Linux-audio-user June 2013

linux-audio-user@lists.linuxaudio.org

76 participants
78 discussions

Re: [LAU] Desktop recorders - was "Another Reality" LP

by Len Ovens

On Fri, June 7, 2013 1:14 pm, Lorenzo Sutton wrote: > On 06/05/2013 10:42 AM, Atte André Jensen wrote: >> On 05/28/2013 10:35 PM, Len Ovens wrote: >> >>> As a UbuntuStudio team member, I would be very interested in your >>> findings. We would like to include a desktop recorder, but would prefer >>> the best we can ship. The xvidcap page says that xvidcap is an OSS >>> audio >>> application. >> >> I wanna join the choir. >> >> I tried the screen casters I know of xvidcap, kazam and recordmydesktop, >> and non of them are really working (terribly loose description, I know). > > Recently, the only effective way I've found to do screen recording with > jack is using ffmpeg - yet this must be the 'original' ffmpeg not libav > which is now packaged e.g. in Debian, which I couldn't get to work with > jack - And this needs to be compiled by hand on debian [1] Now if libav would just stop shipping with links from ffmpeg, debian could ship both... > This is the script I use (adapted from someone else (TM) I found online): > > ffmpeg -f jack -ac 2 -i ffmpeg -f x11grab -r 30 -s 1280x800 -i :0.0 > -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 0 output.avi > > Advantages: > - it works well (with jack) > - very good quality > - good audio/video sync > Disadvantages: > - you have to manually calculate the screen size and rectangle (-s and > -i switches) A script that runs xrandr could probably do that automatically. xrandr has the screen sizes (the size of each monitor with position as well as the size of combined screen size in the case of two monitors). I think there are tools that will give a window size and position as well and most of the screen capture tools allow "rubberbanding" a rectangle, so that should not be hard either... I am pretty sure I could figure that out in tk/tcl... my python is not that advanced yet. > - you need to connect your jack output(s) to the ffmpeg jack input > after you've started recording jack.plumbing from the jack-tools package might make that less painful. Possibly some of the session managers too. > - fairly big output file Most of us have fairly big hard drives these days ;) maybe I just don't do enough recording to make mine seem small. There are enough scripting GUIs around (like tk/tcl and everything newer) it would not be hard to create a GUI to wrap around all that and the recoding below. The biggest stumbling block is a real ffmpeg. Did you have to remove libav? > For the last 'drawback' you can convert to a compressed video format > such as webm. Recently I am use (again stolen, ehm, inspired from some > online forum [2]): > > ffmpeg -y -i "$INFILE" -threads 8 -f webm -vcodec libvpx -g 120 -level > 216 -profile 0 -qmax 42 -qmin 10 -rc_buf_aggressivity 0.95 -vb 2M > -acodec libvorbis -aq 90 -ac 2 $OUTFILE > > This will give a nice webm video which is about 20% the filesize of the > original avi > > Here is a quick short example of the final output: > http://gnufunk.org/~lorenzosu/temp/ffmpeg_grab_test.webm > > > Hope this helps > Lorenzo. > PS This (longer) was also created with the same technique: > http://vimeo.com/36609964 > > [1] I succeed on Debian wheezy amd64 following this: > https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide > [2] I actually found the source for this: > http://ubuntuforums.org/showthread.php?t=1522381&p=9539218#post9539218 - > thanks demizer > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user(a)lists.linuxaudio.org > http://lists.linuxaudio.org/listinfo/linux-audio-user > -- Len Ovens www.OvenWerks.net

10 years, 3 months

balance.lv2

by Robin Gareus

I'm happy to announce balance.lv2. balance.lv2 is a LV2 audio-plugin for stereo balance control with optional per channel delay released in terms of the GPLv2. https://github.com/x42/balance.lv2 balance.lv2 facilitates adjusting stereo-microphone recordings (X-Y, A-B, ORTF). But it also generally useful as "Input Channel Conditioner". It allows for attenuating the signal on one of the channels as well as delaying the signals (move away from the microphone). To round off the feature-set channels can be phase-inverted, swapped and the signal can be downmixed to mono. It features a Phase-Correlation meter as well as peak programme meters according to IEC 60268-18 (5ms integration, 20dB/1.5 sec fall-off) for input and output signals. balance.lv2 is *not* a panner. Even though the controls can be linked, the stereo signal paths are completely independent (except for the down-mix to mono output routing option). Many thanks to Chris 'oofus' Goddard who inspired the current signal flow, beta-tested the plugin and provided very valuable feedback. Greetings to Jörn Nettingsmeier who nagged me about not having a proper balance controller in Ardour and motivated this project in the first place. yours truly, robin

