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• poor performance when deleteing many files

  - by choppy

  I've got two machines: The first is IBM Blade with 24 cores 96GB RAM and single local hard drive with 278GB divided to 4 partitions: 1. c: - 40GB; 3GB free 2. d: - 40GB; 37GB free 3. e: - 198322GB; 198.1 free 4. 100MB (EFI system Partition) Formatted with GPT The other is pizza server with 4 cores 8GB RAM and single local hard drive with 273GB divided to 3 partitions: 1. c: - 136.81; 20GB free 2. d: - 88.74GB; 87.91 free 3. e: - 47.85GB; 46.91 free Formatted with MBR I have two scripts, the first creates 20,000 files in one directory, each file size is 192KB, the second delete the folder (recursive) and prints how much time it toke to delete all files. The problem is on the first server (blade) it takes about 2 minutes to delete all 20,000 files while on the second (pizza) it takes about 4 seconds!? Both servers have clean windows server 2008R2 with no special application running on background. Any ideas what is going on?

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• Automatically change aspect ratio of WMC videos

  - by NeverwaY

  is there a way to automatically change the aspect ratio flag of a video so that it displays in 16:9 in all video players WITHOUT reencode? Quality loss is not a concern. I just need a quick and efficient way to convert several video files to 16:9 as quickly as possible. For instance, older tv show series. I use a plasma tv for my media center, and do not want black bars burnt into my screen when people that dont understand how to use the zoom function in WMC7 watch tv all day. thanks.

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• approximating log10[x^k0 + k1]

  - by Yale Zhang

  Greetings. I'm trying to approximate the function Log10[x^k0 + k1], where .21 < k0 < 21, 0 < k1 < ~2000, and x is integer < 2^14. k0 & k1 are constant. For practical purposes, you can assume k0 = 2.12, k1 = 2660. The desired accuracy is 5*10^-4 relative error. This function is virtually identical to Log[x], except near 0, where it differs a lot. I already have came up with a SIMD implementation that is ~1.15x faster than a simple lookup table, but would like to improve it if possible, which I think is very hard due to lack of efficient instructions. My SIMD implementation uses 16bit fixed point arithmetic to evaluate a 3rd degree polynomial (I use least squares fit). The polynomial uses different coefficients for different input ranges. There are 8 ranges, and range i spans (64)2^i to (64)2^(i + 1). The rational behind this is the derivatives of Log[x] drop rapidly with x, meaning a polynomial will fit it more accurately since polynomials are an exact fit for functions that have a derivative of 0 beyond a certain order. SIMD table lookups are done very efficiently with a single _mm_shuffle_epi8(). I use SSE's float to int conversion to get the exponent and significand used for the fixed point approximation. I also software pipelined the loop to get ~1.25x speedup, so further code optimizations are probably unlikely. What I'm asking is if there's a more efficient approximation at a higher level? For example: Can this function be decomposed into functions with a limited domain like log2((2^x) * significand) = x + log2(significand) hence eliminating the need to deal with different ranges (table lookups). The main problem I think is adding the k1 term kills all those nice log properties that we know and love, making it not possible. Or is it? Iterative method? don't think so because the Newton method for log[x] is already a complicated expression Exploiting locality of neighboring pixels? - if the range of the 8 inputs fall in the same approximation range, then I can look up a single coefficient, instead of looking up separate coefficients for each element. Thus, I can use this as a fast common case, and use a slower, general code path when it isn't. But for my data, the range needs to be ~2000 before this property hold 70% of the time, which doesn't seem to make this method competitive. Please, give me some opinion, especially if you're an applied mathematician, even if you say it can't be done. Thanks.

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• How to download a url as a file?

  - by Michelle

  A website url has "hidden" some mp3 files by embedding them as shockwave files, as follows: <span class="caption"><!-- Odeo player --><embed src="http://odeo.com/flash/audio_player_tiny_gray.swf"quality="high" name="audio_player_tiny_gray" align="middle" allowScriptAccess="always" wmode="transparent" type="application/x-shockwave-flash" flashvars="valid_sample_rate=true external_url=http://podcast.cbc.ca/mp3/sundayeditionstream_20081125_9524.mp3" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></span> How can I download the files for off-line listening? I've found two methods: 1. The StackOverflow Method Create a new local html file with just the links eg <a href="http://podcast.cbc.ca/mp3/sundayeditionstream_20081125_9524.mp3">Sunday Edition 25Nov2008</a> Open the file in the browser, right click the link and File Save Link As. 2. The SuperUser Method Install the Firefox addin Iget. (Be sure to use the right version for your Firefox version.) Tools Downloads Enter url in field. Are there any other ways?

