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  • netcat as a multithread server

    - by etuardu
    Hello, I use netcat to run a simple server like this: while true; do nc -l -p 2468 -e ./my_exe; done This way, anyone is able to connect to my host on port 2468 and talk with "my_exe". Unfortunately, if someone else wants to connect during an open session, it would get a "Connection refused" error, because netcat is no longer in listening until the next "while" loop. Is there a way to make netcat behave like a multithread server, i.e. always in listening for incoming connections? If not, are there some workarounds for this? Thank you all!

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  • How can I batch convert SVG files containing text to PDF files (specifically on CentOS 5.3 x86_64)?

    - by molecules
    I would like to programatically convert SVG files to PDF files. However, the SVG files contain text that must be searchable in the generated PDF files. Also, it has to work on Red Hat Enterprise Linux 5.3 or CentOS 5.3 for the x86_64 architecture. It would be nice if it were Open Source or at least not very expensive. Here is what I've tried. All of these, except Batik, work fine on Debian Lenny. Inkscape I can get it installed using autopackages from http://inkscape.modevia.com/ap, but when I use it from the command line, the text is not searchable. Batik rasterizer [sic] When it converts SVG files to PDF files, the text is no longer searchable. svg2pdf The source for this and several of its dependencies are available to download. I have been trying to get it to compile on CentOS, but haven't had success yet. I found a precompiled version for Debian x86_64, but it doesn't work on CentOS. rsvg-convert Generated PDF isn't searchable on CentOS 5.3. Perhaps installing a newer version of cairo would help. Thanks to DaveParillo for mentioning rsvg-convert (on superuser). SOLUTION (but perhaps some of the above will still be useful to the reader) princeXML It works fine on CentOS when installed from source. For some reason it doesn't work when installed from the .rpm. Thanks Erik Dahlström! (provided solution that worked for my case on stackoverflow) Cross posted on stackoverflow

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  • Broadcomm WIDCOMM A2DP Quality Adjustment

    - by snicker
    So I got a sweet pair of bluetooth A2DP headphones for a sweet, sweet price (Motorola A805, if you were wondering). They sound great paired with an iPhone. However, when I pair with a computer using the latest and greatest WIDCOMM drivers, the quality is quite poor, almost un-listenable... clicking, popping, scratching. The remedy on one machine was using BlueSoleil, another bluetooth stack, as there is an adjustment for the Bitpool settings that allow you to jack the quality up. Sounds great. However, the bluetooth chipset in my other machine is not supported by BlueSoleil... so I'm stuck with the WIDCOMM stack. So the question is... Is there an undocumented way to turn up the quality for A2DP in the WIDCOMM drivers? first question on SU, usually lurking on SO.. =]

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  • Windows 7 Line In Delay Issue

    - by CheeseConQueso
    Not sure if this question should be posted on a different stack exchange site, so if you find that it should not be posted here, please move it. Either way, if you know the solution, please advise. I'm running Windows 7 Pro 32-bit on my Dell Latitude 2100 netbook and I'm having an issue with the line in device/driver/functionality. The device & driver are stock: Driver Date: 7/13/2009 Driver Version: 6.1.7600.16385 I'm almost sure that the manufacturer of the sound card is RealTek. The problem is that there is a delay (when monitoring input) between the source and the speakers. My setup is bass guitar running through a 12' long instrument cable (1/4") with a 1/4" female to 1/8" male adapter into the line in port on the computer. Then the 15' long headphones/line out cable goes into a standard set of powered speakers. How do I get rid of this delay? Thanks for any help.

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  • Two different subwoofers aren't working on my machine or my phone

    - by Philluminati
    I have speakers that come with my computer. Two small desktop speakers and a subwoofer with a base volume control on the back. It's worked for years. I was listening to Spotify on my speakers as loud they would possibly go and with the base turned up to max and suddenly the subwoofer stopped working. I've plugged the speakers into my Android HTC Desire Z handset and again, the desktop speakers play music but the subwoofer doesn't (even after fiddling with the volume control). So I figured I'd broken it. I went to Amazon and bought a replacement one. I bought this one: http://www.amazon.co.uk/dp/B002N46YD8/ref=pe_217191_31005151_dp_1 but it doesn't work either, on either my desktop nor my Android phone. I had a play with alsamixer and the LFE and center controls are switched on and the speakers are okay... but still no base. Am I unlucky enough to bought a new subwoofer which is already broken out of the box or is there something else which is wrong and I could look into please? Are there any other tests which I could perform to see if the problem is me or not?

