Re: [LAD] tapiir website/source
On 01/19/2011 02:35 AM, Paul Davis wrote: 2011/1/18 Maarten de Boermdb.l...@resorama.com: Hi, I put tapiir and polarbear back online at http://www.resorama.com/maarten/tapiir/ http://www.resorama.com/maarten/polarbear/ http://www.resorama.com/maarten/files/ Sorry for the delay. [sic] Comment Of The Year! But Maarten, its grammatically incorrect. Here, let me fix that for you: Sorry for the delays well, at least for polarbear, it should be sorry for the group delay. :p ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] tapiir website/source
On 01/19/2011 11:58 AM, Arnold Krille wrote: On Wednesday 19 January 2011 10:57:23 Jörn Nettingsmeier wrote: On 01/19/2011 02:35 AM, Paul Davis wrote: 2011/1/18 Maarten de Boermdb.l...@resorama.com: Hi, I put tapiir and polarbear back online at http://www.resorama.com/maarten/tapiir/ http://www.resorama.com/maarten/polarbear/ http://www.resorama.com/maarten/files/ Sorry for the delay. [sic] Comment Of The Year! But Maarten, its grammatically incorrect. Here, let me fix that for you: Sorry for the delays well, at least for polarbear, it should be sorry for the group delay. :p I am just glad that (most) delay-effects get better with repetition. Unlike this joke :-P oh, it does. it just takes some time :-D ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] [OT] 3ghz coax and soldering...
robin, gene, fons, thanks for your replies! On 01/18/2011 10:59 PM, Jörn Nettingsmeier wrote: * source * 5m or so of suitable cable * bnc wall socket * 20m installation cable (-63dB/100m @ 3ghz) * a ghielmetti patchbay (which includes two canare contacts to the patch cord and two bnc on the rear, unfortunately) * another 20m installation cable * bnc wall socket * another 5m cable * sink gene, all bnc equipment used here is rated for 75ohms, and it is in fact not so uncommon in studio and live audio technology (wordclocks, MADI, video, pretty much anything except UHF antenna leads, which are the only 50ohm specimens in daily use here i can think of). i will only use quality connectors (neutrik or equivalent) - no sense in cutting corners there, most of the cost is work time anyways. robin, we do have some conduits for later revisions, but they have not been practical everywhere. i managed to squeeze a few dark fibers into the budget, but otherwise we're pretty much set for the next 30 years (which is why i want to make sure we can do 3ghz). there is also plenty 110ohm aes/ebu+analog cable and cat7, so i don't expect trouble for at least the next decade or so. it's a music school, their investment cycles are long and they won't be able to afford cutting-edge gear anyways. question 1: any hopes for reliable hd-sdi? question 2: how can it be that a kick-ass company like ghielmetti does not offer video patchbays that allow direct connection of coax installation cables, but require rear bnc connections instead? fons, ghielmetti usually has multipin connectors on the rear, which means you solder the cables to the connectors first, then plug, then mount the patchbay. pretty handy. i guess they are not doing it for video because their connectors aren't co-axial. question 2b: is there an alternative for direct rear coax connection, thereby cutting out two potentially disruptive contact surfaces? i think i'll go this route. i just have to find a product to fit the small coax cables i have (the single strands in 5way-multicores). if anybody knows a bnc crimp port for isolated mounting with washer and nut (or, better yet, neutrik d-format for rivet mounting) that takes a 0.6/2.8 coax cable, let me know. question 3: i'm thinking of getting neutrik isolated bnc connectors (the d-type ones that are semi-recessed and thus well protected from clumsy passers-by). but their soldering lugs break the coaxial structure - cause for concern? fons, i had feared this would be an issue as skin effect kicks in. :( need to phone neutrik about this, then :( question 4: do i really want to solder hf stuff (even though the voltages are not too high), or will it unsolder itself eventually? any recommendations as to procedures and tin? gene, thanks for your valuable comments. i'm stashing this email for when i'm older and less fearful. for now you have convinced me i don't want to solder hf leads ;) fons, sma is not really an option - too few mating cycles, too easy to screw up for untrained people (since nobody's familiar with them), and too time-consuming for patchbay use. but i'll keep it in mind for permanent installations in places where stuff needs to be disconnected occasionally for service. best, jörn ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] [OT] 3ghz coax and soldering...