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• Tool to bulk speed up/convert an audio file

  - by User1

  I want to listen to certain podcasts on my phone but I have two common problems: The audio is in some weird format (some don't play on my phone). The audio is slow. I want to use something like sox or avconv to bulk convert the files. Since this is just voice and going on a cell phone, small low-quality files would be best for me. I had some good success using avconv: avconv -i weird.wma normal.ogg Unforunately, this command creates an enormous ogg file and I can't get it play faster. Ideally, this particular file would play at 170% of the original speed.

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• Cheap, light, small Skype laptop?

  - by roufamatic

  My wife and son are heading out while I stay home to babysit some contractors. We discussed getting her a small, cheap laptop that would primarily be used for Skype. Good quality integrated video & mike are prerequisites, as is Windows (though I'd entertain OSX). Doesn't need to be large, a 12" screen is probably fine. If I went new, where should I look? And if I were going to test the used/craigslist waters, what specs are we talking about?

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• Local dedicated hosting space (own hardware)

  - by Scott

  Where can I find local dedicated hosting space for my own hardware? I know I can rent dedicated hosting from various companies online, but usually I think that means I'm renting their hardware too. I just need a space with a network connection and a power outlet. That's it. How much would this cost? What would I search for? Is it available easily? Or would it only be the sort of thing huge companies would do? I'm in the greater NYC area. It's for a project I'm working on, but the thing's loud and annoying. I'd be willing to pay a little to get it out of sight and out of mind. I don't even care too much about the quality of the network connection. I'd rather not rent other people's hardware cause it probably would cost a fortune to rent a machine like this (tons of ram).

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• How to send Bluetooth audio to non-Bluetooth speakers?

  - by wonsungi

  In short, I am looking for a Bluetooth-3.5 mini stereo converter. What is this type of device called, and what are some of the best models (is there a difference in audio quality/lag)? I wish to connect some speakers (Altec Lansing inMotion IM7), which does not support Bluetooth, to my laptop (Lenovo X301) wirelessly. Currently, I can connect my laptop's headphone jack to the AUX jack on my speakers via a mini stereo cable. How do I replace this cable with some type of Bluetooth setup? I am not sure what this Bluetooth device is called. I thought I found something, but it actually does the opposite of what I need (3.5 mini stereo-Bluetooth). (My OS is Vista Enterprise, if that matters)

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• tool for advanced ID3 tags handling and audio files ordering

  - by Juhele

  I have following problem – some of my files do not have complete ID3 tags and some have typos or small differences in writing - so finally, my portable player sees “Mr. President” as different artist from “Mr President” and so on. I would need some tool which could search similar tags and then allow me to correct the typos or for example override “artist” in all selected files by manually entered text. The same with empty tag items – sometimes, the track name, album etc. is OK, but artist is missing etc. Without touching the audio quality, of course (but this should be no problem, I think). I already tried tools in Winamp, Songbird and other players and currently most advanced free tool I tried is Tagscanner. However, it is not able to to solve the problem with similar tags. Do you know such tool? Preferably free and for Windows, if possible. However, if you know some commercial app able to do this, please let me know.

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• What version of Windows Server 2008 to Get

  - by dragonmantank

  One of the projects I'm working on is looking like we're going to need to migrate from CentOS 5.4 over to something else (we need to run Postgresql 8.3+, and CentOS/RHEL only support 8.1), and one of the options will be Windows Server. Since 2008 R2 is out that's what I'm looking at. I'll need to run Postgres and Tomcat and don't really require anything that Windows has like IIS (if I can run Server Core, even better!). The other kicker is it will be virtualized through VMWare ESXI 4.0 so that we have three separate boxes: development, Quality, and Production servers. From a licensing standpoint though, and I good enough with just the Web Server edition? Am I right in assuming that will be three licenses? Or should I just jump up to Enterprise so that I get 4 VM licenses?

