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• CentOS - massive usage on loopback interface

  - by Matthew Iselin

  Hi, I have a CentOS installation which is running fairly smoothly. Today I ran ifconfig mainly to see what sort of usage has been coming across the ethernet interface, and to also check my link speed. This is what I ended up seeing for the loopback device: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:10301085132061223274 errors:0 dropped:0 overruns:0 frame:0 TX packets:13981054163812689233 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:11783901785008000095 (0.6 EiB) TX bytes:10333501021200548281 (0.9 EiB) This just feels completely wrong - almost an EiB of data? Any assistance in tracking down the source of these statistics would be greatly appreciated.

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• Software for mosaicing video frames into a panorama

  - by Eikern

  I have some video footage I've shot using a dolly with the camera rotated 90 degrees to the right. Which gives me a sideways tracking shot of a background. Does there exist some kind of software I can create a single image from the video footage? The result I want is one single image of the entire shot. I guess I could export every Nth frame and use Photoshop (or any other type of panorama software) to merge the images together, but this would make it easier. Thanks.

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• Convert png sequence to x264 with ffmpeg

  - by Thucydides411

  I am trying to convert a series of pngs into an mp4 video. I am using ffmpeg, and want to encode the video with the x264 codec. Using the command ffmpeg -y -r 30 -b 1800k -i _tmp%04d.png -vcodec libx264 out.mp4 I get the following warning message Incompatible pixel format 'bgra' for codec 'libx264', auto-selecting format 'yuv420p' My understanding is that there is an alpha channel in the pngs, which the x264 encoder cannot handle. Is there a way to get around this problem? Is there, for example, a way to get the encoder to ignore the alpha channel (my pngs don't actually have any transparent elements)? I'm aware that I could batch convert the pngs beforehand to strip the alpha channel, but the sequence of images is produced by another program, and having to preprocess the images each time I make a video would be less than optimal. Edit: After stripping the alpha channel from each frame using the command convert in.png -background white -flatten +matte out.png ffmpeg gives the warning message Incompatible pixel format 'pal8' for codec 'libx264', auto-selecting format 'yuv420p' so still no dice.

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• Allow Incoming Responses Apache. On Ubuntu 11.10 - Curl

  - by Daniel Adarve

  I'm trying to get a Curl Response from an outside server, however I noticed I cant neither PING the server in question nor connect to it. I tried disabling the iptables firewall but I had no success. My server is running behind a Cisco Linksys WRTN310N Router with the DD-wrt firmware Installed. In which I already disabled the firewall. Here are my network settings: Ifconfig eth0 Link encap:Ethernet HWaddr 00:26:b9:76:73:6b inet addr:192.168.1.120 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::226:b9ff:fe76:736b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:49713 errors:0 dropped:0 overruns:0 frame:0 TX packets:30987 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:52829022 (52.8 MB) TX bytes:5438223 (5.4 MB) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:341 errors:0 dropped:0 overruns:0 frame:0 TX packets:341 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:27604 (27.6 KB) TX bytes:27604 (27.6 KB) /etc/resolv.conf nameserver 192.168.1.1 /etc/nsswitch.com passwd: compat group: compat shadow: compat hosts: files dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis /etc/host.conf order hosts,bind multi on /etc/hosts 127.0.0.1 localhost 127.0.0.1 callcenter # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters /etc/network/interfaces # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 192.168.1.120 netmask 255.255.255.0 network 192.168.1.1 broadcast 192.168.1.255 gateway 192.168.1.1 The Url to which im trying to get a connection to is https://www.veripayment.com/integration/index.php When I ping it on terminal heres what I get daniel@callcenter:~$ ping https://www.veripayment.com/integration/index.php ping: unknown host https://www.veripayment.com/integration/index.php daniel@callcenter:~$ ping www.veripayment.com PING www.veripayment.com (69.172.200.5) 56(84) bytes of data. --- www.veripayment.com ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1007ms PHP Function in codeigniter public function authorizePayment(){ //--------------------------------------------------- // Authorize a payment //--------------------------------------------------- // Get variables from POST array $post_str = "action=payment&business=" .urlencode($this->input->post('business')) ."&vericode=" .urlencode($this->input->post('vericode')) ."&item_name=" .urlencode($this->input->post('item_name')) ."&item_code=" .urlencode($this->input->post('item_code')) ."&quantity=" .urlencode($this->input->post('quantity')) ."&amount=" .urlencode($this->input->post('amount')) ."&cc_type=" .urlencode($this->input->post('cc_type')) ."&cc_number=" .urlencode($this->input->post('cc_number')) ."&cc_expdate=" .urlencode($this->input->post('cc_expdate_year')).urlencode($this->input->post('cc_expdate_month')) ."&cc_security_code=" .urlencode($this->input->post('cc_security_code')) ."&shipment=" .urlencode($this->input->post('shipment')) ."&first_name=" .urlencode($this->input->post('first_name')) ."&last_name=" .urlencode($this->input->post('last_name')) ."&address=" .urlencode($this->input->post('address')) ."&city=" .urlencode($this->input->post('city')) ."&state_or_province=" .urlencode($this->input->post('state_or_province')) ."&zip_or_postal_code=" .urlencode($this->input->post('zip_or_postal_code')) ."&country=" .urlencode($this->input->post('country')) ."&shipping_address=" .urlencode($this->input->post('shipping_address')) ."&shipping_city=" .urlencode($this->input->post('shipping_city')) ."&shipping_state_or_province=" .urlencode($this->input->post('shipping_state_or_province')) ."&shipping_zip_or_postal_code=".urlencode($this->input->post('shipping_zip_or_postal_code')) ."&shipping_country=" .urlencode($this->input->post('shipping_country')) ."&phone=" .urlencode($this->input->post('phone')) ."&email=" .urlencode($this->input->post('email')) ."&ip_address=" .urlencode($this->input->post('ip_address')) ."&website_unique_id=" .urlencode($this->input->post('website_unique_id')); // Send URL string via CURL $backendUrl = "https://www.veripayment.com/integration/index.php"; $this->curl->create($backendUrl); $this->curl->post($post_str); $return = $this->curl->execute(); $result = array(); // Explode array where blanks are found $resparray = explode(' ', $return); if ($resparray) { // save results into an array foreach ($resparray as $resp) { $keyvalue = explode('=', $resp); if(isset($keyvalue[1])){ $result[$keyvalue[0]] = str_replace('"', '', $keyvalue[1]); } } } return $result; } This gets an empty result array. This function however works well in the previous server where the script was hosted before. No modifications where made whatsoever Thanks in Advance

