im getting really bad audio popping recording with obs studio on freebsd 14 on wayland
the issue happens when recording the display and the mic at the same time, using either pulse audio,
sndio audio or recording the audio with sox and the video with obs
i have had a simmilar issue on my old macbook air with 4 gig of ram which didnt have enough memory
to record the screen and mic at the same time
im using a dell xps with 16 gig of ram and nvidia gpu and using nvenc encoding which only use 4% of the cpu
so it not an issue with the machine not having enough memory
heres an example of the audio popping in a video
emacs org mode video link handler to open videos with mpv
freebsd set up
freebsd version: freebsd 14 p4
computer: dell xps 15 2019 with an nvidia gpu with 16 gig of ram
desktop enviornment: wayfire wlroots wayland compositor
login_conf
my user is in the video group
set :memorylocked=unlimited: in ~/.login_conf
run cap_mkdb ~/.login_conf
i have also tried setting :memorylocked=unlimited: in the default /etc/login_conf
changed from the default
to
run cap_mkdb on /etc/login_conf
the audio popping happens even with memorylocked=unlimited set
i have nvenc encoding set up and obs only uses about 4% cpu when recording
obs studio has two ways to capture the screen on wlroots wayland compisitors
dmabuf and scpy and both have the same issue with audio pops when recording the mic,
either using pulse audio or sndio to record the mic
both wayfire and hikari wayland wlroots compisitors have the audio popping issue
so its not the desktop
i have also tried all the different video codecs and settings in obs studio and thats not the problem
i get the audio popping when recording the mic with sox and the video with obs
recording permutations
1 - recording the screen with dmabuf or scpy and the audio with pulse or sndio results in audio pops
2 - recording the screen with obs using dmabuf or scpy and the audio with sox results in audio pops
3 - recording the mic with obs studio and not the screen doesnt create any audio pops
4 - recording the mic with sox and not recording the screen with obs doesnt create any audio pops
the issue only occurs when recording both the screen and the mic with either sndio or pulse audio
this leads me to think based on previous experience with obs studio that its some type of memory or audio buffer issue
i have used obs studio on this machine using ubuntu, nixos and fedora without any audio issues
possible solutions
some thoughts on possible solutions to the audio popping issue with obs studio
1 - its a memory limit issue
i have tried setting :memorylocked=unlimited: for me in ~/.login_conf
and default in /etc/login_conf
i note that in /etc/groups sndio is listed
i thought the default group in /etc/login_conf would apply to the audio
but do i need to another entry in the system login_conf for _sndio audio and set memorylocked=unlimited:
2 - its an audio buffer size issue
is there an audio buffer size that need to have its size increased
3 - i need to build a custom kernel
i need to build a custom kernel and enable realtime audio or reduce the latency somehow
if anyone has an idea what the issue might be and could point me in the right direction that would be great
when i google for "freebsd obs" i just get my forum posts and youtube videos in the results
so im not having much luck finding any pointers online
the audio popping is so bad the only work around would be to be to record the audio and video serperatly
and then join them with ffmpeg which is a bit of a pain
sysctl output
sysctl output for dev.pcm
sysctl output for hw.snd
freebsd dotfiles
freebsd root dotfiles
github.com
freebsd dotfiles
github.com
looking at sysctl hw.snd
from the snd man page
i see mentions of a mentions of audio buffer underruns if the latency is set to low
so maybe i need to set increase the latency level
tried increasing the latency to 4 and then 10 but still get audio pops
the issue happens when recording the display and the mic at the same time, using either pulse audio,
