Random Audio buffering events (XFCE)

codytherudeguy

When using my capture device in obs and displaying it's contents on the second monitor i'm having random buffer events that make the sound buzz and display act weird for like a split second
sound card is conexant cx20632

I've tried setting the latency to 0 and it still does it

nevillehay

https://obsproject.com/forum/threads/buzzing-sound-while-streaming.3814/

There's this. Also there's a noise suppression setting in obs. You can try toggling that

codytherudeguy

nevillehay Decided to run a test to see if it was just OBS and no it's a system level issue
basically the sound glitches and the display freezes up for a split second

vimanuelt

Are you using an older dual-core computer? I ask as I often see issues with cpu or mem or I/O contraints on older computers.

codytherudeguy

vimanuelt you can see a picture of my specs in the general discussion forum and no it's a six core intel cpu
it's something to do with the pipewire setup having buffering events
i'll probably just switch to the mate official version instead

vimanuelt

GhostBSD uses OSS (Open Sound System) and PulseAudio by default. If you choose to replace or heavily customize the audio stack, you may encounter compatibility issues because many applications are compiled to work with the default setup. Experimenting with settings and recompiling software may be necessary.

The safest approach is to decide on a single audio system you want to use and ensure all audio-related software is built or configured to use that system. Keep in mind that unlike some Linux distributions, GhostBSD does not provide automatic audio backend switching, so manual configuration and occasional recompilation are often required. If you are not comfortable with this, it is recommended to stick with the default OSS + PulseAudio configuration.

codytherudeguy

vimanuelt i think i got it
it might have been obs-studio cause in my capture device properties i unchecked use buffering and autoreset on timeout

I will let you know if it creeps up again but so far unchecking those seems to have done it

vimanuelt

Thanks. Good to know.

codytherudeguy

Yeah it's something to do with the way the ghostbsd provided build of obs handles my capture devices audio
what i do is using monitor and output to get it to play the audio through my headphones and something to do with that causes the random buffer events that effect the display as well makes it freeze up for a few seconds

vimanuelt

If your GPU driver on FreeBSD/GhostBSD is:

using a fallback mode (like software rendering)
lacking proper hardware acceleration
or has PCIe power-management issues
then any spike in system latency (like an audio underrun) could momentarily affect the compositor and cause a micro-freeze.

This is less likely, but possible.

You would see signs like:

High CPU usage from the compositor (XFCE, Xorg)
“i915kms” or “amdgpu” errors in dmesg
OBS reporting “High rendering lag” but not “encoding lag”

If none of those are happening → GPU is not the cause.

codytherudeguy

It could be something with this particular mini computer maybe the usb bus or something like that
i have narrowed it down to the way audio interfaces with my usb capture device which is a macrosilicon usb 3.0 and yes the ports are the correct speed
I'm going to say it's either the conexant sound chip itself or a bios setting effecting the usb timeout on my capture device

Basically it's a weird issue that is beyond my abilities to fix
i've tried the buffering fixes and all that it does it on both mate and xfce regardless of what i do
i'll dig deeper into it when i'm less busy (it's probably going to require a lot of trial and error to fix)
if you want to see my pc specs it's in general discussion

codytherudeguy

Yep it's a capture device problem
motion jpeg don't work and using the emulated modes is part of whats causing it to do the buffer event
terminal error output of the motion jpeg error
[mjpeg @ 0x1fbeebe18000] mjpeg_decode_dc: bad vlc: 0:0 (0x1fbef040fa48)
[mjpeg @ 0x1fbeebe18000] error dc
[mjpeg @ 0x1fbeebe18000] error y=0 x=0
error: v4l2-input: /dev/video0: select timed out
error: v4l2-input: /dev/video0: failed to log status
[mjpeg @ 0x1fbeebe18000] error count: 64
[mjpeg @ 0x1fbeebe18000] error y=33 x=6
[mjpeg @ 0x1fbeebe18000] error count: 74
[mjpeg @ 0x1fbeebe18000] error y=0 x=10
[mjpeg @ 0x1fbeebe18000] huffman table decode error
error: v4l2-input: decoder: failed to send frame to codec
error: v4l2-input: failed to unpack jpeg or h264

Capture device dmesg output

ugen0.4: <MACROSILICON USB3.0 HD VIDEO> at usbus0
uaudio0 on uhub0
uaudio0: <MACROSILICON USB3.0 HD VIDEO, class 239/2, rev 2.00/21.00, addr 5> on usbus0
uaudio0: No playback.
uaudio0: Record[0]: 96000 Hz, 1 ch, 16-bit S-LE PCM format, 2x4ms buffer. (selected)
uaudio0: No MIDI sequencer.
pcm3 on uaudio0
uaudio0: No HID volume keys found.
usbhid4 on uhub0
usbhid4: <MACROSILICON USB3.0 HD VIDEO, class 239/2, rev 2.00/21.00, addr 5> on usbus0
hidbus4: <HID bus> on usbhid4