Postcards from the Bleeding Edge
Tuesday, December 12, 2006

  Audio Rendering

My cat killing off the rme forced me to think about the musical development process. I have 4 machines available to me that can do some of this work - 2 x86_64, 2 x86. I wondered if ardour, rosegarden, and hydrogen would run over X (linuxsampler is already a client/server application in it's own right), and logged in to the laptop after first enabling X with xhost + on my box, doing a export DISPLAY=mingus:0.0...

Out of the box both 64 studio and FC6 disable connections from X applications, to turn it on you need to put in a

[security]
DisallowTCP=false
line into /etc/gdm/gdm.conf on 64 studio and into /etc/X11/gdm/gdmsomething on FC6.

Logout, and login again. xhost +. ssh dhcp-206. export DISPLAY=mingus:0.0; qjackctl & linuxsampler & # wait, then run ardour, then rosegarden...

Boom. Everything works over X now. AND - Finally, while doing all these applications at the same time, over the net, my laptop ends up with a mere 3MB on swap just to start. The meters in ardour lag a little (hydrogen doesn't), but otherwise I don't notice that I'm actually running over the net!

I realize that I can treat the process of moving all this audio from linuxsampler and rosegarden and hydrogen as a rendering pipeline, much like someone would do the same with graphics. I can for example, move jackd's latencies back to 20ms - and just walk away while all these tools do their magic.

And - importantly - hold cat while rendering - while, finally, she's tired of sleeping on the piano, the mixer, and the keyboard stand, and has moved to a chair behind me, she takes idle opportunities to jump on the keyboard when I'm not looking.

I do a big render of my 26 minute long session, and end up with 600MB on swap - but it completes!

Not only that, but by moving a few other sessions off to other machines, copying them over via NFS, and using X to run client server, I render a couple more sessions, then export as a float wav file mix it all down at the same time using oggenc --resample -q 48000 file.wav. cool. I have to automate this to put tags in. And burn a CD.

Later on I try lame to get mp3s out of the wav files - nothing doing, it reads the floating point data and turns it into digital hash. Either I need to find a command line converter or export to some other format (24 bit int?).

I dump nearly 2 hours of ogg files onto my samsung mp3 player (I don't know what all the furor is over the ipod nano - the samsung rocks, and supports ogg)

Unfortunately, the overhead of doing ardour and linuxsampler has led to a few overruns on the laptop generated stuff which sound aweful. I need to leave the firewire drive plugged in and use that to drive linuxsampler, just in general, drive linuxsampler from a separate drive.

Note to self: And next time, before I fall asleep, remove the earbuds. My right ear hurts like the devil this morning.

As a first pass at rendering all this music, it's not bad, but Sturgeon's Law really applies. There's fragments of 4 old songs in here, a few excursions into covers to try and break me out of habits, and most promising - at least 4 pieces of new sounding material. Yea! I might actually get a pure piano record done by Christmas.

Since I've been effective in using jack sync for the first time, timing information has propigated through it all and I can go on the road, take notes as to what worked and what didn't, when, and then find the precise spot where the midi for all this was and re-edit.

The studio is still a mess of cables and I haven't figured out what carpet (or even maybe hardwood floors) I'm going to put in - and maybe I should build some sort of box to keep all the cables or raise it off the floor. It kind of has that garage band ambiance now though...
 
Comments: Post a Comment

Links to this post:

Create a Link



<< Home
David Täht writes about politics, space, copyright, the internet, audio software, operating systems and surfing.


Resume,Songs,
My new blog, NeX-6, My facebook page
Orgs I like
The EFF - keeping free speech in the world
Musical stuff I like
Jeff, Rick, Ardour, Jack
Prior Rants - my rme-multiface is dead Audio Backstory Audio Milestone "Cat"astrophic RT debugging (part 1) Lessons from Studio64 Not quite yet abandoning x86_64 Legalize off earth land ownership! Personal catch-up Astricon The gender divide makes newsweek
Best of the blog:
Uncle Bill's Helicopter - A speech I gave to ITT Tech - Chicken soup for engineers
Beating the Brand - A pathological exploration of how branding makes it hard to think straight
Inside the Internet Mind - trying to map the weather within the global supercomputer that consists of humans and google
Sex In Politics - If politicians spent more time pounding the flesh rather than pressing it, it would be a better world
Getting resources from space - An alternative to blowing money on mars using NEAs.
On the Columbia - Why I care about space
Authors I like:
Doc Searls
Where's Cherie?
UrbanAgora
Jerry Pournelle
The Cubic Dog
Evan Hunt
The Bay Area is talking
Brizzled
Zimnoiac Emanations
Eric Raymond
Unlocking The Air
Bob Mage
BroadBand & Me
SpaceCraft
Selenian Boondocks
My Pencil
Transterrestial Musings
Bear Waller Hollar
Callahans
Pajamas Media BlogRoll Member

If you really want to, you can poke through the below links as well.

