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Comment éviter les rappels XRUN

Après avoir défini QjackCtrl et Arour, je peux enregistrer correctement, mais les sauts de rappel XRUN sont ennuyeux.

Voici ma configuration QjackCtrl:

Dans les journaux, je vois:

18:37:22.041 XRUN callback (97).
18:37:22.793 XRUN callback (42 skipped).
18:37:24.794 XRUN callback (111 skipped).
18:37:26.795 XRUN callback (111 skipped).
18:37:28.796 XRUN callback (111 skipped).
18:37:30.798 XRUN callback (75 skipped).
18:38:45.359 XRUN callback (552).
Mon Oct 20 18:38:45 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Running
Mon Oct 20 18:38:45 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:38:45 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:38:46 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:38:46 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:38:46 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:38:46 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
18:38:46.833 XRUN callback (3 skipped).
Mon Oct 20 18:38:46 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:38:46 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:38:46 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:38:46 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Triggered
Mon Oct 20 18:38:46 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
18:38:48.834 XRUN callback (23 skipped).
18:40:28.031 XRUN callback (580).
Mon Oct 20 18:40:28 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Running
Mon Oct 20 18:40:28 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
18:40:28.884 XRUN callback (1 skipped).
Mon Oct 20 18:40:28 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:40:28 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Running
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Triggered
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Triggered
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client PulseAudio JACK Source finished after current callback
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Running
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Running
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = PulseAudio JACK Source was not finished, state = Triggered
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Mon Oct 20 18:40:29 2014: ERROR: JackEngine::XRun: client = ardour was not finished, state = Triggered
Mon Oct 20 18:40:29 2014: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
18:40:30.885 XRUN callback (32 skipped).
18:40:32.887 XRUN callback (89 skipped).

Quels sont les sauts de rappel XRUN? Comment puis-je résoudre ces problèmes?

Exécuter Ubuntu 14.04 avec un noyau à faible latence:

$ uname -a
Linux laptop 3.13.0-38-lowlatency #65-Ubuntu SMP PREEMPT Thu Oct 9 12:04:28 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
14.04jackardouraudio-recording
2
Ionică Bizău

Bumped into this again et enfin avoir la bonne réponse à la raison pour laquelle xruns se produisent.

De la page JACKS:

Spécifiez le nombre d'images entre les appels de processus JACK (). [b] Cette valeur doit être une puissance de 2 [/ b] et la valeur par défaut est 1024. Si vous avez besoin d'une latence faible, définissez -p aussi bas que possible sans voir xruns. UNE
une période plus longue génère une latence plus élevée, mais rend moins probable xruns. La latence de capture de JACK en secondes est --period divisée par --rate

Vous devez régler correctement sample rate, frames/period et periods/buffer. La liste ci-dessous est optimale pour les périphériques USB .

(Frames [or buffer] / Sample Rate ) * Periods = Latency in ms

( 16 / 48000 ) * 3 = 1
( 32 / 48000 ) * 3 = 2
( 64 / 48000 ) * 3 = 4
( 128 / 48000 ) * 3 = 8
( 256 / 48000 ) * 3 = 16
( 512 / 48000 ) * 3 = 32
( 1024 / 48000 ) * 3 = 64
( 2048 / 48000 ) * 3 = 128
( 32 / 96000 ) * 3 = 1
( 64 / 96000 ) * 3 = 2
( 128 / 96000 ) * 3 = 4
( 256 / 96000 ) * 3 = 8
( 512 / 96000 ) * 3 = 16
( 1024 / 96000 ) * 3 = 32
( 2048 / 96000 ) * 3 = 64
( 64 / 192000 ) * 3 = 1
( 128 / 192000 ) * 3 = 2
( 256 / 192000 ) * 3 = 4
( 512 / 192000 ) * 3 = 8
( 1024 / 192000 ) * 3 = 16
( 2048 / 192000 ) * 3 = 32

J'ai pris le plus optimal, tous sont ici: http://wiki.linuxaudio.org/wiki/list_of_jack_frame_period_settings_ideal_for_usb_interface

4
Karl Morrison