Linux-audio-user February 2013

linux-audio-user@lists.linuxaudio.org

142 participants
178 discussions

Basic question about use of a lowlatency kernel

by jonetsu＠teksavvy.com

If a better response time from the kernel is something that's Good, why isn't lowlatency kernels a default in Linux distros (well, at least in Linux Mint and Fedora) If it is So Good, what are the arguments for not having a lowlatency kernel by default ? Any drawbacks ? I presume the Audio-oriented Linux distros do have lowlatency kernels by default, do they ?

12 years, 1 month

Lame outputting float instead of 16bit mp3s

by Julien Claassen

Hello everyone! I have to recode a few mp3s from 16bit 1 channel, 44.1kHz 64kpbs to something even smaller. I choose: 16bit, 1channel, 32kHz, 48kpbs. The 48kpbps was automatically chosen by lame, when I gave it -h. So I did this: mplayer -ao pcm:file=pcm.wav in.mp3 resample --16bit --wav --rate 32000 pcm.wav resampled.wav lame -h resampled.wav out.mp3 The resampled wav has, what it takes: 16bit, 1 channel and 32kHz. But the mp3 always ends up having not 16bit but float. At least mplayer tells me and I tend to believe it, instead of pure mpg321, which tells me something completely different. I treid with and without -v (for VBR) and I tried passing a direct bitrate to lame (using -b). No joy, the mp3 is a little smaller than the original, but not as small as it should be. Anyone an idea, why this might happen and how I might change this? Warm regards Julien ---------------------------------------- http://juliencoder.de/nama/music.html

12 years, 1 month

OT: reply to list..

by James Stone

On Feb 17, 2013 12:18 PM, "Chris Bannister" <cbannister(a)slingshot.co.nz> wrote: > > [No need to include me in the reply, I'm subscribed to the list] > In addition to the fact that many mail clients (like gmail) do not offer reply to list as an option, some think it is better netiquette to reply-all anyway: http://david.woodhou.se/reply-to-list.html Not certain I agree with this tho... James

12 years, 1 month

Re: [LAU] (OT) list addresses (was Re: Audio distros)

by Chris Bannister

On Mon, Feb 18, 2013 at 04:51:29PM +0000, James Stone wrote: > > Sorry for duplicating my other post. Thought it was better keeping it in > one thread.. I'd rather get two mails than none at all. I filter my mails (on certain criteria) into different mailboxes, and if I see a CC to a mailing list on a message, I EXPECT to see that mail in that list mailbox when I get round to reading it! The correct way to avoid duplicate mail is NOT to get CC'd in the first place! sheeze!¹ If I want strange results from the software I'm using, I'd go back to using Windows! ¹ I know that using gmail can be a PITA if you try and follow tried and true accepted practices for conversing on mail lists. -- "If you're not careful, the newspapers will have you hating the people who are being oppressed, and loving the people who are doing the oppressing." --- Malcolm X

12 years, 1 month

Re: [LAU] So what do you think sucks about Linux audio ?

by Len Ovens

On Mon, February 18, 2013 8:44 am, jonetsu(a)teksavvy.com wrote: > There are a few choices in enabling Envy24, and all of them have to do > with either 'stereo' or 'surround'. So far I haven't tried Ardour on Ya, PA tries to map anything more than 2 channels to surround. > this new Linux Mint machine (used Fedora/CCRMA for years, but F18 is not > nice at all so I switched - one nice thing with Mint is that for time to > time they issue a long-lasting release eg. Mint 13 is supported until > 2017 - current is Mint 14, supported for a year, which is what I > currently use, until another long-lasting release is issued), so, so far > I haven't tried Ardour/jack on this new machine and I hope those > 'stereo' and 'surround' things do not interfere with multi-track > recording. There is no reason it should. I have a delta66 which looks to the computer the same as the 1010. PA does not change the settings of the ice1712, it just feeds audio to it. Once jack is running, it doesn't do anything to the ice1712 at all, it just feeds the audio to jack (all 10 channels :P ). Jack decides if any of those channels should be routed anywhere from there. The module-jackdbus-detect that is loaded when PA is started, has an option that allows it not just create the ports but not auto connect them. That might be useful. Jack and ardour are separate and connected as they (or the users) wishes. > > I'm all for having a lean system, even with quad core CPU there's no > excuse in running stuff that is not needed. > On my previous Fedora 15 system I had to shut down jack for firefox to > have sound output. Do I need PA ? The short answer is no. The long answer is that pa may be a better option than other ways of doing the same thing. There are a number of people on this list who hate pulse and don't install it and find other ways of doing what it can do. There are others who use it. > Can it be useful say, to have > jack/Ardour running and at the same time have media from firefox being > played or even recorded in Ardour ? Only you can answer that. Lets ask a different question :) lets say you are using jack to run idjc as a radio station and you wish to interview someone via skype. skype don't know jack (or perhaps much else) but it does deal well with pulse, the pa-jack bridge allows this to happen. It is worthwhile? Lets say your soundcard is firewire... jack can connect to the FW IF, but there is no FW ALSA drivers so PA can't, is it better to use the PA-jack bridge to feed your desktop sound to your amp, or mix the internal sounds output outside the computer? (or run an audio line from the internal card to the firewire card) There are lots of places where having both PA and jack do not make any sense... like when using ardour for recording. > Can PA play with jack ? Is that a > usefulness of having PA around ? PA can play with jack, there are some uses for that. There are also a lot of people who will never have to do those uses too. The question is if you need PA and if you need to be able to feed pa to or from jack for your workflow. -- Len Ovens www.OvenWerks.net