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• Tools to automate recording streaming radio

  - by Stan

  Are there any tools that can automate recording online streaming radio? I've been using Total Recorder which has the following useful features: Handy scheduler Supports creating recording templates, so I can customize some high/low quality recording Unfortunately it requires opening the streaming radio in a browser and can't have another sound source at the same time; it's recording what comes out from the speaker. What I am looking for is given an online radio URL, the tool should be able to record the audio stream, no matter if I am playing any other music or not. Does such a tool exist?

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• Best Configuration For Youtube HD 720p

  - by Eray Alakese

  Hello, I'm recording a screencast with CamStudio . My computer's screen resolution is 1280*800 , so video's resolution is 1280*800, too. I'm using Microsoft Video 1 codec when recording. I was record 9 minutes video and this video's size is 214 MB . I will upload this video to Youtube. I'm coding a web site at the video, because of this, video must be quality (720p) . I want to reduce file's size, before upload . I'm using Total Video Converter . But when i convert to FLV , video's size increase to 250MB :) I don't know, how can i configure this setting and which file type should i choose.

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• Best Configuration For Youtube HD 720p

  - by Eray Alakese

  Hello, I'm recording a screencast with CamStudio (http://camstudio.org/) . My computer's screen resolution is 1280*800 , so video's resolution is 1280*800, too. I'm using Microsoft Video 1 codec when recording. I was record 9 minutes video and this video's size is 214 MB . I will upload this video to Youtube. I'm coding a web site at the video, because of this, video must be quality (720p) . I want to reduce file's size, before upload . I'm using Total Video Converter (http://www.effectmatrix.com/total-video-converter/) . But when i convert to FLV , video's size increase to 250MB :) I don't know, how can i configure this setting and which file type should i choose. (screenshot here : http://i.imgur.com/Se0EP.jpg )

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• How do I do distributed UML development (à la FOSS)?

  - by James A. Rosen

  I have a UML project (built in IBM's Rational System Architect/Modeler, so stored in their XML format) that has grown quite large. Additionally, it now contains several pieces that other groups would like to re-use. I come from a software development (especially FOSS) background, and am trying to understand how to use that as an analogy here. The problem I am grappling with is similar to the Fragile Base Class problem. Let me start with how it works in an object-oriented (say, Java or Ruby) FOSS ecosystem: Group 1 publishes some "core" package, say "net/smtp version 1.0" Group 2 includes Group 1's net/smtp 1.0 package in the vendor library of their software project At some point, Group 1 creates a new 2.0 branch of net/smtp that breaks backwards compatibility (say, it removes an old class or method, or moves a class from one package to another). They tell users of the 1.0 version that it will be deprecated in one year. Group 2, when they have the time, updates to net/smtp 2.0. When they drop in the new package, their compiler (or test suite, for Ruby) tells them about the incompatibility. They do have to make some manual changes, but all of the changes are in the code, in plain text, a medium with which they are quite familiar. Plus, they can often use their IDE's (or text editor's) "global-search-and-replace" function once they figure out what the fixes are. When we try to apply this model to UML in RSA, we run into some problems. RSA supports some fairly powerful refactorings, but they seem to only work if you have write access to all of the pieces. If I rename a class in one package, RSA can rename the references, but only at the same time. It's very difficult to look at the underlying source (the XML) and figure out what's broken. To fix such a problem in the RSA editor itself means tons of clicking on things -- there is no good equivalent of "global-search-and-replace," at least not after an incomplete refactor. They real sticking point seems to be that RSA assumes that you want to do all your editing using their GUI, but that makes certain operations prohibitively difficult. Does anyone have examples of open-source UML projects that have overcome this problem? What strategies do they use for communicating changes?

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• How to find the next generated value for a auto-increment column?

  - by Tim Büthe

  I face some trouble with IBM DB2's auto-increment columns. At first, all my columns were defined as GENERATED ALWAYS, but since I had trouble with this when using the "db2 import ..." command, I changed them to GENERATED BY DEFAULT. This is necessary, sinceI need the IDs to be consistent, because other tables reference them. So using "db2 import ... modified by identityignore ..." isn't an option. When I now import data, the IDs are inserted correctly, but everytime I do this, I have to remember to set a new start for the auto-increment column by getting the highest Id+1 and alter the column like this: SELECT MAX(mycolumn)+ 1 FROM mytable; ALTER TABLE mytable ALTER COLUMN mycolumn RESTART WITH <above_result>; If I forget this, an Insert-Statement will fail with an duplicate PK error, since the auto-increment column is the primary key. So my question is: Is there a way to find the next value for an auto-increment column, so I could write Statements that would check, if this value is less then the SELECT MAX and needs to be set? Or: Isn't this whole thing as complicated as it seems to me? Could I somehow import data, preserving the IDs and have the auto-increment column still working as expected?

