Interesting. So this might be undithered quantization noise? But it sounds
way to loud for that. At least for 16bit-PCM.
2014-02-05 Raine M. Ekman <[email protected]>:
>
> My theory on what's going on...
>
> I think ALSA is integer and JACK is float, and the final output to
> your sound device is integer again, so you get conversions something
> like:
> float->int (LMMS)
> int->float (JACK)
> float->int (JACK)
>
> If LMMS outputs floats straight to JACK, you get 2 conversions less...
> and the fact that rendering also adds distortion would hint at the bug
> being in the float->int code in LMMS.
>
> Quoting Tobiasz Karon <[email protected]>:
>
> > I don't really know how the bride works and if it's just a config hack
> > (making ALSA output to a virtual JACK device), or some program passing
> data
> > through...
> >
> >
> > 2014-02-05 Jonathan Aquilina <[email protected]>:
> >
> >> I am no expert I have a hunch it potentially has somethign to do wiht
> the
> >> bridge, but I would say more investigation is warrented.
> >>
> >> Is the bridge versions and if so do jack have a newer version we should
> try
> >> and use?
> >>
> >> On Wednesday, February 05, 2014 03:09:50 PM Tobiasz Karo? wrote:
> >> > I did - I switched to JACK back-end, and the distortion disappeared.
> >> >
> >> > 2014-02-05 Jonathan Aquilina <[email protected]>:
> >> > > You tried to bypass the alsa jack bridge all together?
> >> > >
> >> > > On Wednesday, February 05, 2014 03:05:29 PM you wrote:
> >> > > > It sounds to me like some bad interpolation. Maybe ALSA?JACK does
> >> > >
> >> > > something?
> >> > >
> >> > > > However why rendering is affected?
> >> > > >
> >> > > > Btw: I captured the live output with jack_capture.
> >> > > >
> >> > > > 2014-02-05 Jonathan Aquilina <[email protected]>:
> >> > > > > Could this potentially have something to do with the latency of
> >> alsa
> >> > > > > or
> >> > > > > pulse
> >> > > > > compared to jack?
> >> > > > >
> >> > > > > On Wednesday, February 05, 2014 03:00:17 PM Tobiasz Karo? wrote:
> >> > > > > > What's strange - the distortion is also present in rendered
> WAV
> >> > > > > > file,
> >> > > > > > however it sounds different.
> >> > > > > > When using JACK back-end rendered file has no distortion
> either
> >> with
> >> > > > > > Fastest or Best interpolation method (they produce identical
> >> > > > > > output).
> >> > > > > >
> >> > > > > > 2014-02-05 Tobiasz Karo? <[email protected]>:
> >> > > > > > > Using this sample I've just spotted some distortion in the
> >> output.
> >> > > > > > > I've
> >> > > > > > > calculated the difference with the original sample - it's
> >> included
> >> > >
> >> > > as
> >> > >
> >> > > > > > > *distortion.flac*.
> >> > > > > > >
> >> > > > > > > I've made a few tests and I see that it happens with ALSA
> >> output
> >> > > > >
> >> > > > > (bridged
> >> > > > >
> >> > > > > > > back to JACK) - JACK output doesn't distort the output.
> >> > > > > > > I wonder if this is caused by LMMS or ALSA, or JACK-ALSA
> >> bridge?
> >> > > > > > >
> >> > > > > > >
> >> > > > > > > 2014-02-05 Tobiasz Karo? <[email protected]>:
> >> > > > > > >
> >> > > > > > > I've cut it down to 14kB :D
> >> > > > > > >
> >> > > > > > >> Less silence in the beginning and end, will sync better.
> >> > > > > > >>
> >> > > > > > >>
> >> > > > > > >> 2014-02-05 Tobiasz Karo? <[email protected]>:
> >> > > > > > >>
> >> > > > > > >> How about including this one with LMMS?
> >> > > > > > >>
> >> > > > > > >>> --
> >> > > > > > >>> Tobiasz *unfa*
> >> > > > > > >>>
> >> > > > > > >>> -----BEGIN GEEK CODE BLOCK-----
> >> > > > > > >>> Version: 3.1
> >> > > > > > >>> GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P?
> >> L+++>++++$
> >> > >
> >> > > E?
> >> > >
> >> > > > > > >>> W++>$ !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+?
> >> !t(+)
> >> > >
> >> > > 5?
> >> > >
> >> > > > > > >>> !X
> >> > > > > > >>> !R+
> >> > > > > > >>> tv b+>+++ DI>+ D+ G e h-->- !r y--()
> >> > > > > > >>> ------END GEEK CODE BLOCK------
> >> > > > > > >>
> >> > > > > > >> --
> >> > > > > > >> Tobiasz *unfa*
> >> > > > > > >>
> >> > > > > > >> -----BEGIN GEEK CODE BLOCK-----
> >> > > > > > >> Version: 3.1
> >> > > > > > >> GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P?
> >> L+++>++++$
> >> > >
> >> > > E?
> >> > >
> >> > > > > W++>$
> >> > > > >
> >> > > > > > >> !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+)
> 5?
> >> !X
> >> > >
> >> > > !R+
> >> > >
> >> > > > > > >> tv
> >> > > > > > >> b+>+++ DI>+ D+ G e h-->- !r y--()
> >> > > > > > >> ------END GEEK CODE BLOCK------
> >> > > > > > >
> >> > > > > > > --
> >> > > > > > > Tobiasz *unfa*
> >> > > > > > >
> >> > > > > > > -----BEGIN GEEK CODE BLOCK-----
> >> > > > > > > Version: 3.1
> >> > > > > > > GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P?
> >> L+++>++++$
> >> > > > > > > E?
> >> > > > >
> >> > > > > W++>$
> >> > > > >
> >> > > > > > > !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+)
> 5? !X
> >> > >
> >> > > !R+ tv
> >> > >
> >> > > > > > > b+>+++ DI>+ D+ G e h-->- !r y--()
> >> > > > > > > ------END GEEK CODE BLOCK------
> >>
> >>
> >
> >
> > --
> > Tobiasz *unfa*
> >
> > -----BEGIN GEEK CODE BLOCK-----
> > Version: 3.1
> > GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P? L+++>++++$ E? W++>$
> > !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+) 5? !X !R+ tv
> > b+>+++ DI>+ D+ G e h-->- !r y--()
> > ------END GEEK CODE BLOCK------
> >
>
>
>
> --
> [email protected]
> 04 00 83 83 95
>
>
>
>
> ------------------------------------------------------------------------------
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> Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
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>
--
Tobiasz *unfa*
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P? L+++>++++$ E? W++>$
!N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+) 5? !X !R+ tv
b+>+++ DI>+ D+ G e h-->- !r y--()
------END GEEK CODE BLOCK------
------------------------------------------------------------------------------
Managing the Performance of Cloud-Based Applications
Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
Read the Whitepaper.
http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk
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