10 years, 3 months

making freewheeling work under ubuntu 13.4 was--Re: disappointed that dependancies for freewheeling are broken in ubuntu 13.4

by Rusty Perez

Hi FLO, Thanks for your help on this! OK, I've tried the command to create a symbolic link, and freewheeling gave me the same error. I've looked in the /usr/lib/x86_64-linux-gnu/ directory, and that library file doesn't seem to be there, unless maybe it's hidden. SOOOO, I'm not sure where to go from here, except to sooperlooper, which i will also try. :-) Is there something I'm missing? Thanks! Rusty On 6/6/13, Florian Paul Schmidt <mista.tapas(a)gmx.net> wrote: > On 06.06.2013 17:32, Rusty Perez wrote: >> Thanks so much FLO, >> I'l give this a try. >> Will these changes be persistant, or must I type these commands each >> time i want to run freewheeling? > > Well, I'll explain a little bit what it should do, and then the answer > should be apparent: The freewheeling program is linked against a very > specific version of a library (the .26 suffix denotes a version). That > precise version does not exist on your system. So what we do is: We take > the existing library (version 27) and create a symbolic link to a file > that LOOKS like the right version. This symbolic link is just another > name for the same file in the directory. And it persists over reboots. > So once it works, all you have to do in the future is to run freewheeling.. > > No further commands should be needed in the future.. > > Flo > > >

10 years, 3 months

Fireface UCX

by Max

Is there anyone who is running a Fireface UCX under Linux successfully? (either via USB or Firewire)? It has a USB Class Compliant mode for Audio Device Class 2 http://www.rme-audio.de/forum/viewtopic.php?pid=86665#p86665 I get nothing but crackles. m.

10 years, 3 months

14-bit CC / (N)RPN midi controllers question

by Tim E. Real

Lacking access to the full midi specs document, I don't know if this question is addressed. I've looked at manuals for products which support them and searched the web but I don't see a clear answer to my question: Is it safe to assume that a product or app which allows binding a *single* HW or GUI control to either 14-bit CC or 14-bit (N)RPN, would *always* send the value LSB, even if the LSB did not change but the MSB did, when the control moves? Do the midi specs address this? Or do you know of examples of such LSB optimizing-out? Thanks. Tim.

10 years, 3 months

nice piece of USB hardware for 7.1 output

by Jörn Nettingsmeier

hi *! in case someone is looking for a similar problem solver: i just received an esi gigaport hd+, which is a usb1 class-compliant, bus powered audio interface that provides 8 discrete unbalanced audio outs. at 135€, it's not quite a steal, but it solves one problem: to be able to listen to 5.1/7.1 content with a laptop. it works with jack out of the box and comes with two headphone outs, one of which plays outs1/2, the other plays a pair-wise mix of all eight outs. there is a row of flashing blue leds as "signal present" indicators, although their threshold is a bit on the high side. sound quality is appropriate, i gave it a quick listen and there is nothing obviously wrong. i bought it for use with a raspberry pi, which is the next thing i have to try - will report back. for now & on my laptop, it runs fine at 124x4, haven't tried to push the latency down more, but since it only has outputs, what's the point anyways? best, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net

10 years, 3 months

realtime midi from audio?

by Rusty Perez

Hi folks, I have a vocal harmonizer pedal from TC electronics which takes input from my guitar, and my vocal microphone and determines what chord I'm playing, and creates vocal harmonies. I'm wondering if there might be a linux program to determine the chords I'm playing,, on my guitar, and turn these in to midi notes, and play a synth or sequencer along with my guitar. I'm not looking so much for a midi guitar because I don't want to modify my instruments, and I don't always play the same guitar. but this vocal pedal does a pretty good job of tracking chords on my guitar, so i was thinking maybe a program could do the same thing, and with that i could create midi accompaniment, maybe driving a sampler or something. this is just a dream fueled by a lack of steady bandmates, but a guy can dream right? thanks so much!.