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• How to configure network on Windows Server 2008

  - by Gokhan Ozturk

  I have a IBM x3400 Server Machine with Windows Server 2008 R2 installed on it. But, since I am not expert on networking I have some problems. These roles installed on my server: Active Directory DNS File Sharing Hyper-V ISS VPN There is two network card on them. I configured them like this: Local Connection 1: 192.168.30.3 255.255.255.0 192.168.30.2 127.0.0.1 Local Connection 2: 192.168.30.101 255.255.255.0 192.168.30.6 127.0.0.1 My problem is, when I use this Ip gateways, It is sharing internet to all computers. This is not I want. I want to use Local Connection 1 for internal network. I am giving all computers gateway and DNS IP as 192.168.30.3 The Local Connection 2 is for Hyper-V and VPN connections. 192.168.30.2 and 192.168.30.6 are my modem's gateways. I am using 192.168.30.6 external IP for VPN connections. There is two 24 port switches. There is a connection between them and this two ethernet card connected directly to them. And modems are connected to switches as well (Morems are not near the server. They are somewhere in the building). I disabled network Bridge and removed all ethernet cards from it. With this configuration, all computers can ping my server's IP (192.168.30.3) but on server I cannot ping any clients (Request timeout). What is the best way to configure my network? Thank you. Redgards

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• How to implement a virtual server running Ubuntu inside a fileserver in windows?

  - by user541445

  I work in a company that has some limitations regarding their budget. They need client/server aplication. I can code the aplication, I've made mini tests on primordial applications that work. The thing is that they only have fileservers, and the application they need must be concurrent compliant, so the database must be in their local network (Fileserver is the only choice). So far, I have explored almost any option available, starting with: Desktop databases. Access (We have a license)(But concurreny is just not effective, besides it's a windows software, yuck). Sqlite (Nice, but since the information they manage is a lot, I've performed some concurrency tests with INSERTs and doing SELECTS at the same time). It fails, somehow it just stops inserting. Open office Base (I dismember a base office only to see that it was a file mode HSQLDB). I've tried, not concurrent at all. Etc (You name the Open source Desktop Database manager, and yes, I've tried that one.) Server databases Call me a stubborn person, but reading some server databases documentation say that their databases will work in a file mode. I've tried a lot of products. Postgres, MySQL, FireBird, H2, Derby, Oracle Express, IBM DB2 Express, etc. So, I really need a hand here, I've been doing this install/delete/depression thing with a lot of databases for 3 weeks, until I got with a crazy idea and I just came here to express it. So, my question comes down to this: Installing a light virtual OS software like Virtual PC and then installing in there a Server OS like an Ubuntu server inside that virtual software will work? Will it work 24/7 or when I close the virtual pc software? Will this work in a fileserver? Any suggestion, answer, critic to the place I work, crazy new concurrent database that will work in fileserver will be most than welcome.

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• Advanced ID3 tags handling and audio files ordering

  - by Juhele

  Some of my files do not have complete ID3 tags and some have typos or small differences in writing – so finally, my portable player sees “Mr. President” as different artist from “Mr President” and so on. I would need some tool which could search similar tags and then allow me to correct the typos or for example override artist in all selected files by manually entered text. The same with empty tag items – sometimes, the track name, album etc. is OK, but the artist is missing etc. I'd like to do this without touching the audio quality, of course (but this should be no problem, I think). I already tried tools like: Winamp Songbird other players Tagscanner – the most advanced free tool I tried. However, it is not able to to solve the problem with similar tags. Do you know such tool? Preferably free and for Windows, if possible. However, if you know some commercial app able to do this, please let me know.

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• Rolling desktop recorder?

