Re: [pulseaudio-discuss] Virtual audio cable - high cpu usage
чт, 4 февр. 2021 г. в 03:10, Renaud GHIA : > 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! > The reason is that you are using module-loopback. Due to a potential difference between the clocks on the null sink and on the real sound card (even though both report 44100 Hz), it always has to resample in order to correct for the clock skew. If you don't understand, here is an analogy: you have two mechanical watches. Even though both claim that their hour hand makes one full circle every 12 hours, in fact, if left unattended, they will diverge over time. There is no way to avoid that, except by moving to Jack or PipeWire which simply don't introduce a null sink with an independent clock. If you decide to stay on PulseAudio, you can tweak the resampling method. The default, speex-float-1, is light on the CPU resources and should produce no distortions detectable by human ear on typical speech and music. It does produce easily detectable distortions on specifically crafted signals. If you want to make sure that the resampler is transparent no matter what is thrown at it, use speex-float-5. There is no point in going higher than that. -- Alexander E. Patrakov CV: http://u.pc.cd/wT8otalK ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] Virtual audio cable - high cpu usage
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: flags: state: RUNNING source: 8 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 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 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: > > flags: > > state: RUNNING > > source: 2 > > 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 > > ___ > pulseaudio-discuss mailing list > pulseaudio-discuss@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss > ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] USB-connected headsets: no sound
On Wed, 3 Feb 2021, Sean Greenslade wrote: The menu I was referring to is attached to each of the clients. In your screenshot, it's the box that says "HD-Audio Generic Analog Stereo". Click that and change it to "Logitech H570e Stereo Analog Stereo". Sean, Thanks for correcting me. When I change the upper port it displays "Headset (unplugged)" while the headset is plugged in. The lower port sill shows "Logitach H5703 Stereo Analog Stereo" with the port remaining "Headphones". Your system theme makes it a little hard to tell, but yes, the one that is in the darkened state is the selected one. As I mentioned, this won't directly affect existing streams, it simply sets the "fallback" device that is selected if a new client appears and doesn't explicitly specify which sound card it wants to send audio to. Unfortuately, changing the upper port to read "Headset (unplugged)" did not make a difference; still no audio output. Regards, Rich ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] Virtual audio cable - high cpu usage
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: > flags: > state: RUNNING > source: 2 > 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 ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] USB-connected headsets: no sound
On Wed, Feb 03, 2021 at 07:25:31AM -0800, Rich Shepard wrote: > On Tue, 2 Feb 2021, Sean Greenslade wrote: > > > By default, new sound devices don't take over existing streams. In > > pavucontrol under the playback tab, there should be a dropdown menu for > > each client listing which card it is currently sending audio to. Try > > starting a sound playback and switching its dropdown to the USB device. > > Sean, > > Thanks for the quick response. > > I started a .mp3 using Audacious and pavucontrol's Playback tab shows > Applications (see attached screenshot.) The menu I was referring to is attached to each of the clients. In your screenshot, it's the box that says "HD-Audio Generic Analog Stereo". Click that and change it to "Logitech H570e Stereo Analog Stereo". > > Under the "output devices" tab, there is a checkmark button next to the > > sound devices. This lets you specify which device is the default. It won't > > force existing streams over to it, however, and it won't prevent some > > clients from remembering their previous soundcard, so you may still need > > to manually move some clients over to the new soundcard. > > There are two devices shown, including the headphones. The checkmark box has > 2 states represented by light grey and lighter grey (see attached > screenshot). Both tooltips say the active checkmark is to 'Set for > fallback.' By trial-and-error I think the darker grey is the active state > (it is for the mute button.) Regardless, no sound is heard with any > combination of checkmark button states for the two output devices. Your system theme makes it a little hard to tell, but yes, the one that is in the darkened state is the selected one. As I mentioned, this won't directly affect existing streams, it simply sets the "fallback" device that is selected if a new client appears and doesn't explicitly specify which sound card it wants to send audio to. --Sean ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] USB-connected headsets: no sound
On Tue, 2 Feb 2021, Sean Greenslade wrote: By default, new sound devices don't take over existing streams. In pavucontrol under the playback tab, there should be a dropdown menu for each client listing which card it is currently sending audio to. Try starting a sound playback and switching its dropdown to the USB device. Sean, Thanks for the quick response. I started a .mp3 using Audacious and pavucontrol's Playback tab shows Applications (see attached screenshot.) Under the "output devices" tab, there is a checkmark button next to the sound devices. This lets you specify which device is the default. It won't force existing streams over to it, however, and it won't prevent some clients from remembering their previous soundcard, so you may still need to manually move some clients over to the new soundcard. There are two devices shown, including the headphones. The checkmark box has 2 states represented by light grey and lighter grey (see attached screenshot). Both tooltips say the active checkmark is to 'Set for fallback.' By trial-and-error I think the darker grey is the active state (it is for the mute button.) Regardless, no sound is heard with any combination of checkmark button states for the two output devices. If you have more ideas please share them with me and I'll report the results. Stay well, Rich ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