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  • Capture documents in bitonal, or grayscale then downsample

    - by Jason R. Coombs
    I'm about to embark on a document archival process. I'm going to spend a lot of good money to archive some paper (actually microfiche) to TIFF images. I have a choice of 300-dpi bitonal (2-bit, black/white) or 300-dpi grayscale (8-bit). Cost is the same for either format. Data volume (and thus image size) is not a factor. It seems to me that the grayscale, since scanned at the same resolution as the bitonal, would always contain more information and could always be downsampled to the equivalent bitonal image. Are there any downsides to selecting grayscale, and then later downsampling to bitonal if desired? In other words, is it possible that the scanning software will perform a more accurate (or more legible) representation than a grayscale image converted to bitonal?

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  • Optimum number of threads while multitasking

    - by Gun Deniz
    I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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  • What can I do to enhance MacBook Pro internal mic sound quality in iMovie?

    - by gaearon
    After using MacBook for two years, I bought 17'' MacBook Pro. I'm pretty happy with it, performance and all, but I also was going to record some music videos for YouTube. I play guitar and sing. However I was extremely disappointed with the sound quality that comes by default. I'm 100% sure my 13'' MacBook mic was much better at recording music and singing. Currently mic can't event handle acoustic guitar, outputting sound you'd think was recorded 5 years ago in ARM format on a Nokia phone on a loud concert. It totally feels like some lame filter is cutting low and high frequencies. I want to know what settings (visible or hidden) in iMovie or Mac OS itself I might want to tweak in order to get my MBP mic record clean sound.

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  • Gifsicle: How to set it to not overwrite the original GIF file if the resulting modified GIF file is larger than the original?

    - by galacticninja
    About Gifsicle: Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. One of its features is (from its website): Optimize your animations! This stores only the changed portion of each frame, and can radically shrink your GIFs. You can also use transparency to make them even smaller. Gifsicle’s optimizer is pretty powerful, and usually reduces animations to within a couple bytes of the best commercial optimizers. I call Gifsicle through this .BAT file in the Right Click - 'Send to' Menu: @echo off :compressFile "C:\Programs\Compression Scripts\gifsicle\bin\gifsicle.exe" --batch -V -O3 %1% echo. echo. SHIFT if exist %1% goto compressFile PAUSE This animated GIF file, however: http://i.minus.com/i7WdodY5Zwot3.gif, when its compression is optimized with Gifsicle with the above commands, results in a larger-filesized GIF file. Gifsicle overwrites the original GIF file with the resulting larger-filesized GIF file. Initial filesize: 7.57 MiB (7,942,886 bytes). After running through the above commands with Gifsicle: 7.64 MiB (8,017,622 bytes). Is there a way to prevent Gifsicle from overwriting the original file if its output file is larger than the original file, while still overwriting the original file if the output file is smaller? Details: OS: Windows 7 Gifsicle version: 1.63, from the binary provided here: http://www.lcdf.org/gifsicle/ Gifsicle manual

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  • From a quality perspective, what is better: Turning volume up in the software, in the OS, or on the speakers?

    - by Qqwy
    I kept thinking about this, and out of sheer curiosity, I decided to ask: If music isn't loud enough. How do I get the best quality?(Even if the difference is in fact so small it's neglectible) By making the music louder in my music player, game or other sound-producing software program. By raising the volume at the Operating System level (for instance, by clicking the 'speaker' icon on the windows bar and turning the volume up) By turning the volume up on the Amplifier or Speakers that are attached to your computer, and thus changing the volume on the 'hardware' Does programs vs OS matter? Does software vs. hardware matter? Thanks, Qqwy

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  • Sound settings are always reset when restarting Mac

    - by RahulVyas
    I have ideneb Mac OS X 10.5.7. I have installed vodooHDA.kext for sound because any other was not working. But whenever I restart my system sound settings are reset to default and I am unable to hear any sound. To hear sound I need to change some sliders in system configuration every time. Isn't there any permanent solution?

