1 Mar
2016
1 Mar
'16
1:55 a.m.
Reading the JACK API docs, I noticed freewheel mode, at the bottom here:
http://www.jackaudio.org/files/docs/html/group__ServerControl.html
What are disadvantages?
--
Jonathan E. Brickman jeb(a)ponderworthy.com (785)233-9977
Hear us at http://ponderworthy.com -- CDs and MP3 now available!
<http://ponderworthy.com/ad-astra/ad-astra.html>
Music of compassion; fire, and life!!!
1 Mar
1 Mar
2:59 a.m.
Freewheel mode is a highly specialized thing, intended for offline (i.e.
not throttled by audio data flowing to/from audio hardware) rendering of
the entire JACK graph.
It used by (e.g.) Ardour for exporting (when Ardour is using JACK anyway;
Ardour's other backends have a similar concept built in).
Freewheel mode is not something you use as a general thing.
On Mon, Feb 29, 2016 at 7:55 PM, Jonathan E. Brickman <jeb(a)ponderworthy.com>
wrote:
Reading the JACK API docs, I noticed freewheel mode,
at the bottom here:
http://www.jackaudio.org/files/docs/html/group__ServerControl.html
What are disadvantages?
--
Jonathan E. Brickman jeb(a)ponderworthy.com (785)233-9977
Hear us at http://ponderworthy.com -- CDs and MP3 now available!
<http://ponderworthy.com/ad-astra/ad-astra.html>
Music of compassion; fire, and life!!!
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
2 Mar
2 Mar
12:37 a.m.
On Mon, 29 Feb 2016 20:59:26 -0500
Paul Davis <paul(a)linuxaudiosystems.com> wrote:
It used by (e.g.) Ardour for exporting (when Ardour is
using JACK
anyway; Ardour's other backends have a similar concept built in).
Since I would (still) have to compile jackd from upstream in order to
get the fix related a race condition when exporting with Ardour, can
Ardour be switched from using jackd to ALSA for a session, just the
time to do the export and then switched back ? And in doing so, is
there any drawback in doing the export with ALSA ?
Thanks.
12:57 a.m.
On 03/02/2016 12:37 AM, jonetsu(a)teksavvy.com wrote:
Since I would (still) have to compile jackd from
upstream in order to
get the fix related a race condition when exporting with Ardour
How about using a GNU/Linux distribution that does not ship a 2 1/2 year
old versions of jackd?
Can Ardour be switched from using jackd to ALSA for a
session, just
the time to do the export and then switched back ?
Yes, you can change the audio system any time, also while a session is
loaded. Ardour-Menu > Window > Audio/Midi Setup
And in doing so,
is there any drawback in doing the export with ALSA ?
No drawbacks. Except you'll have to stop jackd if you want to use the
same device as jackd is using.
There's also a "None (Dummy)" audio system which does not need an actual
device, but this only available if Ardour was configured
with
./waf configure --with-backends=jack,alsa,dummy
(Ardour4 debug builds from http://nightly.ardour.org/ have this enabled).
ciao,
robin
2:31 a.m.
On Wed, 2 Mar 2016 00:56:57 +0100
Robin Gareus <robin(a)gareus.org> wrote:
How about using a GNU/Linux distribution that does not
ship a 2 1/2
year old versions of jackd?
No way. I do not want to install a new OS anytime soon. This LM 17
works fine and is supported until 2019 security-wise. (Hopefully no
malware will come through the updates since LM was hacked seriously
recently.)
No drawbacks. Except you'll have to stop jackd if
you want to use the
same device as jackd is using.
There's also a "None (Dummy)" audio
system which does not need an
actual device, but this only available if Ardour was configured
with
./waf configure --with-backends=jack,alsa,dummy
(Ardour4 debug builds from http://nightly.ardour.org/ have this
enabled).
Thanks for the details. Can this dummy option be used for exports and
will it be in the next Ardour release ?
Cheers.
3:32 a.m.
On Tue, Mar 1, 2016 at 8:31 PM, jonetsu(a)teksavvy.com <jonetsu(a)teksavvy.com>
wrote:
As Robin explained, the "dummy" backend is in *debug* builds on the nightly
site. We do not include it in normal releases.
On Wed, 2 Mar 2016 00:56:57 +0100
Robin Gareus <robin(a)gareus.org> wrote:
Except ... it doesn't work fine, because it has a 2-1/2 year old version of
JACK :)
How about using a GNU/Linux distribution that
does not ship a 2 1/2
year old versions of jackd?