ARCHIVES
06/09/2002 - 06/16/2002 / 07/28/2002 - 08/04/2002 / 08/11/2002 - 08/18/2002 / 08/18/2002 - 08/25/2002 / 08/25/2002 - 09/01/2002 / 09/22/2002 - 09/29/2002 / 11/10/2002 - 11/17/2002 / 12/15/2002 - 12/22/2002 / 12/22/2002 - 12/29/2002 / 12/29/2002 - 01/05/2003 / 01/05/2003 - 01/12/2003 / 01/19/2003 - 01/26/2003 / 01/26/2003 - 02/02/2003 / 02/09/2003 - 02/16/2003 / 02/16/2003 - 02/23/2003 / 03/02/2003 - 03/09/2003 / 03/16/2003 - 03/23/2003 / 04/06/2003 - 04/13/2003 / 04/13/2003 - 04/20/2003 / 04/20/2003 - 04/27/2003 / 05/04/2003 - 05/11/2003 / 05/18/2003 - 05/25/2003 / 05/25/2003 - 06/01/2003 / 06/01/2003 - 06/08/2003 / 06/08/2003 - 06/15/2003 / 06/15/2003 - 06/22/2003 / 06/22/2003 - 06/29/2003 / 06/29/2003 - 07/06/2003 / 07/20/2003 - 07/27/2003 / 07/27/2003 - 08/03/2003 / 08/03/2003 - 08/10/2003 / 08/10/2003 - 08/17/2003 / 08/17/2003 - 08/24/2003 / 08/24/2003 - 08/31/2003 / 08/31/2003 - 09/07/2003 / 09/07/2003 - 09/14/2003 / 09/14/2003 - 09/21/2003 / 09/21/2003 - 09/28/2003 / 09/28/2003 - 10/05/2003 / 10/05/2003 - 10/12/2003 / 10/12/2003 - 10/19/2003 / 10/19/2003 - 10/26/2003 / 10/26/2003 - 11/02/2003 / 11/02/2003 - 11/09/2003 / 11/09/2003 - 11/16/2003 / 11/30/2003 - 12/07/2003 / 12/07/2003 - 12/14/2003 / 12/14/2003 - 12/21/2003 / 12/28/2003 - 01/04/2004 / 01/11/2004 - 01/18/2004 / 01/18/2004 - 01/25/2004 / 01/25/2004 - 02/01/2004 / 02/01/2004 - 02/08/2004 / 02/08/2004 - 02/15/2004 / 02/15/2004 - 02/22/2004 / 02/22/2004 - 02/29/2004 / 02/29/2004 - 03/07/2004 / 03/14/2004 - 03/21/2004 / 03/21/2004 - 03/28/2004 / 03/28/2004 - 04/04/2004 / 04/04/2004 - 04/11/2004 / 04/11/2004 - 04/18/2004 / 04/18/2004 - 04/25/2004 / 04/25/2004 - 05/02/2004 / 05/02/2004 - 05/09/2004 / 05/09/2004 - 05/16/2004 / 05/16/2004 - 05/23/2004 / 05/30/2004 - 06/06/2004 / 06/06/2004 - 06/13/2004 / 06/13/2004 - 06/20/2004 / 06/20/2004 - 06/27/2004 / 06/27/2004 - 07/04/2004 / 07/04/2004 - 07/11/2004 / 07/11/2004 - 07/18/2004 / 07/18/2004 - 07/25/2004 / 08/08/2004 - 08/15/2004 / 08/22/2004 - 08/29/2004 / 08/29/2004 - 09/05/2004 / 09/05/2004 - 09/12/2004 / 09/19/2004 - 09/26/2004 / 09/26/2004 - 10/03/2004 / 10/03/2004 - 10/10/2004 / 10/10/2004 - 10/17/2004 / 10/17/2004 - 10/24/2004 / 10/24/2004 - 10/31/2004 / 10/31/2004 - 11/07/2004 / 11/07/2004 - 11/14/2004 / 11/14/2004 - 11/21/2004 / 11/21/2004 - 11/28/2004 / 11/28/2004 - 12/05/2004 / 12/05/2004 - 12/12/2004 / 12/12/2004 - 12/19/2004 / 12/19/2004 - 12/26/2004 / 12/26/2004 - 01/02/2005 / 01/02/2005 - 01/09/2005 / 01/16/2005 - 01/23/2005 / 01/23/2005 - 01/30/2005 / 01/30/2005 - 02/06/2005 / 02/06/2005 - 02/13/2005 / 02/13/2005 - 02/20/2005 / 02/20/2005 - 02/27/2005 / 02/27/2005 - 03/06/2005 / 03/06/2005 - 03/13/2005 / 03/27/2005 - 04/03/2005 / 04/03/2005 - 04/10/2005 / 04/10/2005 - 04/17/2005 / 05/29/2005 - 06/05/2005 / 06/05/2005 - 06/12/2005 / 06/12/2005 - 06/19/2005 / 06/19/2005 - 06/26/2005 / 06/26/2005 - 07/03/2005 / 07/03/2005 - 07/10/2005 / 07/10/2005 - 07/17/2005 / 07/24/2005 - 07/31/2005 / 07/31/2005 - 08/07/2005 / 08/07/2005 - 08/14/2005 / 08/14/2005 - 08/21/2005 / 08/21/2005 - 08/28/2005 / 08/28/2005 - 09/04/2005 / 09/04/2005 - 09/11/2005 / 09/11/2005 - 09/18/2005 / 09/18/2005 - 09/25/2005 / 09/25/2005 - 10/02/2005 / 10/02/2005 - 10/09/2005 / 10/09/2005 - 10/16/2005 / 10/16/2005 - 10/23/2005 / 10/23/2005 - 10/30/2005 / 10/30/2005 - 11/06/2005 / 11/06/2005 - 11/13/2005 / 11/13/2005 - 11/20/2005 / 11/20/2005 - 11/27/2005 / 11/27/2005 - 12/04/2005 / 12/04/2005 - 12/11/2005 / 12/11/2005 - 12/18/2005 / 12/18/2005 - 12/25/2005 / 01/01/2006 - 01/08/2006 / 01/08/2006 - 01/15/2006 / 01/15/2006 - 01/22/2006 / 01/22/2006 - 01/29/2006 / 01/29/2006 - 02/05/2006 / 02/19/2006 - 02/26/2006 / 03/05/2006 - 03/12/2006 / 03/19/2006 - 03/26/2006 / 03/26/2006 - 04/02/2006 / 04/02/2006 - 04/09/2006 / 04/09/2006 - 04/16/2006 / 04/23/2006 - 04/30/2006 / 05/07/2006 - 05/14/2006 / 05/14/2006 - 05/21/2006 / 05/21/2006 - 05/28/2006 / 06/04/2006 - 06/11/2006 / 06/11/2006 - 06/18/2006 / 06/18/2006 - 06/25/2006 / 06/25/2006 - 07/02/2006 / 07/02/2006 - 07/09/2006 / 07/09/2006 - 07/16/2006 / 07/23/2006 - 07/30/2006 / 08/06/2006 - 08/13/2006 / 08/13/2006 - 08/20/2006 / 09/03/2006 - 09/10/2006 / 09/17/2006 - 09/24/2006 / 09/24/2006 - 10/01/2006 / 10/01/2006 - 10/08/2006 / 10/22/2006 - 10/29/2006 / 11/19/2006 - 11/26/2006 / 11/26/2006 - 12/03/2006 / 12/03/2006 - 12/10/2006 / 12/10/2006 - 12/17/2006 / 12/17/2006 - 12/24/2006 / 12/24/2006 - 12/31/2006 / 01/07/2007 - 01/14/2007 / 01/14/2007 - 01/21/2007 / 01/28/2007 - 02/04/2007 / 02/11/2007 - 02/18/2007 / 02/18/2007 - 02/25/2007 / 02/25/2007 - 03/04/2007 / 03/04/2007 - 03/11/2007 / 03/18/2007 - 03/25/2007 / 04/01/2007 - 04/08/2007 / 04/08/2007 - 04/15/2007 / 04/15/2007 - 04/22/2007 / 04/22/2007 - 04/29/2007 / 04/29/2007 - 05/06/2007 / 05/06/2007 - 05/13/2007 / 05/20/2007 - 05/27/2007 / 05/27/2007 - 06/03/2007 / 06/03/2007 - 06/10/2007 / 06/10/2007 - 06/17/2007 / 06/17/2007 - 06/24/2007 / 07/01/2007 - 07/08/2007 / 07/08/2007 - 07/15/2007 / 07/22/2007 - 07/29/2007 / 07/29/2007 - 08/05/2007 / 08/05/2007 - 08/12/2007 / 08/26/2007 - 09/02/2007 / 09/09/2007 - 09/16/2007 / 09/23/2007 - 09/30/2007 / 09/30/2007 - 10/07/2007 / 10/07/2007 - 10/14/2007 / 10/14/2007 - 10/21/2007 / 10/21/2007 - 10/28/2007 / 10/28/2007 - 11/04/2007 / 11/04/2007 - 11/11/2007 / 11/11/2007 - 11/18/2007 / 11/18/2007 - 11/25/2007 / 11/25/2007 - 12/02/2007 / 12/02/2007 - 12/09/2007 / 12/09/2007 - 12/16/2007 / 12/16/2007 - 12/23/2007 / 12/23/2007 - 12/30/2007 / 01/06/2008 - 01/13/2008 / 