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  • How to kill volume when headphones pulled out

    - by wonea
    I often use headphones in order to listen to music in work time. However my chair tends to occasionally have the tendency to yank the headphone cable from my laptop. Now with my Android phone this wouldn't be a problem as the music will automatically stop playing. However, Windows does not kill the volume and instead re-routes the sound to my laptop internal speaker system. Aside from turning off my laptop speakers - is there a small utility available which serves my purpose of killing the volume so my work associates aren't inflicted with erroneous musical tastes?

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  • image filter that spits out pi

    - by patrickinmpls
    I've seen this before but I forgot what's its called. Does anyone know of software that takes a picture and spits out an image of the number pi, ie. 3.14... not the symbol? It basically kinda looks like ascii art but the numbers are different shades of gray so it is like a black and white photo. Thanks!

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  • FM Transmitter for the Home

    - by greggannicott
    After asking this question regarding piping music through my home I'm looking to buy an FM transmitter. I'd like to connect it to my home pc (ie. into the speaker port), and I'd then control the output with my iPhone (ie. using Apple's Remote software). The problem is, given that almost every FM transmitter is advertised to be used in the car (ie. an iTrip) it's proving very tricky knowing which one would be ideal for the home. First, has anyone tried this? Did it work ok or was there simply to much interference for it work. Secondly, if it did work ok, can anyone recommend a reasonable transmitter? For what I need it seems like an ideal solution, so given that I'm struggling to find information regarding it I'm starting to believe it's not as ideal as it first seems. Thanks in advanance.

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  • TIF opens via IE, but not within a page

    - by tsilb
    I have a picture: http://www.kconnolly.net/Gallery/Panoramas/Mountainscapes/DSCN2049_stitch_sm.tif Which loads fine when I paste it into my address bar. However, when I embed it within a Page, I get a broken image icon. However, all browsers treat it as a download. Conversely, this image, which was made the same way, works fine when I embed it within a Page. Browsers treat this as a Document and not as a Download: http://www.kconnolly.net/Gallery/Panoramas/Mountainscapes/DSCN2060_stitch_sm.tif Why is that?

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  • Windows XP volume control spontaneously slides to zero

    - by Paul Dixon
    Was listening to a podcast in iTunes at my desk, left my desk briefly and as I sat down, the volume faded. If I scrolled the volume back up, using my keyboard or the volume tray icon, it would smoothly scroll back down again. I rebooted, same thing occurred. Figuring maybe I had a stuck keyboard or hitherto undiscovered mouse function, I unplugged each in turn. Volume still wanted to go to zero! Anyone know what might cause this? It's driving me nuts!

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  • Thinkpad speaker turns mute - Linux Codec issue?