  - by lance

  I want a piece of software that will constantly record what I'm doing on my desktop, discarding footage that's over [30] seconds old. Its recording would be a rolling one. The idea is that I can somehow hit a button and see "what just happened". I don't want to have to babysit it. That is, I don't want a piece of software designed for screencasting (which I'm not trying to do). My bias against that is based on my (maybe incorrect?) assumption that I'd regularly have to start/stop the recording throughout the day. The idea is that this piece of software would consume fewer resources (than a screencast recorder) on my box, as it's only keeping a very limited amount of footage in memory (and low quality would even be acceptable), because it's discarding frames fairly quickly after they're captured. Where can I find a piece of software with features like this?

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• Has anyone tried the "Secret LCD Monitor" hack? [closed]

  - by cornjuliox

  I'm genuinely curious to know, has anyone tried this hack? I can get LCD monitors for cheap at a place near where I live, and I'd like to try it myself, but I'd like to get more info on it before I do so to increase my chances of success. I'm looking for more info on the entire process, especially about any solvents I can use should I run into any glue problems. Questions for anyone that HAS tried it: Does it actually work, or is this some gag? If it works, is there any decrease in image quality or viewing angles? Since the polarization filters are essentially stuck to glasses, does that mean you're going to have to sit directly in front of the monitor at all times, and any shift in your position means that you won't be able to see the image? Does it improve/worsen ghosting or other LCD artifacts? Are there any problems with eye strain?

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• How to keep source frame rate with mencoder/ffmpeg?

  - by Sandra

  I would like to crop and rotate a video, and then encode it to mp4 or mkv. mencoder video.mp4 -vf rotate=1,crop=720:1280:0:0 -oac pcm -ovc x264 -x264encopts preset=veryslow:tune=film:crf=15:frameref=15:fast_pskip=0:threads=auto -lavfopts format=matroska -o test.mkv But when I do the above encoding, the frame rate is way too fast. The encoding options were something I found, so I don't know if that is the problem. Question All I want is to crop and rotate the video, and keep the audio/video quality as good as possible. Have anyone tried this?

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• Do 24pin motherboard wires have to be in a certain order?

  - by jasondavis

  I am wanting to sleeve all the wires in my new PC. On my 24pin motherboard connection cable, I must remove the end plastic connector piece from all the wires to sleeve them all individually. I have a couple questions about this cable though. 1) When I put all the wires back into the connector, must they be in the same order they are in now? 2) I have taken a low quality iphone photo below so you cannot see to well, but in a couple spots I marked with arrows, there is actually 2 wires going into a single slot. I am not sure what to do with those, do all 24pin motherboard connectors have some slots where 2 wires go in like that?

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• Will this RAM work well in an iMac?

  - by sala_7

  I want to increase the RAM of my 2.4GHz Intel Core 2 Duo 24" iMac. I currently have 1GB of RAM DDR2 SDRAM 667 MHz. I really want to upgrade, but know nothing about RAM or hardware in general... These are the cards I found: http://www.crucial.com/eu/store/mpartspecs.aspx?mtbpoid=D4B6F603A5CA7304 Are these of quality or should I look at something else? Finally, I have 800MHz of Bus speed, couldn't I get faster RAM? Thanks for taking the time to read, and hoping you take the time to answer.

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• What are good and bad jitter times for a LAN

  - by garyb32234234

  Ive just ran jperf (frontend to iperf) on our network between 2 workstations, its recorded jitter between 0.033ms and 0.048ms. Is this good or bad? Are there more variables that i would need to consider to make the decision? EDIT: TCP/IP Ethernet LAN 43 PCs 1 server, 100Mbits main switch, various small 8 port switches, test was done using UDP, Its a Windows Domain. I want to instal a few voip softphones on the workstations, see how many i can use that reliably work, im testing a few different workstations around the network to see where the best quality network paths are. Will also change some equipment if i identify bad connections.

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• LAME: Switch sample rate of file without reencoding?

  - by TK Kocheran

  Is it possible to resample an MP3 file to a different rate (44.1) without doing a reencode? I have a few MP3 files that are at 48 and I need to switch 'em to 44.1, and I don't want to have to reencode my files to do so, as I'll lose quality. The source files are at CBR 320 and at 48kHz. Can this be done? The current way I'm doing it is using the following command: lame -b 320 -q 0 --resample 44.1 input.mp3 output.mp3 Is there a better way to do this?

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