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• Streaming flash video does not work on my Mac OS X

  - by dehmann

  Flash videos do not work properly on my Mac. On this Vimeo video, for example, it shows only the beginning frame, and audio stutters like crazy, playing audio for a quarter second or so, then silence, then playing again, etc. I have Flash version 10,0,42,34 on Mac OS 10.5.8. It's a PowerBook G4 (PPC). I tried it in Firefox 3.5.5 and Safari 4.0.3. I tried reinstalling Flash, restarting the computer, and using a fresh user profile in Firefox (so that no extensions are interfering with the site), loading the video fully before playing, but nothing helps. I noticed that youtube videos work better, once loaded enough, although the picture does halt briefly once every 10 or so seconds, even when it's fully loaded.

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• How do I protect business critical data against fire?

  - by Bill Knowles

  We have 72 hard drives that contain our webcast inventory. The number is increasing. We're located in a frame building and we are afraid of not only fire, but catastrophic fire. I've priced fireproof safes that hold to the required 125F for hard drives. Their price is through the roof. Seems to me if we made backups of each of the hard drives and stored them off-site somewhere, or contracted with an online backup storage company, we might run up a bill buying backup drives that would approach the $7,000 cost of the safe! What's the best way to protect our data from the risk of fire?

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• how do I import a targa sequence as a composition in after effects cs4 ?

  - by George Profenza

  I am a complete n00b with After Effects now, but I want to achieve something basic. I have a sequence of TARGA(.tga) files named alphanumerically(name_0000, where 0000 is the frame). I want to import those as a composition. What I'm after is having each .tga file siting in the timeline in sequence. I tried File Import File, selected the first, then selected the last, holding Shift, and ticked sequence, but I cannot select Composition from that Dialog, I can only select Footage and I don't knwow why. Hints ?

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• Options for gaming remotely on a LAN?

  - by Schwern

  I have a Windows 7 desktop for gaming, a big bulky tower with a nice graphics card. I'd like to sit out on my porch rather than inside while the weather is nice and play games. I have a high end Macbook Pro. What are my options? I figure either remote desktop over the LAN on the Macbook or maybe wireless video, keyboard and mouse. Something so I don't have to physically move the PC. The sort of games range from things like Skyrim to SW:TOR to Torchlight 2. What are my options? They have to do a better than running Boot Camp on the Macbook (MacBookPro8,1 i7 2.7 Ghz but Intel Graphics 3000). I realize there's a lot of issues involved in running a game over a remote desktop with a decent frame rate, I'm interested in a practical answer with real experience behind them. Ideally something that works on a OS X so I don't have to reboot into Windows.