    - by Curlew
    At some point a few days ago the speakers on my Lenovo Thinkpad T410 (Model number: 2537A11) suddenly stopped working randomly. This error happens every time I watch a video or listen to a music file. The sound just abruptly stops. At the moment, I can't produce a single sound no matter what I do. I am using Debian GNU/Linux on this laptop and there doesn't appear to be anything else wrong (the fan is working, no abnormal heat (staying around ~40°C), no other obvious errors or problems). Here is the output of a nice program someone pointed me to: martin@martin:~/Downloads$ sudo python run.py --monitor Using temporary directory: /dev/shm/hda-analyzer You may remove this directory when finished or if you like to download the most recent copy of hda-analyzer tool. Downloading file hda_analyzer.py Downloading file hda_guilib.py Downloading file hda_codec.py Downloading file hda_proc.py Downloading file hda_graph.py Downloading file hda_mixer.py Downloaded all files, executing hda_analyzer.py Watching 1 cards ====================================== Sound is working normally and then it stops and the following lines appear: Diff for codec 0/0 (0x14f15069): --- +++ @@ -164,17 +164,17 @@ Power: setting=D0, actual=D0 Node 0x1f [Pin Complex] wcaps 0x400501: Stereo Pincap 0x00000010: OUT Pin Default 0x901701f0: [Fixed] Speaker at Int N/A Conn = Analog, Color = Unknown DefAssociation = 0xf, Sequence = 0x0 Misc = NO_PRESENCE Pin-ctls: 0x40: OUT - Power: setting=D0, actual=D0 + Power: setting=D3, actual=D3 Connection: 2 0x10* 0x11 Node 0x20 [Pin Complex] wcaps 0x400781: Stereo Digital Pincap 0x00000010: OUT Pin Default 0x40f001f0: [N/A] Other at Ext N/A Conn = Unknown, Color = Unknown DefAssociation = 0xf, Sequence = 0x0 Misc = NO_PRESENCE And now there is also an error in the dmesg output hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. I changed the bdl_pos_adj to various numbers (-1, 0, 64, 1024) and either there is no change at all or dmesg reports that the adjustment is too big. I wonder if this bdl_pos_adj is the real reason for the error. Here is my hardware information provided by alsa-info.sh website. Okay, i did some serious testing and even installed Windows and now i officially conclude that this is a hard-ware related issue with my Laptop speakers. Reason: The error occurs in my installed Debian Linux, an Ubuntu Live distribution and Windows XP No error-message appears in all of the OS. The sound just keeps running and i can't hear a thing. I tested different setups, including OSS, ALSA and the pulseaudio server on top If i use my new usb-headphones i can hear sound all the time without any sudden silences. So obviously, although hard to believe, my laptop speakers are not okay (never heard of similar cases). I'll award the bounty to anyone who can point me to good tutorials or the procedure how to exchange my T410 speakers (i still have warranty. The laptop was bought in Germany, but now i am in Denmark). Or to someone who can explain me the output from hda-analyzer (big log above).

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  • I have static noise in my speakers and headset

    - by Kazarion
    I have been having a problem with my computer where I am constantly getting static from the point I turn on my PC. I have changed Towers, Hard Drives, added and removed a Sound Blaster Xtreme Sound Card, used 3 different Headsets, and 2 sets of speakers. Lately I have noticed random dips in my frame rates when playing games. Is there any possibility that the graphics card could be causing the static with the possibility of it needing to go in for repairs? Specs: i5-3570K 3.40 GHZ Gigabyte GTX 570 8GB of Corsair Ram MB ASUS|P8Z77-V Z77 3TB Seagate Barracude HDD Rosewill 850W PSU Corsair A70 Heatsink

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  • ffmpeg volume parameter format

    - by tanon
    ffmpeg's -vol parameter is confusing me. 256 => normal (i guess meaning same as input volume, no change) 512 => (double the volume - read this somewhere). So what to do for 3 times the volume? 1.5 times the volume? Basically, lets say I have the max sound amplitudes (audacity levels) in 3 files as: 0.8 0.6 0.9 I want to amplify in the first two files, so that max=0.9 in all files. What parameters of -vol I would use?

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  • How to play WAV file through Network Paging Interface

    - by BGM
    In our building we have a Viking Paging ZPI-4 Interface for our intercom. The interface receives data from our Asterisk Phone system via a Cisco SPA112 Port Adapter which has it's own IP address on the network and converts digital into analog. Asterisk plays the "5" tone and then allows the user's voice to commence over the connection. Now, what I want to do is to play a wav file over this Viking Paging device using the Cisco Port Adapter. I know how to get Asterisk to do it, but I want to do this without Asterisk. I want some kind of program that can talk to the Cisco Port Adapter and then transmit the wav file into the Viking Paging Device. What kind of program do I need to get or make? Now, I found this link if it helps anyone with ideas. I also found this information, but I'm not sure how to apply it. I also found this, but it involves an arduino. However, I already have the analog-to-digital convertor, and the Viking will handle sending sound over the paging speakers. I just need to know how to send the wav file to the Viking via the Port Adapter. So far, I know my wav file should be formatted as 8bit mono, and I need to send the "5" tone to open the Viking Pager's channel. [update] I am trying to figure out if I can use VLC player to stream to the ipaddress of the Port Adapter. So far I'm not having success with that, and don't even know if it will work. Windows Media Player has a streaming option too. I am thinking that since the Cisco Port Adapter thinks it is a sort of phone, that the only way this can be done is via SIP.

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