No way. I do not want to install a new OS anytime soon. This LM 17
works fine and is supported until 2019 security-wise. (Hopefully no
malware will come through the updates since LM was hacked seriously
recently.)
No drawbacks. Except you'll have to stop
jackd if you want to use the
same device as jackd is using.
There's also a "None (Dummy)" audio
system which does not need an
actual device, but this only available if Ardour was configured
with
./waf configure --with-backends=jack,alsa,dummy
(Ardour4 debug builds from http://nightly.ardour.org/ have this
enabled).
Thanks for the details. Can this dummy option be used for exports and
will it be in the next Ardour release ?
3:32 a.m.
On 03/02/2016 02:31 AM, jonetsu(a)teksavvy.com wrote:
On Wed, 2 Mar 2016 00:56:57 +0100
Robin Gareus <robin(a)gareus.org> wrote:
Well, apparently not, if jackd still has this ancient freewheeling bug.
Who knows what other sleeping dragons are out there.
But you're right, switching distros is a rather drastic measure.
Since Mint is Ubuntu based, http://kxstudio.linuxaudio.org/Repositories
might be able to help out in your case.
How about using a GNU/Linux distribution that
does not ship a 2 1/2
year old versions of jackd?
No way. I do not want to install a new OS anytime soon. This LM 17
works fine and is supported until 2019 security-wise. (Hopefully
no
malware will come through the updates since LM was hacked seriously
recently.)
Yes, it can be used for export. It does implement the same mechanism as
JACK freewheeling.
Its purpose is testing and debugging (and working around odd issue) and
it is not intended to be released with non-debug versions. Sorry, it
won't be part of official release binaries.
Cheers!
robin
PS. to get back on topic,
http://www.jackaudio.org/files/docs/html/group__ServerControl.html#gad65c74…
says "faster than realtime" execution of a JACK graph
it can also be "slower than realtime", e.g live encode the jack-graph to
.ogg and/or mp3 or multiple formats at the same time which can take
considerable CPU.
No drawbacks. Except you'll have to stop
jackd if you want to use the
same device as jackd is using.
There's also a "None (Dummy)" audio
system which does not need an
actual device, but this only available if Ardour was configured
with
./waf configure --with-backends=jack,alsa,dummy
(Ardour4 debug builds from http://nightly.ardour.org/ have this
enabled).
Thanks for the details. Can this dummy option be used for exports and
will it be in the next Ardour release ?
3:38 a.m.
On Tue, 1 Mar 2016 20:31:01 -0500, jonetsu(a)teksavvy.com wrote:
On Wed, 2 Mar 2016 00:56:57 +0100 Robin Gareus
<wrote:
Assumed you're using the packages provided by your distro, IIUC "Mint",
then you can see how it will be configured here:
https://tracker.debian.org/pkg/ardour ->
https://tracker.debian.org/media/packages/a/ardour/rules-1%3A4.7~dfsg-1
However, you could use the distro's source package, add
--with-backends=jack,alsa,dummy \
to the rules file and build a package.
There's also a "None (Dummy)" audio
system which does not need an
actual device, but this only available if Ardour was configured
with
./waf configure --with-backends=jack,alsa,dummy
(Ardour4 debug builds from http://nightly.ardour.org/ have this
enabled).
Thanks for the details. Can this dummy option be used for exports and
will it be in the next Ardour release ?
3:44 a.m.
On Wed, 2 Mar 2016 03:38:30 +0100, Ralf Mardorf wrote:
https://tracker.debian.org/pkg/ardour ->
https://tracker.debian.org/media/packages/a/ardour/rules-1%3A4.7~dfsg-1
However, you could use the distro's source package, add
--with-backends=jack,alsa,dummy \
to the rules file and build a package.
Correction, add it to the variable "BACKENDS":
BACKENDS = jack,alsa
else
waf-configure-options += \
--no-fpu-optimization \
$(empty)
endif
LD_LIBRARY_PATH += :$(DEB_DESTDIR)/usr/lib/ardour4/
waf-configure-options += \
--with-backends=$(BACKENDS) \
3241
days inactive
3242
days old
linux-audio-user@lists.linuxaudio.org
8 comments
5 participants
participants (5)
-
Jonathan E. Brickman -
jonetsu＠teksavvy.com -
Paul Davis -
Ralf Mardorf -
Robin Gareus