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• Round-Robin DNS in mobile networks

  - by k7k0

  After reading load distribution alternatives and giving my limited skills on the area I'm biased toward round-robin DNS strategy. From what I understood, one key aspect of DNS Round-Robin is setting a low TTL value, avoiding caching. My main concern is that all my traffic comes from mobile networks, almost 30% of that comes from t-mobile 3G. Some questions: 1) Is there a chance that almost all clients on the same mobile network will be redirected to the same IP in the TTL frame? That would kill the distribution technique. 2) If I choose a really low TTL (zero or one). That impacts directly over client performance? It does a DNS miss every time or it's a setting that only impacts on DNS servers? Any help would be much appreciated. Thanks

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• Probability of failure with larger number of network elements

  - by MikeKulls

  I'm having a discussion with a work colleague. I'm saying that a network with 100 elements will have pretty much 10 times as many failures as a network with 10 elements, ie a tech will need to replace faulty hardware 10 times more often. He suggests that the failure rate doesn't go up in a linear fashion and the failure rate will be significantly less than 10x, in fact only slightly more failures. This is not the probability of an outage etc, we are just talking in relation to the amount of parts that a tech would need to swap out in a given time frame.

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• How do I get the Dell 3007wfphc monitor to do other resolutions?

  - by Schwern

  I've borrowed a Dell 3007 WFP-HC monitor and it will only do 1280x800 and 2560x1600 resolutions crisply due to its lack of a real scaler. Every other resolution is fuzzy. 1280x800 is pixelated and I doubt my PC can play games at a reasonable frame rate at 2560x1600. Can I get something in between that looks good? I have a GeForce GTX 560 video card and Windows 7. Is it possible to get the GPU to render at a more reasonable resolution, say 1920x1200, and stretch it to the native 2560x1600 to make the monitor happy? I've been poking at the NVIDIA Control Panel but to no effect. Thank you.

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• ObjectContext.SaveChanges() fails with SQL CE

  - by David Veeneman

  I am creating a model-first Entity Framework 4 app that uses SQL CE as its data store. All is well until I call ObjectContext.SaveChanges() to save changes to the entities in the model. At that point, SaveChanges() throws a System.Data.UpdateException, with an inner exception message that reads as follows: Server-generated keys and server-generated values are not supported by SQL Server Compact. I am completely puzzled by this message. Any idea what is going on and how to fix it? Thanks. Here is the Exception dump: System.Data.UpdateException was unhandled Message=An error occurred while updating the entries. See the inner exception for details. Source=System.Data.Entity StackTrace: at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) at System.Data.Objects.ObjectContext.SaveChanges() at FsDocumentationBuilder.ViewModel.Commands.SaveFileCommand.Execute(Object parameter) in D:\Users\dcveeneman\Documents\Visual Studio 2010\Projects\FsDocumentationBuilder\FsDocumentationBuilder\ViewModel\Commands\SaveFileCommand.cs:line 68 at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated) at System.Windows.Controls.Primitives.ButtonBase.OnClick() at System.Windows.Controls.Button.OnClick() at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent) at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted) at System.Windows.Input.InputManager.ProcessStagingArea() at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input) at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport) at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.Run() at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at FsDocumentationBuilder.App.Main() in D:\Users\dcveeneman\Documents\Visual Studio 2010\Projects\FsDocumentationBuilder\FsDocumentationBuilder\obj\x86\Debug\App.g.cs:line 50 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: System.Data.EntityCommandCompilationException Message=An error occurred while preparing the command definition. See the inner exception for details. Source=System.Data.Entity StackTrace: at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary`2 identifierValues) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues) at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) InnerException: System.NotSupportedException Message=Server-generated keys and server-generated values are not supported by SQL Server Compact. Source=System.Data.SqlServerCe.Entity StackTrace: at System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateReturningSql(StringBuilder commandText, DbModificationCommandTree tree, ExpressionTranslator translator, DbExpression returning) at System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateInsertSql(DbInsertCommandTree tree, List`1& parameters, Boolean isLocalProvider) at System.Data.SqlServerCe.SqlGen.SqlGenerator.GenerateSql(DbCommandTree tree, List`1& parameters, CommandType& commandType, Boolean isLocalProvider) at System.Data.SqlServerCe.SqlCeProviderServices.CreateCommand(DbProviderManifest providerManifest, DbCommandTree commandTree) at System.Data.SqlServerCe.SqlCeProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) at System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree) at System.Data.Common.DbProviderServices.CreateCommand(DbCommandTree commandTree) at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree) InnerException:

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• Are animated GIFs supported in Google Chrome?