On 01/19/2011 06:35 AM, gene heskett wrote: On Wednesday, January 19, 2011 12:12:05 am Robin Gareus did opine: On 01/19/2011 03:39 AM, gene heskett wrote: On Tuesday, January 18, 2011 09:16:00 pm Robin Gareus did opine: Hi Joern, If it is an option: use Leerrohre (DE for empty tubes ?) to make it future-proof, rather than to rely on cable-standards. In a few years you may want to replace coax with optical or whatever. I think that would translate to wave-guides in English nope. I mean tubes like pipes in the wall or floor that allow one to easily replace cables that run inside those tubes. It'd still be a major re-wiring task but at least one can change the wires easily compared to in-wall mounted cables. Ahh, so, here that is called conduit and can be metallic or more likely in recent years, plastic, glued up just like water pipe and smoother to pull wires through than the metallic stuff. Both need plenty of snot on the wires for a temp lubricant if going very far, and about 3 bends is still the limit for one pull run. I guess Joern's Studio is only 3 or 4 rooms. It's mostly because he mentioned wall sockets that I suggested this. It can also be the wall (or ceiling-mounted) type. I think they're called raceways or just cable-tray. [..] It is currently running inside the ALICE detector @LHC. Yikes. If that ever collapses, it will emp into smoke, and and all electrical stuff for many meters around it. nah It will pull itself into a black hole of course :) That, it can be said is NOT a friendly environment. Even your $15 Casio wrist watch is in danger if you move too fast in that. The magnetic field you mean? The tricky part is get close enough. You'll need a few weeks to undo all the screws on the enclosure and not get kicked out in the meantime. Once you get in there you don't need to move, the electrons inside the watch are already moving fast enough. The only workaround is to have only short interconnects and lots of bulk in between them. Luckily this is an OT post: http://blogs.discovermagazine.com/badastronomy/2010/09/21/dont-cross-the-lhc-stream/ I will allow the comment that when fabricating wave-guide parts and filters for 7Ghz work, which I have done a few of decades ago, those were usually silver soldered because the regular tin/lead solders surfaces oxidized with time much worse, screwing with the skin effect losses. Silver oxide may look fugly, but is still a pretty fair conductor when frequencies are in the realm where skin effect reigns supreme. Just as true inside the wave- guide as it is on the skin of a coax conductor. interesting. I do remember a drawer with at least 15 different kind of solder. Now I know what that silver stuff in there was in there for :) Silver solder, or just silver bearing solder? likely both. It is a very well equipped lab. There was a small hand-torch in there as well. Though I think it was mostly used as a spare lighter :) The latter seems to top out at about 3% siver in an otherwise eutectic allow, but is a noticeably stronger solder mechanically that doesn't oxidize near as fast. I don't use anything else myself but it does raise the iron temps needed by 50-100F, which leads to needing to clean the tips more often. Real silver solder needs a propane or better torch or a tig for heat and you use a borax based flux that melts and forms an airtight puddle of liquid glass over the joint so the oxygen is sealed away from the hot metal, facilitating a nice clean joint when you feed the silver wire in to make a 'sweat' joint, like the plumbers do for copper piping. But the borax should be chipped away and removed once it has cooled as its a bit lossy at those frequencies. Properly done, you get the 'sweat' started, and pull it along by moving the heat (it crawls to the heat) until you have the joint level full of silver but no extra beads sticking out. Don't apply any more silver than what it takes to just seal the joint. Dry fit accuracies of less than a 5 thou gap work very well, wider gaps are correspondingly harder to control. You really need a milling machine to do wave-guide parts correctly. Thanks robin Thank you for the lengthy explanation. ciao, robin ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] [OT] 3ghz coax and soldering...
