL - Control HDMI Display Audio Volume

DDCCTL 1.0

Volume control for HDMI displays is disabled on OS X. Use this app to control the volume of your HDMI display speakers using the F10, F11 and F12 keyboard keys.

View attachment 122300

Guide

• Download DDCCTL.zip and extract the application to /Applications
• Open "System Preferences > Sound" and choose the HDMI input
• Open "System Preferences > Users & Groups > Login items" and add DDCTL.app
• Open "System Preferences > Keyboard > Keyboard" and select "Use all F1, F2, etc. keys as standard function keys"
• Open "System Preferences > Keyboard > Shortcuts" and change change any shortcut that uses the F10, F11 or F12 key to another key, even if it is unselected (!)

View attachment 122304View attachment 122303

Limitations

• Only works for HDMI displays with "DDC/CI" enabled
• Currently only changes main display audio volume
• Currently shortcuts cannot be changed
• Only tested on OS X 10.10 Yosemite

Downloads

View attachment 122301
View attachment 122302

License: GNU GPLv3
Many thanks and credits to: jontaylor, SJ_UnderWater