[SOLVED] Raspberry Pi and sound peaks and/or cuts/drops

Minime_2003 · 08-29-2021, 07:33 AM

I was having some sound issues with my Raspberry Pi 4.
Sound peaking, sometimes cutting/dropping randomly.

Slightly disappointed with my Pi 4, but at the same time confused that it worked when using youtube streams throught firefox, and the sound cut/dropped and peaked diffrently when using kodi-gbm and when running kodi-x11 (xorg).

So i came to the conclution that this could not be a hardware issue (Like a cheap or bad soundcard/chip), it had to be some software issue.

Started to wondering if this was some issue using kodi and having problem with streams.
So i started to google, and after hunting diffrent search words i finaly found a guide at kodi wiki and about PulseAudio.

So i tried changing the settings for PulseAudio as decribed and rebooted the system.
Tadaaa, it worked! =)

/etc/pulse/daemon.conf

Code:

default-sample-format = s24le
default-sample-rate = 44100
alternate-sample-rate = 48000
;new with pulseaudio 11
avoid-resampling = true
resample-method = speex-float-5

So i thought i would share my discovery if some one else is having the same kind of issues with choppy sound, sound peaks and sound that drops out/cuts.

By the way, i have to say that i am very surprised and impressed of this Pi and what it actually can do and handle.
Its an amazing, cheap and good device as a media PC, shame it's not very easy to get CDM working.
But i guess one can't have it all right ;-)

glorsplitz · 08-30-2021, 07:30 PM

Quote:

Originally Posted by Minime_2003

But i guess one can't have it all right ;-)

but you can get close enough.

I like your sticktoitiveness, keep at it!

Minime_2003 · 09-19-2021, 07:23 AM

Looks like i forgot to mention that one also has to add a parameter to "/etc/pulse/default.pa"

Change the line:

Code:

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
.else

to this:

Code:

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect tsched=0
.else

What this workaround does is disabling “timer-based audio scheduling” in PulseAudio.

Tried disabling the changes in "/etc/pulse/daemon.conf"

Code:

;default-sample-format = s24le
;default-sample-rate = 44100
;alternate-sample-rate = 48000
;;new with pulseaudio 11
;avoid-resampling = true
;resample-method = speex-float-5

And rebooted the system, sound was still crackle-free after this.
So it might be that one only has to disable timer-based audio scheduling as described above to resolve this.
However if you still get the crackling sound again at some point, then just try to acrivate the lines in "/etc/pulse/daemon.conf" again.

Best regards:
Minime