On 01/19/2011 12:39 PM, Jörn Nettingsmeier wrote: [..] it's a music school, their investment cycles are long and they won't be able to afford cutting-edge gear anyways. Oh and I was already becoming jealous thinking you're planning your own studio and was planning a trip to Essen to admire it.. just curious: Will there be any Linux-boxes inside or would those fall in the cutting-edge gear category? :) robin ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] [OT] 3ghz coax and soldering...
On Wednesday, January 19, 2011 07:25:59 am Robin Gareus did opine: On 01/19/2011 06:35 AM, gene heskett wrote: [...] I guess Joern's Studio is only 3 or 4 rooms. It's mostly because he mentioned wall sockets that I suggested this. It can also be the wall (or ceiling-mounted) type. I think they're called raceways or just cable-tray. Yup. It is currently running inside the ALICE detector @LHC. Yikes. If that ever collapses, it will emp into smoke, and and all electrical stuff for many meters around it. nah It will pull itself into a black hole of course :) They tried that once, took about a year to rebuild things IIRC. :( That, it can be said is NOT a friendly environment. Even your $15 Casio wrist watch is in danger if you move too fast in that. The magnetic field you mean? The tricky part is get close enough. You'll need a few weeks to undo all the screws on the enclosure and not get kicked out in the meantime. Once you get in there you don't need to move, the electrons inside the watch are already moving fast enough. The only workaround is to have only short interconnects and lots of bulk in between them. Luckily this is an OT post: http://blogs.discovermagazine.com/badastronomy/2010/09/21/dont-cross-the -lhc-stream/ Interesting what drifting conversations do when brains get together. [...] Silver solder, or just silver bearing solder? likely both. It is a very well equipped lab. There was a small hand-torch in there as well. Though I think it was mostly used as a spare lighter :) And of course its out of gas if you need to fire it up and get enough heat out of it to do a silver joint. There is a Murphy's Law corollary about that I've seen someplace. ;-) [...] Thank you for the lengthy explanation. NP. When I get started, like most old farts with a lng history in broadcasting, I don't know when its time to shut up. ;-) ciao, robin Thanks Robin -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) No two persons ever read the same book. -- Edmund Wilson ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] [LAA] gst123-0.1.4
On Sun, Jan 16, 2011 at 6:13 AM, Stefan Westerfeld ste...@space.twc.de wrote: Website: http://space.twc.de/~stefan/gst123.php Download: http://space.twc.de/~stefan/gst123/gst123-0.1.4.tar.bz2 Stefan -- Thanks for making this new version of gst123 available... I tried my usual torture test on gst123 0.1.4 and it's still having the same problem on the KCRW live stream, which IMHO stems from some kind of memory leak related to changing of program text (since other streams that don't change the program text don't seem to crash). The crashes happen after several hours of playing, usually after a new program text label is output on the stream. (note parsing oddities seen before a crash e.g. Title : HTML Artist : ). I ran the test by outputting to each of the stereo channels on an ice1712 soundcard, which allows for five simultaneous gst123 instances to run (see the end of http://nielsmayer.com/npm/dot-asoundrc.txt for details on the setup). gnulem-411-~/gst123-0.1.4 gst123 -a alsa=66ch12 http://64.12.61.1:80/stream/1046 Playing http://64.12.61.1:80/stream/1046 Title : All Things Considered - 5 Artist : Album : Genre : Eclectic, Alternative, NPR, Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 168.