Linux-audio-user June 2011

linux-audio-user@lists.linuxaudio.org

116 participants
128 discussions

by Fons Adriaensen

The new zita-at1 and zita-rev1 *.bz2 tarballs turned out to be *.gz compressed instead. Fixed now. Thanks to Joern N. for reporting the problem. -- FA

13 years, 3 months

Re: [LAU] Jack vs. Alsa, PianoTeq demo: Alsa wins!

by Renato

On Wed, 15 Jun 2011 13:05:17 +0200 Lorenzo Sutton <lsutton(a)libero.it> wrote: > Sorry I am writing from memory as I haven't got my laptop with me. > It's the nvidia settings manager and the setting should be under > PowerMizer or something similar (you can recognize it because it > looks like a CPU settings panel). > mmmh maybe it's my video card (geforce go 7300) not supporting it? Here is the powermizer tab http://i.imgur.com/9NdfP.png but I can't change anything. Only thing which seems vaguely related is this "Force full GPU scaling" here: http://i.imgur.com/Qc7J1.png but from the tooltip it seems something that has to do with resolution... cheers renato

13 years, 3 months

Live performance played, made, recorded, mixed and screenplayed with GNU/Linux

by Aurelien

Hi! A video of Sebkha-Chott live performances in 2010. Sebkha-Chott's setup onstage uses: - jackd2 - FFADO (2 Focusrite Saffire Pro 40 daisy-chained) - ardour2 - AMS (4 of them) - Tapeutape - SooperLooper (timebase master) - seq24 - QLC (for lights) - Lives (for VJing) - Mididings - Qmidiroute - ladspa plugs everything go through the machine, which also manages the in-ear monitors. The recording, mixing and mastering were done on B4GSTUD, the studio of the AMMD, which uses: - jackd2 - ALSA (RME HDSP 9652 and HD24XR) - ardour2 The video editing and so on was done with kdenlive I think I didn't forget anything Here it is: www.youtube.com/sebkhachott or straitghly to the video: http://www.youtube.com/watch?v=vTF1k93BaOk -- Aurélien

13 years, 3 months

Digest mode

by Ralf Mardorf

"If you turn digest mode on, you'll get posts bundled together" Will this include all threads of a day or is it just a best of selection? When ever possible I neither will write, nor receive that much mail anymore. But some lists are important for me, so unsubscribing and subscribing again and again wouldn't be a comfortable option. OT: I assume that it will be the same for all lists with the same user interface like this http://lists.linuxaudio.org/listinfo/linux-audio-user ?

13 years, 3 months

RME analog out of phase to ADAT connected Behringer analog out

by Ralf Mardorf

Hi, I made a sound check, that isn't a valid test, just a test to get a coarse impression, but it's positive that for the 'RME analog out / ADAT out test' the signals were out of phase. Shaking the Tree - Youssou N'Dour & Peter Gabriel Uncompressed 16-bit PCM audio Stereo 44100 Hz Linux Player Totem RME HDSPe AIO analog out compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound differs after adjusting levels Linux Ardour RME HDSPe AIO analog out compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound nearly equal after adjusting levels Linux Ardour Terratec EWX 24/96 analog out compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound nearly equal after adjusting levels Linux Ardour RME HDSPe AIO --> Behringer Ultragain Pro-8 compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound nearly equal after adjusting levels Linux Ardour RME HDSPe AIO --> Behringer Ultragain Pro-8 compared with Linux Ardour RME HDSPe AIO analog out Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound audible out of phase between RME and Behringer, what ever sync settings I tried, while the RME always was master This is what I would expect, but I was told that there should be no additional latency. Is this a sync issue? Regards, Ralf

13 years, 3 months

Formant filters?

by Harry Van Haaren

Hey all, I'm sure we all know these artists using a formant filter to shape their basses to "talk", but do we have one of these filters as a LADSPA or even better an Lv2? I've found one LADSPA: http://www.mltframework.org/twiki/bin/view/MLT/FilterLadspa-4300 But that's only one vowel... anybody know of more resources? Cheers, -Harry

13 years, 3 months

cancelling I/O with libsndfile

by Dan Muresan

Hi, I'm trying to cancel an ongoing sf_* I/O operation (from another thread of course). I'm finding this extremely unpleasant to implement. * libsndfile sf_read_* and sf_write_* loop until the requested number of frames has been transferred -- so signals are useless, even if I were to disable SA_RESTART behavior * a pthread_cancel() in the middle of I/O seems to mess up the SNDFILE's data structure to the point that it is unusable later on; so besides having to create a new thread after cancelling, I have to re-open the SNDFILE (or manage a pool of back-up SNDFILE's, complete with duplicate fd's) Also, libsndfile doesn't seem to employ a user-space cache like normal C streams (FILE *) -- instead it goes directly to read(2) and write(2). This of course makes it exceedingly inefficient to read 1 frame at a time (due to repetead syscall overhead). So... it's hard to process low-latency dynamic I/O requests with libsndfile. It would be nice if libsndfile could allow short reads and writes via some sf_command parameter. BTW, I've had trouble sending messages to the sndfile-users mailing list (I subscribed, then it still rejected my mails). In any case, since there seems to be no mailing list archive, it doesn't seem like a very trustworthy mailing list. -- Dan