02/03/2008 - 02/10/2008 / 02/17/2008 - 02/24/2008 / 02/24/2008 - 03/02/2008 / 03/02/2008 - 03/09/2008 / 03/09/2008 - 03/16/2008 / 03/16/2008 - 03/23/2008 / 03/23/2008 - 03/30/2008 / 03/30/2008 - 04/06/2008 / 04/20/2008 - 04/27/2008 / 04/27/2008 - 05/04/2008 / 05/04/2008 - 05/11/2008 / 05/11/2008 - 05/18/2008 / 05/18/2008 - 05/25/2008 / 05/25/2008 - 06/01/2008 / 06/01/2008 - 06/08/2008 / 06/08/2008 - 06/15/2008 / 06/15/2008 - 06/22/2008 / 06/22/2008 - 06/29/2008 / 07/06/2008 - 07/13/2008 / 07/13/2008 - 07/20/2008 / 07/20/2008 - 07/27/2008 / 07/27/2008 - 08/03/2008 / 08/03/2008 - 08/10/2008 / 08/10/2008 - 08/17/2008 / 08/17/2008 - 08/24/2008 / 08/31/2008 - 09/07/2008 / 09/07/2008 - 09/14/2008 / 09/14/2008 - 09/21/2008 / 09/21/2008 - 09/28/2008 / 09/28/2008 - 10/05/2008 / 10/05/2008 - 10/12/2008 / 10/12/2008 - 10/19/2008 / 10/19/2008 - 10/26/2008 / 10/26/2008 - 11/02/2008 / 11/02/2008 - 11/09/2008 / 11/09/2008 - 11/16/2008 / 11/16/2008 - 11/23/2008 / 12/07/2008 - 12/14/2008 / 12/21/2008 - 12/28/2008 / 12/28/2008 - 01/04/2009 / 01/18/2009 - 01/25/2009 / 01/25/2009 - 02/01/2009 / 03/22/2009 - 03/29/2009 / 05/10/2009 - 05/17/2009 / 05/17/2009 - 05/24/2009 / 05/31/2009 - 06/07/2009 / 06/14/2009 - 06/21/2009 / 06/21/2009 - 06/28/2009 / 06/28/2009 - 07/05/2009 / 07/05/2009 - 07/12/2009 / 07/12/2009 - 07/19/2009 / 07/26/2009 - 08/02/2009 / 08/09/2009 - 08/16/2009 / 08/23/2009 - 08/30/2009 / 09/06/2009 - 09/13/2009 / 09/20/2009 - 09/27/2009 / 09/27/2009 - 10/04/2009 / 10/04/2009 - 10/11/2009 / 10/11/2009 - 10/18/2009 / 10/18/2009 - 10/25/2009 / 10/25/2009 - 11/01/2009 / 11/29/2009 - 12/06/2009 / 12/27/2009 - 01/03/2010 / 01/31/2010 - 02/07/2010 / 02/07/2010 - 02/14/2010 / 02/28/2010 - 03/07/2010 / 03/07/2010 - 03/14/2010 / 03/28/2010 - 04/04/2010 / 04/18/2010 - 04/25/2010 / 05/16/2010 - 05/23/2010 / 05/30/2010 - 06/06/2010 / 06/13/2010 - 06/20/2010 / 06/20/2010 - 06/27/2010 / 07/04/2010 - 07/11/2010 / 07/11/2010 - 07/18/2010 / 07/18/2010 - 07/25/2010 / 08/08/2010 - 08/15/2010 / 08/29/2010 - 09/05/2010 / 09/05/2010 - 09/12/2010 / 09/19/2010 - 09/26/2010 / 09/26/2010 - 10/03/2010 / 10/10/2010 - 10/17/2010 / 10/17/2010 - 10/24/2010 / 10/31/2010 - 11/07/2010 / 11/28/2010 - 12/05/2010 / 12/05/2010 - 12/12/2010 / 12/12/2010 - 12/19/2010 / 12/26/2010 - 01/02/2011 / 03/06/2011 - 03/13/2011 / 03/13/2011 - 03/20/2011 / 05/22/2011 - 05/29/2011 / 08/07/2011 - 08/14/2011 / 08/14/2011 - 08/21/2011 / 09/18/2011 - 09/25/2011 / 10/02/2011 - 10/09/2011 / 10/09/2011 - 10/16/2011 / 11/06/2011 - 11/13/2011 / 01/15/2012 - 01/22/2012 / 04/22/2012 - 04/29/2012 / 06/24/2012 - 07/01/2012 / 08/05/2012 - 08/12/2012 / 08/11/2013 - 08/18/2013 / 03/01/2015 - 03/08/2015 / 10/04/2015 - 10/11/2015 / 11/08/2015 - 11/15/2015 /


Powered by Blogger