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 170.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 169.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 170.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 180.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 180.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 180.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 180.0 kbit/s Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Title : Art Talk - All Things Con Artist : Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Title : All Things Considered - 5 Artist : Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Title : Which Way, L.A.? - 7P-8P Artist : Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Title : Garth Trinidad 89.9FM Hand- Artist : Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Title : HTML Artist : Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s Title : Raul Campos 89.9FM Hand--Pi Artist : Codec : MPEG 1 Audio, Layer 3 (MP3) Bitrate : 179.0 kbit/s *** glibc detected *** gst123: free(): invalid pointer: 0x7fe0540f4410 *** === Backtrace: = /lib64/libc.so.6[0x3680a75336] /usr/lib64/libgstreamer-0.10.so.0[0x369b2344a9] /usr/lib64/libgstreamer-0.10.so.0(gst_mini_object_unref+0x121)[0x369b2578c1] /usr/lib64/libgstaudio-0.10.so.0[0x38eae18716] /usr/lib64/libgstaudio-0.10.so.0(gst_ring_buffer_release+0x16e)[0x38eae0b11e] /usr/lib64/libgstaudio-0.10.so.0[0x38eae135c8] /usr/lib64/libgstreamer-0.10.so.0(gst_element_change_state+0x2c)[0x369b242f8c] /usr/lib64/libgstreamer-0.10.so.0[0x369b2464e8] /usr/lib64/libgstreamer-0.10.so.0[0x369b232954] /usr/lib64/libgstreamer-0.10.so.0(gst_element_change_state+0x2c)[0x369b242f8c] /usr/lib64/libgstreamer-0.10.so.0[0x369b2464e8] /usr/lib64/libgstreamer-0.10.so.0[0x369b232954] /usr/lib64/gstreamer-0.10/libgstplaybin.so(+0x1b380)[0x7fe0618ae380] /usr/lib64/libgstreamer-0.10.so.0(gst_element_change_state+0x2c)[0x369b242f8c] /usr/lib64/libgstreamer-0.10.so.0[0x369b2464e8] /usr/lib64/libgstreamer-0.10.so.0[0x369b232954] /usr/lib64/libgstreamer-0.10.so.0[0x369b2659f0] /usr/lib64/gstreamer-0.10/libgstplaybin.so(+0x118cf)[0x7fe0618a48cf] /usr/lib64/libgstreamer-0.10.so.0(gst_element_change_state+0x2c)[0x369b242f8c] /usr/lib64/libgstreamer-0.10.so.0(gst_element_change_state+0xaf)[0x369b24300f] /usr/lib64/libgstreamer-0.10.so.0[0x369b2464e8] gst123[0x408dca] gst123[0x405f19] /usr/lib64/libgstreamer-0.10.so.0[0x369b237cb4] /lib64/libglib-2.0.so.0(g_main_context_dispatch+0x22e)[0x368223923e] /lib64/libglib-2.0.so.0[0x368223cc28] /lib64/libglib-2.0.so.0(g_main_loop_run+0x1a5)[0x368223d075] gst123[0x407212] /lib64/libc.so.6(__libc_start_main+0xfd)[0x3680a1eb1d] gst123[0x404b89] === Memory map: 0040-00416000 r-xp fd:00 1151830 /usr/local/bin/gst123 00615000-00616000 rw-p 00015000 fd:00 1151830 /usr/local/bin/gst123 00616000-00619000 rw-p 00:00 0 02376000-0267d000 rw-p 00:00 0 [heap] 309360-3093697000 r-xp fd:00 7756 /usr/lib64/libfreetype.so.6.3.22 3093697000-3093896000 ---p 00097000 fd:00 7756 /usr/lib64/libfreetype.so.6.3.22 3093896000-309389c000 rw-p 00096000 fd:00 7756 /usr/lib64/libfreetype.so.6.3.22 3093a0-3093a34000 r-xp fd:00 7911 /usr/lib64/libfontconfig.so.1.4.4 3093a34000-3093c34000 ---p 00034000 fd:00 7911 /usr/lib64/libfontconfig.so.1.4.4 3093c34000-3093c36000 rw-p 00034000