13 years, 3 months

Re: [LAU] A3 video prev: syncing partially out of sync video and audio in existing files

by Alexandre Prokoudine

On Tue, Jun 14, 2011 at 1:19 AM, drew Roberts wrote: >>>>> IMO, there is definitely something fishy going on. >>>> >>>> Yes, it's called "not being good enough". >>>> >>> And with their budgets, they do not have the resources to fund a Free >>> option to get out from under vendor lock in? Do they benefit from >>> being locked in somehow? Are they not locked in? Do they control their >>> vendors? >> >> Did you intend to send this offlist? :) > > Not at all. Well, I already blogged recently about that regarding graphics tools. Let me provide you a really short summary. 1. A commercial company is about revenue. Canonical does the most successful Linux distribution and still doesn't have revenue per se. What business model would justify spending several millions of dollars a year to work on an NLE fulltime? 2. Integrating into existing open source projects is often difficult. Yes, e.g. Blender was started by Ton who's worked for himself all his life, isn't easily scared by paperwork, knows how to negotiate etc. But most existing projects are run by people who work on them in their spare time. And negotiating with them can be complicated. For instance, two of the major graphics apps teams, GIMP's and Inkscape's, have very diverse views on paid development. If you really look closer at aforementioned Canonical, you might discover that they actually hired several graphics apps developers. Three of Canonical employees were Inkscape developers, and another one was the guy who started Simple Scan (scanning app for GNOME). All four were eventually sucked into fixing stuff and solving infrastracture issues. None of them actually works on their initial projects anymore. They take care about things that bring direct revenue. Yes, there are cases such as GNOME Color Manager and colord where principle developer employed by Red Hat is actually paid by the company to work on that (not initially, only since recently), because Red Hat has two major animation studios as clients, but, again, this is the case where infrastructure had to be fixed (and I mean _really_ fixed). The guy doesn't work on production software per se, becuase production software is not part of existing pipelines at those studios. So we are back to square one. Alexandre Prokoudine http://libregraphicsworld.org

13 years, 3 months

Made with GNU/Linux: 3m171a

by Diego Simak

Hi, I would like to share this song made with GNU/Linux: 3m171a http://soundcloud.com/diegosimak/3m171a It still needs a lot of work, specially on the mastering stage (no compression at all). ubuntu 10.04.2 kernel 2.6.39 jackd 0.120.1 hydrogen 0.9.5 yoshimi 0.060.10 seq24 0.9.2 ardour 3.0 alpha5 Comments, flames or other shots are welcome. Thank you. Diego

13 years, 3 months

OT - syncing partially out of sync video and audio in existing files

by Philipp

Hi, sorry for abusing this list for a mostly video editing question, but I didn't find a proper list and knew that we have some video people on this list. I'd like to fix some videos that have partially out of sync video and audio, meaning that beginning at a certain point in the video the audio is suddenly out of sync by a couple of seconds. There's no constant change, the delay seems fixed once it's there. I wonder how to fix such a thing. The files are xvid encoded videos and vbr mp3 audio inside avi containers. I thought it should be reasonably easy to cut and move the audio (re-encode if unavoidable, but I know it's in principle possible without) and put it back in a container, but I didn't manage. Can someone recommend a program/workflow that would allow this? I tried: - Avidemux: seems like actual editing is not what this program was written for, couldn't figure it out, but it seems close - openshot: couldn't figure out how to separate video/audio - kino: seems to only work with DV-files, apparently takes ages to decode the file, doesn't seem to be what I need - openmovieeditor: I figured it might work by dragging the file to both a video and an audio track, but I got extremely garbled audio output, no idea what's wrong - cinelerra-cv: Doesn't start. No error message, it simply shows no window, nothing. Well, it does something with the screen, but it shows nothing. - pitivi: Doesn't seem like it can play back the video. I can drag the video to the tracks and it starts to draw a waveform, I guess no video thumbnails because of: gst.ElementNotFoundError: pngenc Doesn't seem to be able to play the video. - kdenlive: would require me to install 30 additional packages, total about 200MB, no thanks. I thought it would be a simple task, really nothing fancy. Seems like I was wrong. Regards, Philipp

13 years, 3 months

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Linux-audio-user June 2011