No audio output on 3.5mm headphone jack from QLC+ on Pi 4

markzvo · Wed Sep 08, 2021 10:23 pm

I cannot get QLC+ to output audio on the Pi 4 to the 3.5mm headphone jack as I have with previous versions. Sound will output to an HDMI monitor OK.

I have used raspi-config to set the default audio out to the headphone jack and set the volume with alsamixer.

However still no sound from QLC+ to the 3.5mm headphone jack... I have used the web interface to set the audio device to "Default device", "default", and tried every option - none of them will work.

If I play the file using aplay (aplay /home/pi/wavsound.wav) from the command line after exiting QLC+, the sound file plays correctly through the 3.5mm output as intended so I believe the issue is with QLC+.

(I have used a Creative Soundblaster Play3 USB audio adapter and this works with QLC+)

markzvo · Sat Jan 29, 2022 8:38 pm

Just wondering if anyone has seen a solution to this issue

markzvo · Tue Nov 15, 2022 2:57 am

Perhaps this is due to the Qt libraries in use for QLC+ having an incompatibility with the Pi 4?

illuminati235 · Fri Jan 06, 2023 11:43 am

Hey, I'm having the same exact issue.

aplay works fine, but no audio on QLC+ with any of the output configurations.

Is there any solution?? Please help!

mcallegari · Fri Jan 06, 2023 5:42 pm

I haven't checked this issue myself, but a quick google search spotted this:
https://forums.raspberrypi.com/viewtopic.php?t=263942
Perhaps this do the trick?

Code: Select all

1) raspi-config
2) -> Advanced Options -> AA pi 4 video Output -> disable 4kp60
3) save
4) reboot

or

Code: Select all

`raspi-config` -> `Advanced Options` -> `A4 Audio Force audio out through HDMI or 3.5mm jack`. Select `1 Headphones`

illuminati235 · Mon Jan 09, 2023 8:05 am

Hi Massimo,

thanks for your answer, but this doesn't solve the problem. I've already set the right output device there.

I think the problem is within QLC+, bc sound output from the command line (aplay) works fine...

kind regards

markzvo · Tue Jan 10, 2023 9:51 pm

illuminati235 wrote: ↑Mon Jan 09, 2023 8:05 am I think the problem is within QLC+

I think it is a problem with Qt from what I have read. I have done a lot of google searches on this too. As stated the OS outputs from 3.5mm jack perfectly as expected.

mcallegari · Wed Jan 11, 2023 8:41 am

Qt uses gstreamer on Linux
Perhaps this is a gstreamer issue rather than Qt's.
I would test a gstreamer playback from command line first (using audio sinks)

mcallegari · Sat May 20, 2023 2:48 pm

Update: I just checked and figured out how to output audio on the 3.5mm jack connector (no issue on QLC+ btw)
I have updated the official RPi user guide PDF with an additional FAQ

markzvo · Wed Aug 02, 2023 2:39 am

Excellent - is this just for 4.12.7? Or will it work on 4.12.6? I cannot update to 4.12.7 until November

mcallegari · Wed Aug 02, 2023 7:08 am

I think it can be applied to the previous image as well.
Just check the additional FAQ note in the PDF manual of the reserved area.

markzvo · Thu Sep 28, 2023 2:32 pm

mcallegari wrote: ↑Wed Aug 02, 2023 7:08 am I think it can be applied to the previous image as well.
Just check the additional FAQ note in the PDF manual of the reserved area.

I can confirm this works on previous versions - I am just surprised with myself because I thought I tried everything!

BUT NOW with Raspberry Pi 5, there is no 3.5mm audio output! So I will have to go back to using my Creative Labs Sound Blaster Play! 3 External USB Sound Adapter - which does work very well with QLC+ so it will be OK