  - by James Goodwin

  I have recently been testing a website and found animated gif images that seem to show fine in IE and Firefox but in Google Chrome they only show briefly and then dissapear! This happens if I view the image on the page or view the file directly. Are there any reported problems in displaying GIFs in Chrome, or is it just being fussy? There seemed to have been some problems in older versions of Chrome, but it's hard to believe something as simple as this wouldn't have been fixed by now. The version of Google Chrome I am using is: 4.1.249.1021 Not sure if this is relevant, but some info about the image: Width: 216 pixels Height: 36 pixels Horizontal resolution: 96dpi Vertical resolution: 96dpi Bit Depth: 32 Frame Count: 3 EDIT: Seems to be a problem relating to the latest beta version of Chrome, as it works fine in 4.0.249

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• video streaming infrastructure advice

  - by Alchemical

  We would like to set-up a live video-chat web site and are looking for basic recomendations for software and hardware set-up. Most streams will be broadcast live from a single person with a web cam, etc., and viewed by typically 1-10 people, although there could be up to 100+ viewers on the high side. Audio and video do not have to be super-high quality, but do need to be "good enough". The main point is to convey the basic info in the video (and audio). If occasionally the frame-rate drops low and then goes back to normal fairly soon, we could live with that. Budget is an issue, so we are in general looking for a lower cost solution that will give us most of what we need in temers of performance and quality. We are looking at Peer1 for co-lo. The rest of our web site will be .Net / Windows platform. We are open to looking at any platform for the best streaming solution, although our technical expertise is currently more on the Windows side.

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• How to change by using CVGrayscaleMat

  - by Babul

  With the following code the image showed as above is converted as below image... Their it's showing black background with gray lines.....i want white background with gray lines .. Please guide me .. i am new to iPhone Thanks alot in Advance - (void)viewDidLoad { [super viewDidLoad]; // Initialise video capture - only supported on iOS device NOT simulator #if TARGET_IPHONE_SIMULATOR NSLog(@"Video capture is not supported in the simulator"); #else _videoCapture = new cv::VideoCapture; if (!_videoCapture->open(CV_CAP_AVFOUNDATION)) { NSLog(@"Failed to open video camera"); } #endif // Load a test image and demonstrate conversion between UIImage and cv::Mat UIImage *testImage = [UIImage imageNamed:@"testimage.jpg"]; double t; int times = 10; //-------------------------------- // Convert from UIImage to cv::Mat NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { cv::Mat tempMat = [testImage CVMat]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; [pool release]; NSLog(@"UIImage to cv::Mat: %gms", t); //------------------------------------------ // Convert from UIImage to grayscale cv::Mat pool = [[NSAutoreleasePool alloc] init]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { cv::Mat tempMat = [testImage CVGrayscaleMat]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; [pool release]; NSLog(@"UIImage to grayscale cv::Mat: %gms", t); //-------------------------------- // Convert from cv::Mat to UIImage cv::Mat testMat = [testImage CVMat]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { UIImage *tempImage = [[UIImage alloc] initWithCVMat:testMat]; [tempImage release]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; NSLog(@"cv::Mat to UIImage: %gms", t); // Process test image and force update of UI _lastFrame = testMat; [self sliderChanged:nil]; } - (IBAction)capture:(id)sender { if (_videoCapture && _videoCapture->grab()) { (*_videoCapture) >> _lastFrame; [self processFrame]; } else { NSLog(@"Failed to grab frame"); } } - (void)processFrame { double t = (double)cv::getTickCount(); cv::Mat grayFrame, output; // Convert captured frame to grayscale cv::cvtColor(_lastFrame, grayFrame, cv::COLOR_RGB2GRAY); // Perform Canny edge detection using slide values for thresholds cv::Canny(grayFrame, output, _lowSlider.value * kCannyAperture * kCannyAperture, _highSlider.value * kCannyAperture * kCannyAperture, kCannyAperture); t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency(); // Display result self.imageView.image = [UIImage imageWithCVMat:output]; self.elapsedTimeLabel.text = [NSString stringWithFormat:@"%.1fms", t]; }

