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Request for advice: remote Linux server playing audio on local Windows system

by Nikhil Nair

Hi, I'm pretty new to Linux audio, but a project I'm working on is going to need me to generate musical notes on a remote Linux server, in (near-)realtime (i.e. changing the sound output based on realtime events). I have basically no familiarity with MIDI etc., but the easiest interface I've found for the starting and stopping of notes, so far, is the FluidSynth API. That's not the issue, however: the trick is getting the audio back to my Windows machine with low-ish latency, and in reasonable quality. To add a little interest to the scenario..., my Windows machine is also behind NAT and a firewall. The ping round-trip time is under 30 ms, though, so I'm hoping latencies of around 200 ms might be possible. Just to make life more interesting, I'd rather not have to use X Windows at all on the remote machine, as I'm blind, and haven't even begun to think about the ins and outs of accessibility of a remote X server (and, frankly, would rather just not go there for now). (The application I'm working on may interest you, BTW: I'm converting financial data, particularly currency price charts, into soundscapes, for "visualising" recent price movements. If it were just a one-off, I could convert it into an audio file and download it; but, instead, I want it to be interacctive, so I can rewind through the image, step backward or forward frame by frame, etc. I'm going to have fun with this!) I've been considering a few methods of getting the audio to my Windows machine, but none of the options I've come up with so far seem to quite work as I want. Here's what I've considered. 1. Send audio to JACK, then send it to the Asterisk PBX via the App_Jack application; listen to the audio via a softphone on the Windows machine, connecting to the Asterisk server via SIP. Sound quality wouldn't be ideal - 8KHz mono - but I could live with that. Unfortunately, it looks like App_Jack doesn't successfully connect to a JACK server: a bug report was lodged about it over 3 years ago, marked severe, but doesn't seem to have been fixed as yet. 2. Send audio via Jack and a streamer (probably DarkIce) to an Icecast2 server; then use a media player such as WinAmp or MPlayer. The problem here is buffering: 10-20 seconds of latency just isn't acceptable for the realtime aspects of the project, and I don't know if there's a way to get a media player to do unbuffered playback (a quick Google search seemed to indicate not). 3. Use netJACK1 to play audio direct from JACK (that's the only one of the 3 networked-JACK solutions mentioned on the JACK website that's recommended for use over a WAN). Unfortunately, once I dug into this, it looks like the assumption is that the audio will be played on a Linux box: there doesn't seem to be any provision for having the Windows machine as the one doing the audio playing. I did have a quick look at netJACK2, but that seems to assume the two machines are on the same LAN - you don't even specify the IP address to connect to! 4. I wondered about using PulseAudio. However, that seems quite tricky to set up without X on the remote machine, and I'm not at all clear about the NAT traversal issue. 5. I also wondered about NAS: I gather it's very outdated, but it sounds like about what I'm after. However, I couldn't find a Windows download; and FluidSynth doesn't have a NAS interface, as far as I understand it. TiMidity does, though, so I'd just need to work out how to send it MIDI events from software... Tunneling through a forwarded port (using ssh) may help in some aspects, but I'm not sure. AT least, it adds an extra set of possibilities, as do VPNs. As you can see, I've been wracking my brains over this for a couple of days, and while I've felt I'm really close on more than one occasion, I've not quite got there. Any input would be very much appreciated! Alternatively, if there's a better place for me to be asking this question, a pointer would be very helpful. Cheers, Nikhil.

11 years, 3 months

"[...] realtime kernel [...] prepare for a future [...]" - [1]

by Ralf Mardorf

[1] http://lwn.net/Articles/572740/ Reawoken: http://marc.info/?l=linux-rt-users&m=140615962203369&w=2

11 years, 3 months

Re: [LAU] DIY acoustic absorbers?

