Le 09/11/2017 à 12:41, Tanu Kaskinen a écrit :
On Wed, 2017-11-08 at 15:31 +0100, [email protected] wrote:
Le 08/11/2017 à 12:43, Tanu Kaskinen a écrit :
The issues with rewinds were about monitor sources and resampling. If I
understood correctly, your source material is in 48000 Hz and Jack is
configured with that rate too, so there's no need for resampling, and
you haven't mentioned recording from a monitor source either, so there
should be no reason to be concerned about rewinds. If rewinds happen,
they shouldn't cause any glitches.
But if you're curious, the monitor source bug causes short chunks of
audio to be duplicated in the recording stream. I haven't seen concrete
examples of what kind of glitches resamplers can have, but my intuition
is that one sample in the audio stream might have a significant
adjustment towards zero, and a few samples after that might have
slightly wrong values.
I give you my audio chain more precisely:
Playing = Audio file (to simplify) → PulseAudio (→
pulseaudio-module-jack) → Jack → Audacity = Recording
“Audio file” means the audio source is in the computer, it is not taken
by a microphone for example (is this is what you said by “monitor
source”? Or you talk about the tab in pavucontrol “Recording → Audacity
→ Monitor of SOMETHING”?).
I'm talking about that "Monitor of SOMETHING". Audio devices in
pulseaudio are represented by sinks (playback devices) and sources
(capture devices). Each sink has a monitor source associated with it,
and the monitor source can be used to record what is being played to
the sink.
Since you're recording from jack and not from pulseaudio, you're
definitely not using any monitor sources.
Settings like the sample rate/number of channels/… are set to be the
same for my entire audio chain, to avoid possible sound modifications
like resampling. Yes I think it will not be more than 48000 Hz / 2 channels.
As you said, duplicated values (plus you said it is a bug) are related
to rewinds. So no rewinds in the log = no possible duplicated values.
If I understood, in my case, you cannot confirm 0 dB is the only result
I could have in case of problems? (because you think I can have other
problems than underruns?)
Underruns are the only problem that you can have, unless there's
something that I haven't thought of.
Noted!
Thank you very much Tanu for your answers. If you come across other
possible problems which result other than 0 dB (random values for
example) for this[my] case, please, if possible, share them in this
thread before one month.
Before one month because I will unsubscribe from the mailing list one
month after the last reply to this thread, so no more notifications.
Anyway, I will check the changelogs to see if you come across problems
which are related to this[my] case—but I hope there will be none!
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