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• Random flickering on 2.6.32 kernels after suspend

  - by whitequark

  I have XUbuntu 9.10 installed on a Toshiba NB200 netbook with Intel video card that's handled with i915 driver. With 2.6.31 stable, recommended kernel everything but WiFi works fine: Atheros ath9k WiFi shows too small signal power and loses packets in 'bursts' sometimes. With 2.6.32-* (I tested -9 to -11 from Ubuntu's kernel unstable ppa) everything works fine just prior to first suspend: echo mem >/sys/power/state. After it random unidentified fullscreen 'one-frame' flickering begins in Xorg, and after a couple of minutes everything eventually hangs while showing filled grey (not white; it is like default button colour) screen; no X keys are working: Ctrl+Alt+Fn don't, blind typing in console too. Magic SysRq still works and I was able to reboot. Also there is one out-of-tree kernel module called omnibook that is required to turn on WiFi and Bluetooth. Any advices?

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• Windows XP problems displaying internet browser backgrounds correctly

  - by Samurai Waffle

  My friend has a Windows XP computer that doesn't show the colored background on pages, it's always white. On top of that some pictures won't show up, there will just be an empty white frame. Also when you left click on a folder, instead of opening it up, it opens up a new window that turns out to be the search results window. I've never heard of these problems before, and I can't find any information on the internet about it. I assume it's a virus deeply imbedded into the system, but no virus scanner has found it. Thanks for the help!

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• Why are there 3 conflicting OpenCV camera calibration formulas?

  - by John

  I'm having a problem with OpenCV's various parameterization of coordinates used for camera calibration purposes. The problem is that three different sources of information on image distortion formulae apparently give three non-equivalent description of the parameters and equations involved: (1) In their book "Learning OpenCV…" Bradski and Kaehler write regarding lens distortion (page 376): xcorrected = x * ( 1 + k1 * r^2 + k2 * r^4 + k3 * r^6 ) + [ 2 * p1 * x * y + p2 * ( r^2 + 2 * x^2 ) ], ycorrected = y * ( 1 + k1 * r^2 + k2 * r^4 + k3 * r^6 ) + [ p1 * ( r^2 + 2 * y^2 ) + 2 * p2 * x * y ], where r = sqrt( x^2 + y^2 ). Assumably, (x, y) are the coordinates of pixels in the uncorrected captured image corresponding to world-point objects with coordinates (X, Y, Z), camera-frame referenced, for which xcorrected = fx * ( X / Z ) + cx and ycorrected = fy * ( Y / Z ) + cy, where fx, fy, cx, and cy, are the camera's intrinsic parameters. So, having (x, y) from a captured image, we can obtain the desired coordinates ( xcorrected, ycorrected ) to produced an undistorted image of the captured world scene by applying the above first two correction expressions. However... (2) The complication arises as we look at OpenCV 2.0 C Reference entry under the Camera Calibration and 3D Reconstruction section. For ease of comparison we start with all world-point (X, Y, Z) coordinates being expressed with respect to the camera's reference frame, just as in #1. Consequently, the transformation matrix [ R | t ] is of no concern. In the C reference, it is expressed that: x' = X / Z, y' = Y / Z, x'' = x' * ( 1 + k1 * r'^2 + k2 * r'^4 + k3 * r'^6 ) + [ 2 * p1 * x' * y' + p2 * ( r'^2 + 2 * x'^2 ) ], y'' = y' * ( 1 + k1 * r'^2 + k2 * r'^4 + k3 * r'^6 ) + [ p1 * ( r'^2 + 2 * y'^2 ) + 2 * p2 * x' * y' ], where r' = sqrt( x'^2 + y'^2 ), and finally that u = fx * x'' + cx, v = fy * y'' + cy. As one can see these expressions are not equivalent to those presented in #1, with the result that the two sets of corrected coordinates ( xcorrected, ycorrected ) and ( u, v ) are not the same. Why the contradiction? It seems to me the first set makes more sense as I can attach physical meaning to each and every x and y in there, while I find no physical meaning in x' = X / Z and y' = Y / Z when the camera focal length is not exactly 1. Furthermore, one cannot compute x' and y' for we don't know (X, Y, Z). (3) Unfortunately, things get even murkier when we refer to the writings in Intel's Open Source Computer Vision Library Reference Manual's section Lens Distortion (page 6-4), which states in part: "Let ( u, v ) be true pixel image coordinates, that is, coordinates with ideal projection, and ( u ~, v ~ ) be corresponding real observed (distorted) image coordinates. Similarly, ( x, y ) are ideal (distortion-free) and ( x ~, y ~ ) are real (distorted) image physical coordinates. Taking into account two expansion terms gives the following: x ~ = x * ( 1 + k1 * r^2 + k2 * r^4 ) + [ 2 p1 * x * y + p2 * ( r^2 + 2 * x^2 ) ] y ~ = y * ( 1 + k1 * r^2 + k2 * r^4 ] + [ 2 p2 * x * y + p2 * ( r^2 + 2 * y^2 ) ], where r = sqrt( x^2 + y^2 ). ... "Because u ~ = cx + fx * u and v ~ = cy + fy * v , … the resultant system can be rewritten as follows: u ~ = u + ( u – cx ) * [ k1 * r^2 + k2 * r^4 + 2 * p1 * y + p2 * ( r^2 / x + 2 * x ) ] v ~ = v + ( v – cy ) * [ k1 * r^2 + k2 * r^4 + 2 * p2 * x + p1 * ( r^2 / y + 2 * y ) ] The latter relations are used to undistort images from the camera." Well, it would appear that the expressions involving x ~ and y ~ coincided with the two expressions given at the top of this writing involving xcorrected and ycorrected. However, x ~ and y ~ do not refer to corrected coordinates, according to the given description. I don't understand the distinction between the meaning of the coordinates ( x ~, y ~ ) and ( u ~, v ~ ), or for that matter, between the pairs ( x, y ) and ( u, v ). From their descriptions it appears their only distinction is that ( x ~, y ~ ) and ( x, y ) refer to 'physical' coordinates while ( u ~, v ~ ) and ( u, v ) do not. What is this distinction all about? Aren't they all physical coordinates? I'm lost! Thanks for any input!