sndio audio or recording the audio with sox and the video with obs
i have had a simmilar issue on my old macbook air with 4 gig of ram which didnt have enough memory
to record the screen and mic at the same time
im using a dell xps with 16 gig of ram and nvidia gpu and using nvenc encoding which only use 4% of the cpu
so it not an issue with the machine not having enough memory
heres an example of the audio popping in a video
emacs org mode video link handler to open videos with mpv
freebsd set up
freebsd version: freebsd 14 p4
computer: dell xps 15 2019 with an nvidia gpu with 16 gig of ram
desktop enviornment: wayfire wlroots wayland compositor
login_conf
my user is in the video group
set :memorylocked=unlimited: in ~/.login_conf
Code:
me:\
:charset=UTF-8:\
:lang=en_GB.UTF-8:\
:setenv=LC_COLLATE=C:\
:memorylocked=unlimited:run cap_mkdb ~/.login_conf
Code:
cap_mkdb ~/.login_confi have also tried setting :memorylocked=unlimited: in the default /etc/login_conf
changed from the default
Code:
default:\
:memorylocked=64K:\to
Code:
default:\
:memorylocked=unlimited:\run cap_mkdb on /etc/login_conf
Code:
sudo cap_mkdb /etc/login_confthe audio popping happens even with memorylocked=unlimited set
i have nvenc encoding set up and obs only uses about 4% cpu when recording
obs studio has two ways to capture the screen on wlroots wayland compisitors
dmabuf and scpy and both have the same issue with audio pops when recording the mic,
either using pulse audio or sndio to record the mic
both wayfire and hikari wayland wlroots compisitors have the audio popping issue
so its not the desktop
i have also tried all the different video codecs and settings in obs studio and thats not the problem
i get the audio popping when recording the mic with sox and the video with obs
recording permutations
1 - recording the screen with dmabuf or scpy and the audio with pulse or sndio results in audio pops
2 - recording the screen with obs using dmabuf or scpy and the audio with sox results in audio pops
3 - recording the mic with obs studio and not the screen doesnt create any audio pops
4 - recording the mic with sox and not recording the screen with obs doesnt create any audio pops
the issue only occurs when recording both the screen and the mic with either sndio or pulse audio
this leads me to think based on previous experience with obs studio that its some type of memory or audio buffer issue
i have used obs studio on this machine using ubuntu, nixos and fedora without any audio issues
possible solutions
some thoughts on possible solutions to the audio popping issue with obs studio
1 - its a memory limit issue
i have tried setting :memorylocked=unlimited: for me in ~/.login_conf
and default in /etc/login_conf
i note that in /etc/groups sndio is listed
Code:
_sndio:*:702:i thought the default group in /etc/login_conf would apply to the audio
but do i need to another entry in the system login_conf for _sndio audio and set memorylocked=unlimited:
Code:
_sndio:\
:memorylocked=unlimited:2 - its an audio buffer size issue
is there an audio buffer size that need to have its size increased
3 - i need to build a custom kernel
i need to build a custom kernel and enable realtime audio or reduce the latency somehow
if anyone has an idea what the issue might be and could point me in the right direction that would be great
when i google for "freebsd obs" i just get my forum posts and youtube videos in the results
so im not having much luck finding any pointers online
the audio popping is so bad the only work around would be to be to record the audio and video serperatly
and then join them with ffmpeg which is a bit of a pain
sysctl output
Code:
sysctl dev.pcmsysctl output for dev.pcm
Code:
dev.pcm.3.feedback_rate: 0
dev.pcm.3.mixer.mute_1.desc:
dev.pcm.3.mixer.mute_1.max: 1
dev.pcm.3.mixer.mute_1.min: 0
dev.pcm.3.mixer.mute_1.val: 0
dev.pcm.3.mixer.vol_0_1.desc:
dev.pcm.3.mixer.vol_0_1.max: 3584
dev.pcm.3.mixer.vol_0_1.min: -2048
dev.pcm.3.mixer.vol_0_1.val: -640
dev.pcm.3.mixer.vol_0_0.desc:
dev.pcm.3.mixer.vol_0_0.max: 3584
