Thank you for the tip.
Now I am sure that resampling does not apply (see below).
But unfortunately pulseaudio always consumes 30% of one CPU core!
Renaud
driver: <protocol-native.c>
flags:
state: RUNNING
source: 8 <VACmic>
volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
muted: no
current latency: 0.50 ms
requested latency: 2000.00 ms
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
resample method: (null)
owner module: 6
client: 29 <Lavf58.20.100>
properties:
media.name = "record"
application.name = "Lavf58.20.100"
native-protocol.peer = "UNIX socket client"
native-protocol.version = "32"
application.process.id = "18295"
application.process.user = "vagrant"
application.process.host = "debian10.localdomain"
application.process.binary = "ffmpeg"
application.language = "C"
window.x11.display = ":0"
application.process.machine_id = "c79df160d01f4c7780e6da0aaf5515c3"
application.process.session_id = "8"
module-stream-restore.id = "source-output-by-application-name:Lavf58.20.100"
flags:
state: RUNNING
source: 8 <VACmic>
volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
muted: no
current latency: 0.50 ms
requested latency: 2000.00 ms
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
resample method: (null)
owner module: 6
client: 29 <Lavf58.20.100>
properties:
media.name = "record"
application.name = "Lavf58.20.100"
native-protocol.peer = "UNIX socket client"
native-protocol.version = "32"
application.process.id = "18295"
application.process.user = "vagrant"
application.process.host = "debian10.localdomain"
application.process.binary = "ffmpeg"
application.language = "C"
window.x11.display = ":0"
application.process.machine_id = "c79df160d01f4c7780e6da0aaf5515c3"
application.process.session_id = "8"
module-stream-restore.id = "source-output-by-application-name:Lavf58.20.100"
Le mer. 3 févr. 2021 à 21:04, Sean Greenslade <sean@xxxxxxxxxxxxxxxxxx> a écrit :
On Tue, Feb 02, 2021 at 10:40:51AM +0100, Renaud GHIA wrote:
> Hi,
>
> Below the result of the command "pacmd list".
> Here without any change of resampling method.
This part here shows your ffmpeg client:
> index: 1
> driver: <protocol-native.c>
> flags:
> state: RUNNING
> source: 2 <VACmic>
> volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% /
> 0.00 dB
> balance 0.00
> muted: no
> current latency: 0.50 ms
> requested latency: 2000.00 ms
> sample spec: s16le 2ch 48000Hz
> channel map: front-left,front-right
> Stereo
> resample method: speex-float-1
It seems like ffmpeg is requesting 48 kHz audio, so pulse is forced to
resample. If possible, can you try running your ffmpeg process with the
flag "-sample_rate 44100" and see if that reduces the CPU usage?
Everything else in your pulse chain is 44.1 kHz, so with that change
there should be no resampling at all.
--Sean
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