by Moshe Werner

Hi Gabbe, To my understanding this would have a positive effect. There are actually some commercial products that are designed "your" way. But בתאריך 24 ביול 2014 09:21, "Gabriel Nordeborn" <gabbe.nord(a)gmail.com> כתב: > Time to revive this old thread... Thank you for all of your messages and > thoughts! After what feels like ages, I finally have time to start this > project for real. > > A question about low frequency absorption/bass traps: > > - One of the best ideas I've seen around for doing DIY bass traps is to > cut triangles from the rock wool, and then place the triangles in the > corners, from bottom to roof. I won't be able to do it that way just yet, > BUT, I wonder whether it would be an idea to just stack rock wool panels on > top of eachother in the corners, and achieve at least some low end > frequency absorption? This wouldn't cover the entire area of the corner, > but would still make some I guess. My monitors are very small and don't > produce a lot of low end, and I won't be recording a lot of bassy stuff > either, so maybe this could suffice as a starting point? See image attached. > > Thoughts? thanks again for all the info! > > > On Sun, May 25, 2014 at 10:07 PM, Moshe Werner <moshwe(a)gmail.com> wrote: > >> >> >> >> >> >> Hi, >> >>> >>> I recently moved to a new flat, and I've just got my studio properly >>> setup in one of the rooms. >>> >> Congrats! I hope we get a lot of your beautiful music out of this room:) >> >>> Problem is, the room is rather horrible acoustically. As this is the >>> room I've got to play with, I'm going to have to make the best of it >>> acoustically. >>> >>> So, my question is about DIY acoustic absorbers. I'm most likely looking >>> to build absorbers both for mid/hi-end (I'm thinking the classical rock >>> wool ones you place spaced out a bit form the walls) and for the lower end, >>> but I am very much open for suggestions. Here's some specs of my setup: >>> >> >>> - The room is roughly 3.60m wide, 3.40m long and 2.50m high. I think at >>> least one wall is concrete. >>> >> As first step I would consider to mix facing the narrow side of the room >> >> Plus always keep everything nice and symmetric. >> Also I would recommend to measure the room to see what problems you're >> dealing with. http://www.roomeqwizard.com/ is available for Linux AFAIK. >> >> - My mixing position/monitors is in the middle of the front wall. I sit >>> about 1.20m out from the wall. >>> >> Have you heard about the 38% rule? If not read up on this >> http://realtraps.com/art_room-setup.htm, also covers early reflection >> points. >> >> >> >>> - My monitors are small, a set of Adam A3X (so 3" elements I guess). It >>> basically gives very low bass response, so I can hear fairly OK down to >>> about 80hz, rapidly declining down to 60hz where there's nothing left. >>> >> Less low energy buildup, but as you mentioned you won't know whats down >> there so I would recommend you to treat for lower frequencies in case you >> upgrade your speakers in the future. >> >>> - I am not terribly dependent on mixing at high volumes, if that matters. >>> >> It matters a bit as there is less energy to be absorbed, but again I >> would treat properly just in case you want to listen with higher SPL's, so >> it doesn't totally change the EQ of your mix (anyway it will change with >> sound pressure level because of equal loudness contour >> <http://en.wikipedia.org/wiki/Equal-loudness_contour>) >> >>> >>> What I currently have is: >>> - Two large bookshelves along the wall right behind my mixing position >>> acting as diffusors. These go almost all the way up to the ceiling, and has >>> stuff unevenly stacked at different heights/positions in the bookshelf. >>> They cover 1.60m in the middle of the back wall. >>> >> I've got good experience with bookshelves in homestudios, given they >> aren't to close behind the listening position. >> >>> - I also have a fairly large carpet on the floor in the middle of the >>> room. It probably doesn't do that much, but maybe it does a little. >>> >> It does a little in preventing flutter echo of high frequencies. >> >>> >>> My question then is; are there any effective ways of acoustically >>> treating this room? Of course, given the topic of the e-mail, I'm very much >>> willing to do my own DIY solutions, if that's a viable option. What I have >>> been thinking is doing what I mention above; classical absorber "panels", >>> and bass traps. >>> >> I would treat the corners and early reflection points first. >> In a homestudio of a friend we filled the corners with rockwool made a >> wooden frame and covered them with fabric. >> Early reflection points can be treated with 10-15cm thick "classical >> absorber panels". >> For our live room we've done something else, we made wooden slat covered >> frames and filled the cavity with rockwool . >> I like what it does to the room as it doesn't make it dead but tames the >> response quite nicely. >> >> >>> But, before I start anything, I'd very much like input from people who >>> actually know what they're talking about (I'm looking at you on this list >>> ;) ). So, does anyone have thoughts/suggestions for me? Any recommended way >>> of doing this? >>> >>> Thank you very much for any help and any replies! >>> >> Best of luck! >> Moshe >> >> >> >

11 years, 3 months

Re: [LAU] A short story: from zero to recording the drums in a budget

by Burkhard

This thread was just what I needed. Thank you, Carlo and all! - Burkhard -------- Ursprüngliche Nachricht -------- Von: Carlo Ascani <carlo.ratm(a)gmail.com> Datum: An: Fons Adriaensen <fons(a)linuxaudio.org> Cc: linux-audio-user <linux-audio-user(a)lists.linuxaudio.org> Betreff: Re: [LAU] A short story: from zero to recording the drums in a budget 2014-07-22 10:23 GMT+02:00 Fons Adriaensen <fons(a)linuxaudio.org>: > > I've got a similar setup: 512M, Arch + windowmaker, > but can't get A3 to run on it in any usable way - it > just eats too much memory. Any tricks ?? > Not really, sorry. And honestly, the only thing I am able to do with so little ram is to record. No way I can do editing, and plugins neither. > Ciao, > > -- > FA > > A world of exhaustive, reliable metadata would be an utopia. > It's also a pipe-dream, founded on self-delusion, nerd hubris > and hysterically inflated market opportunities. (Cory Doctorow) > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user(a)lists.linuxaudio.org > http://lists.linuxaudio.org/listinfo/linux-audio-user -- Carlo Ascani | carlorat.me skype: carloratm irc: carloratm@freenode _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-user