dev.pcm.3.mixer.vol_0_0.min: -2048
dev.pcm.3.mixer.vol_0_0.val: -640
dev.pcm.3.mode: 5
dev.pcm.3.bitperfect: 0
dev.pcm.3.buffersize: 0
dev.pcm.3.rec.vchanformat: s16le:2.0
dev.pcm.3.rec.vchanrate: 48000
dev.pcm.3.rec.vchanmode: fixed
dev.pcm.3.rec.vchans: 1
dev.pcm.3.hwvol_mixer: vol
dev.pcm.3.hwvol_step: 5
dev.pcm.3.%parent: uaudio0
dev.pcm.3.%pnpinfo:
dev.pcm.3.%location:
dev.pcm.3.%driver: pcm
dev.pcm.3.%desc: USB audio
dev.pcm.2.mode: 3
dev.pcm.2.bitperfect: 0
dev.pcm.2.buffersize: 65536
dev.pcm.2.play.vchanformat: s16le:2.0
dev.pcm.2.play.vchanrate: 48000
dev.pcm.2.play.vchanmode: passthrough
dev.pcm.2.play.vchans: 1
dev.pcm.2.play.32bit: 24
dev.pcm.2.%parent: hdaa1
dev.pcm.2.%pnpinfo:
dev.pcm.2.%location: nid=3
dev.pcm.2.%driver: pcm
dev.pcm.2.%desc: Intel Kaby Lake (HDMI/DP 8ch)
dev.pcm.1.mode: 3
dev.pcm.1.bitperfect: 0
dev.pcm.1.buffersize: 65536
dev.pcm.1.play.vchanformat: s16le:2.0
dev.pcm.1.play.vchanrate: 48000
dev.pcm.1.play.vchanmode: fixed
dev.pcm.1.play.vchans: 2
dev.pcm.1.play.32bit: 24
dev.pcm.1.%parent: hdaa0
dev.pcm.1.%pnpinfo:
dev.pcm.1.%location: nid=33
dev.pcm.1.%driver: pcm
dev.pcm.1.%desc: Realtek ALC298 (Left Analog Headphones)
dev.pcm.0.mode: 7
dev.pcm.0.bitperfect: 0
dev.pcm.0.buffersize: 65536
dev.pcm.0.rec.vchanformat: s16le:2.0
dev.pcm.0.rec.vchanrate: 48000
dev.pcm.0.rec.vchanmode: fixed
dev.pcm.0.rec.vchans: 1
dev.pcm.0.rec.autosrc: 2
dev.pcm.0.rec.32bit: 24
dev.pcm.0.play.vchanformat: s16le:2.0
dev.pcm.0.play.vchanrate: 48000
dev.pcm.0.play.vchanmode: fixed
dev.pcm.0.play.vchans: 1
dev.pcm.0.play.32bit: 24
dev.pcm.0.%parent: hdaa0
dev.pcm.0.%pnpinfo:
dev.pcm.0.%location: nid=23,18
dev.pcm.0.%driver: pcm
dev.pcm.0.%desc: Realtek ALC298 (Internal Analog)
dev.pcm.%parent:sysctl output for hw.snd
Code:
sysctl hw.snd
Code:
hw.snd.maxautovchans: 16
hw.snd.default_unit: 1
hw.snd.version: 2009061500/amd64
hw.snd.default_auto: 1
hw.snd.verbose: 0
hw.snd.vpc_mixer_bypass: 1
hw.snd.feeder_rate_quality: 1
hw.snd.feeder_rate_round: 25
hw.snd.feeder_rate_max: 2016000
hw.snd.feeder_rate_min: 1
hw.snd.feeder_rate_polyphase_max: 183040
hw.snd.feeder_rate_presets: 100:8:0.85 100:36:0.92 100:164:0.97
hw.snd.feeder_eq_exact_rate: 0
hw.snd.feeder_eq_presets: PEQ:16000,0.2500,62,0.2500:-9,9,1.0:44100,48000,88200,96000,176400,192000
hw.snd.basename_clone: 1
hw.snd.compat_linux_mmap: 0
hw.snd.syncdelay: -1
hw.snd.usefrags: 0
hw.snd.vpc_reset: 0
hw.snd.vpc_0db: 45
hw.snd.vpc_autoreset: 0
hw.snd.timeout: 5
hw.snd.latency_profile: 1
hw.snd.latency: 2
hw.snd.report_soft_matrix: 1
hw.snd.report_soft_formats: 1freebsd dotfiles
freebsd root dotfiles
GitHub - NapoleonWils0n/freebsd-root-xps: freebsd root dotfiles for dell xps 15 2019
freebsd root dotfiles for dell xps 15 2019. Contribute to NapoleonWils0n/freebsd-root-xps development by creating an account on GitHub.
github.com
freebsd dotfiles
GitHub - NapoleonWils0n/freebsd-dotfiles-xps: freebsd dotfiles dell xps 15 2019
freebsd dotfiles dell xps 15 2019. Contribute to NapoleonWils0n/freebsd-dotfiles-xps development by creating an account on GitHub.
github.com
looking at sysctl hw.snd
Code:
hw.snd.latency_profile: 1
hw.snd.latency: 2from the snd man page
Code:
hw.snd.latency
Configure the buffering latency. Only affects applications
that do not explicitly request blocksize / fragments. This
tunable provides finer granularity than the
hw.snd.latency_profile tunable. Possible values range between
0 (lowest latency) and 10 (highest latency).
hw.snd.latency_profile
Define sets of buffering latency conversion tables for the
hw.snd.latency tunable. A value of 0 will use a low and ag-
gressive latency profile which can result in possible underruns
if the application cannot keep up with a rapid irq rate, espe-
cially during high workload. The default value is 1, which is
considered a moderate/safe latency profile.i see mentions of a mentions of audio buffer underruns if the latency is set to low
so maybe i need to set increase the latency level
tried increasing the latency to 4 and then 10 but still get audio pops
Code:
sudo syscyl hw.snd.latency=10