12 years, 1 month

So what do you think sucks about Linux audio ?

by Dave Phillips

Greetings, I've been reading a lot of negative (read: vitriolic) commentary about the world of Linux audio development and applications. I won't bother to say where, just "the usual places" will have to suffice. Of greater interest to me is the commentary itself - it seems to boil down to the following plaints and lamentations (in no particular order) : Too many distros. Too many audio-optimized distros. Not enough native plugins, esp. instruments. Inconsistent support for VST/VSTi plugins. Too many unstable/unfinished applications. Too many "standards" (esp. wrt plugins). Poor external/internal session management. Poor support for certain modes of composition (think Ableton Live). Lack of support for contemporary hardware. Confusion re: desktops, and GUI toolkits. Too difficult to set up audio system. JACK is a pain. Too much conflict/fragmentation within the development community. I'm not so interested in comments on the commentary, I have my own, but say what you will about the list. I figure that most denizens of these lists already have ready replies and responses to these and other criticisms, many of which have been voiced here previously. What I'm more interested in is what *you* think is missing most or just plain wrong about the situation. Please, try to speak your piece without flames or dissing other developers and/or their work. Frankly speaking, I've had enough of that crap, and I'm most thankful these days for such forum amenities as "mute user" and autodiscard, along with the standard filters found in mail clients. <aside> I'm reminded of John Cage's comments regarding the behavior of the NY Philharmonic when they destroyed his equipment during the premire of Atlas Eclipticalis, something to the effect that his concerns had ceased to be musical and had become social, i.e. that he had to figure a way to allow people to be free yet behave themselves with respect towards the common goal (e.g. Cage's music and property). I'm going to guess that he was still working on that up to his death. </aside> So, in your honest and bold opinion as user and/or developer, what do we lack most and what can we do without that we already have ? Please feel free to expand your remarks as you like. I'm planning an article on the topic and will likely use selected comments, subject to approval of course. Best, dp

12 years, 1 month

Re: [LAU] avw lv2 plugins with Ardour 3 on KX Studio

by Aurélien Leblond

Hi Kane, I believe this issue is due to the fact that Ardour doesn't support CV port (it is the same in Jalv). In these plugins, the CV Port are used to control when the Beat Repeater/Slicer would be repeating/slicing. @David: Can you confirm? Kind Regards, Aurélien On Mon, Feb 18, 2013 at 9:57 AM, <wolfbiter(a)gmail.com> wrote: > So after some time spent installing all the packages, I managed to get your plugins to install on my system (latest version of KXstudio). I can see your plugins via the plugin manager of ardour3 (beta 5, the most recent), but when I try to load any of them I get these mysterious errors (one per load attempt): > > "[ERROR]: LV2: "Beat Repeater - Stereo" port 2 has no known data type > [ERROR]: LV2: "Beat Repeater - Mono" port 1 has no known data type > [ERROR]: LV2: "Beat Slicer - Stereo" port 2 has no known data type" > > This is a shot in the dark, but I was wondering if it had to do with this line from http://ardour.org/node/5351#comments > > "Name insert and send ports as "return" and "send" rather than "in" and "out". It is possible that this might break some connections in some existing sessions. " > > I'm extremely excited to be a user of your Beat Repeater and Beat Slicer - let me know what I can do! > > Thanks, > Kane

12 years, 1 month

Renaming/aliasing ALSa sequencer hardware clients

by Julien Claassen

Hello everyone! Can I rename/alias ALSa sequencer ardware ports? I tried the syntax used for aliasing pcm devices, but it doesn't appear to work. I'm looking for this, because I have a couple of USB devices registering as "USB MIDI cable something" and that is a) long and b) not very helpful. Thanks for any hint and kind regards Julien ---------------------------------------- http://juliencoder.de/nama/music.html

12 years, 1 month

Re: [LAU] Audiophile 24/96 volume weirdness

by Chris Caudle

On Fri, February 15, 2013 3:27 pm, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Often, but not always, when I start my machine I'll only get sound from > the left channel. Is L/R Gang selected on the monitor PCM tab? > I have a permanent /home and my OS on a separate partition -- could this > be caused by a config file somewhere on /home and if so, where might I > find it to sort this problem out? Depending on the version of mudita the config file is in either ~/envy24control/profiles.conf or ~/.envy24control/profiles.conf. Newer versions have the file in .envy24control, I think the placement in envy24control was just a mistake in version 1.0. -- Chris Caudle

12 years, 2 months

Getting the audio track from DVDs

by jonetsu＠teksavvy.com

Hello all, Following a more or less recent thread, I started to extract audio from youtube videos, to listen in the car. Neat. Now, I have a few concert DVDs which would be nice to listen to while driving. Anyone got a 'recipe' command line to extract the audio out of a DVD and possibly, to extract only certain songs ? Thanks !

12 years, 2 months

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Linux-audio-user February 2013