11 years, 3 months

sd card / firewire

by rosea.grammostola

Hi, I need a new laptop, not specific for audio but would be nice to be able to run an pro-audio card. I'm doubting between a lenovo t400 and a x220. Would it be possible to use firewire on the x220 (via an sd card -> firewire converter)? Regards, /r

11 years, 3 months

OT Microphone recommendation

by Ivan K

Well, I ordered my microphone preamp, now I need a microphone. Based on the archives of this list and my budget, I identified three. What I mostly will be doing is: (1) Recording voice, either speaking or singing (2) Recording acoustic instruments (classical guitar, clarinet) (3) Recording chamber music. So the three microphones are: (a) Shure SM57 (Is there a difference between the SM57 and SM57-LC?) (b) Shure SM58 (Though which one: the SM58-LC, SM58-CN or SM58S ?) (c) CAD gxl 2200 large diaphragm condenser $60 Just from my naive understanding, the SM57 seems like it might be the best "general purpose" microphone for my needs. Do people have advice or other recommendations? Thanks. Eventually I will buy a second microphone for stereo recording.

11 years, 3 months

Phone to computer adaptor

by Bob van der Poel

I currently have a "skype" phone connected to USB which works just fine to make calls. Only problem is that the cord is short :) and the quality is not the greatest. So, can I connect a regular POTS phone via a USB thing? What are they called and do they work with Linux? I assume that the skype phone just acts like a soundcard ... same with what I want? Thanks. -- **** Listen to my FREE CD at http://www.mellowood.ca/music/cedars **** Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

11 years, 3 months

by Jonathan E Brickman

Right now I'm using Fluidsynth running a soundfont which I customized a good bit, but it's just not quite what I want; I want it recognizably a string section, 88-key range, rumbly power in the low, smooth but a definite bit of fuzz in mids and highs. I'll take any technology, and will do payware, as long as it runs well on 64-bit Arch Linux. Anyone got a recommend? -- Jonathan E. Brickman Ponderworthy Music | jeb(a)ponderworthy.com<mailto:jeb@ponderworthy.com> | (785)233-9977 | http://ponderworthy.com

11 years, 4 months

OT Microphone recommendation

by Grekim Jennings

On Wed, 16 Jul 2014 11:41:23 -0700 Ivan K <ivan_521521 at yahoo.com> wrote: > Well, I ordered my microphone preamp, now I need a microphone. > Based on the archives of this list and my budget, I identified > three. What I mostly will be doing is: > > (1) Recording voice, either speaking or singing > (2) Recording acoustic instruments (classical guitar, clarinet) > (3) Recording chamber music. > > > So the three microphones are: > > (a) Shure SM57 (Is there a difference between the SM57 and SM57-LC?) > > (b) Shure SM58 (Though which one: the SM58-LC, SM58-CN or SM58S ?) > > (c) CAD gxl 2200 large diaphragm condenser $60 > > Just from my naive understanding, the SM57 seems like it might be the > best "general purpose" microphone for my needs. > > Do people have advice or other recommendations? Thanks. > Eventually I will buy a second microphone for stereo recording. Skip the dynamic mics for now and buy a matched stereo pair of condensors. I have a pair of small studio projects condensors and while I can't read the labels on them anymore, they still sound like on the first day. And this pair came with a stero mount;-) If you insist on going dynamic (only when you record directly on the mic, not for chamber and/o ambiance), decide between the SM57 and SM58 if you will. The SM57 seems better suited for instruments, the SM58 is the de-facto (backup) standard on many stages for good reasons. If you can't decide between the two, get a Beta58 or maybe an AKG in the same price-range. Worth it, the beta58 sounds better then the sm58... But for what you want, a stereo-pair of small condensors, maybe additionally a large condensor for voice. Or stereo pair of large condensors from AKG or comparable... - Arnold Was is the Studio Project C4's? I have a pair I use for remote recording...drum overheads mostly. Good value and they are pretty versatile with 3 capsule/patterns. They are around $350 for the pair. There are also some Audio-Technica 2020 condensers for $100 each. They might be okay too. Grekim

11 years, 4 months

Ardour complains disk system can't keep up

by jim

Hiya, I've got a Zareason media box http://zareason.com/shop/MediaBox-5440.html with 8 GB RAM running AVlinux (a debian flavor); I use Ardour pretty much exclusively, that and the vi editor. The system can record a single track with no problem. It occasionally fails if I try to record two simultaneous tracks. If regularly fails if I try to record four or more tracks. The complaint is always that the disk system cannot keep up. Question: would just blindly replacing the spinning disk with SSD be a likely fix and an overall good idea? Question: what info should I capture and email to get appropriate help? Question: what commands will yield useful info for this diagnosis? (I like the command line but forget which commands do what other than the usual suspects for basic use.) Hopefully, with thanks, jim in SF

11 years, 4 months

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