10 years, 3 months

More oldskool goodness: The Scene

by Louigi Verona

When you are working on a music album, you sometimes run into tunes that don't fit the mood or style of the album. This is what happened to this tune. I love making tunes that have a stadium feel and additionally this is so oldskool and very acid-like! This anthem is a tribute to the Linux Audio scene. http://www.youtube.com/watch?v=2OeowU3RwY0 If you want FLAC, get it from Bandcamp - it comes as a bonus track. For those of you who have already gotten the album, I hope you can get it from your downloads? I am not sure if this is so, so please tell me if it is there. And please keep in mind, the album is absolutely available for 0$. All donations are voluntary and I warmly thank everyone who have supported "Another Reality" LP, it's been very inspiring! Cheers! http://louigi.bandcamp.com/album/another-reality -- Louigi Verona http://www.louigiverona.ru/

10 years, 3 months

Re: [LAU] disappointed that dependancies for freewheeling are broken in ubuntu 13.4

by Rusty Perez

On 6/6/13, Florian Paul Schmidt <mista.tapas(a)gmx.net> wrote: > On 06.06.2013 09:25, Rusty Perez wrote: >> Thanks FLO, > > Hi Rusty, > > so you mind posting your reply to the mailing list again? It is > considered good form to have workarounds for problems visible in the > list archives :D > >> Honestly, I'm just a bit overwhelmed about linux sometimes, so I >> wanted to wine a little bit. But, I suppose I could give fixing it a >> try. >> Actually, after some googling, I've noticed that there are a few bug >> reports already filed. >> >> So, >> about option 1a. Am I creating a file with those lines in it, or just >> executing those commands and the desired outcomes will occur? > > Yes, try these commands in a terminal. They might ask you for your > password (note the "sudo" in front of two of them).. > > >> I apologize, I'm really new at this. >> I think that's probably where I am right now, entering a few commands, >> or creating a script to take care of the problem. I wouldn't even know >> where to begin recompiling. >> You mention that1a s the quick and dirty solution. >> Are there any problems which could arise? > > Well, it's generally considered bad to use a workaround like this. It > should really be fixed in the package. Also we're creating a symbolic > link from one installed library to pretend another version is installed. > This CAN lead to problems later ,on, but it should work well enough to > run freewheeling now. > > Have fun, > Flo > >

10 years, 3 months

[ANN] Qtractor 0.5.9 - The Juliet Quebec release

by Rui Nuno Capela

As an anticipated summer delight... Qtractor 0.5.9 (juliet quebec) is now released! Release highlights: * NSM support (NEW) * Audio buses plugin state restoration (FIX) * MIDI channel file merge/export (FIX) * MIDI editor rescale mode (NEW) * German translation (NEW) Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://downloads.sourceforge.net/qtractor/qtractor-0.5.9.tar.gz - source package (openSUSE 12.3): http://downloads.sourceforge.net/qtractor/qtractor-0.5.9-6.rncbc.suse123.sr… - binary packages (openSUSE 12.3): http://downloads.sourceforge.net/qtractor/qtractor-0.5.9-6.rncbc.suse123.i5… http://downloads.sourceforge.net/qtractor/qtractor-0.5.9-6.rncbc.suse123.x8… - quick start guide & user manual: http://downloads.sourceforge.net/qtractor/qtractor-0.5.x-user-manual.pdf Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - Auto-incremental version numbering of backup session files; brand new versioning mode option added. - Fixed one long as ever MIDI file export bug, which was about washing all self-induced MIDI bank-select (CC#0, CC#32) and program-change (PC#) events into MIDI channel 1, regardless of the source track/channel. - Fixed initial sample-rate settlement on plugin chains for all tracks and buses whenever a session file original sample-rate differs from the current audio device engine (ie. JACK). - New German (de) translation added (by Guido Scholz, thanks). - Now accepting JACK transport tempo and time-tignature changes while in slave transport mode. - Fix ref-count and auto-removal of created files that result from clip merge/export when session is closed but not saved. - MIDI track instrument bank/program selection, from plugin UIs that support it, is now effectively and complete. - Custom connections for dedicated audio outputs from all plugin chains in MIDI tracks or buses are back in business, hopefully restored gain on session load (ticket by yuba, thanks). - Track Properties dialog now dirty after any plugin related change (another head-up by yuba, thanks again). - Tempo Map/Markers dialog is not set initially dirty anymore. - Audio buses plugin state's persistence were found AWOL: while being properly saved as usual, were being restored to default on every session reload (as noticed by yuba, thanks). - NSM (Non Session Management) support is being introduced. - The MIDI clip editor (aka. piano-roll) gets a brand new rescale mode: ctrl+dragging the right edge of a note now rescales all times and duration of all the subsequent selected notes (after an interesting idea/ticket by Joel Leclerc, thanks). - The new MIDI clip editor rescale mode also applicable to event values (eg. note velocities, pitch-bend), while ctrl+dragging the edges of an event vertical bar. - VST plugin (GUI) idle timer makes a comeback. - Hard-wired LV2 UI selection order for plugins which supply more than one option (lv2_external_ui gets always honored first then, as provided via libsuil, X11, GTK and last but not least, Qt4). See also: http://www.rncbc.org/drupal/node/664 Have (lots of) fun. -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

10 years, 3 months

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Linux-audio-user June 2013