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• How to get Mac OS X Terminal.app and screen/vim scrolling to play nice?

  - by rustychains

  OSX 10.6.3 Terminal.app Am a pretty dedicated screen user. Terminal.app line buffer and/or scroll does not seem to work for me. That is while in screen anything that goes past the top of the frame is gone, can't scroll back to. This seems to work ok in other terminal apps gnome, cygwin. Perhaps this is a shell env, config, or command? .screenrc: startup_message off autodetach on shell -$SHELL vbell off defutf8 on caption always caption string "%{= wk}%w" I have tried using defscrollback here with different values, but doesn't have an effect. some .bashrc settings: set -o physical export TERM=xterm-color shopt -s checkwinsize

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• Error attempting to log into Redmine through IIS 7.5 Reverse Proxy

  - by dneaster3

  I am trying to set up Redmine as a subdirectory of our department's intranet site, and also to rebrand it as "Workflow" using IIS's URL Rewrite extension. I have it "working" in that it will serve the page with all the correct rewrites in both the URL and the HTML code. However, when I try to submit a form (including logging in to redmine), IIS gives me one of the the following errors: Your browser sent a request that this server could not understand. or The specified CGI application encountered an error and the server terminated the process. Here's the setup: Redmine installed on a local Windows XP machine using the Bitnami all-in-one installer, which includes: Apache 2 Ruby-on-Rails MySQL Redmine Thin Redmine runs locally at http:/localhost/redmine Redmine runs over the intranet http:/146.18.236.xxx/redmine Windows Server + IIS 7.5 serving up an ASP.NET intranet web application mydept.mycompany.com IIS Extensions Url Rewrite and AAR installed Reverse proxy settings for IIS (shown below) to serve Redmine at mydept.mycompany.com/workflow <rewrite> <rules> <rule name="Route requests for workflow to redmine server" stopProcessing="true"> <match url="^workflow/?(.*)" /> <conditions> <add input="{CACHE_URL}" pattern="^(https?)://" /> </conditions> <action type="Rewrite" url="{C:1}://146.18.236.xxx/redmine/{R:1}" logRewrittenUrl="true" /> <serverVariables> <set name="HTTP_ACCEPT_ENCODING" value="" /> <set name="ORIGINAL_HOST" value="{HTTP_HOST}" /> </serverVariables> </rule> </rules> <outboundRules rewriteBeforeCache="true"> <clear /> <preConditions> <preCondition name="isHTML" logicalGrouping="MatchAny"> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" /> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/plain" /> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^application/.*xml" /> </preCondition> <preCondition name="isRedirection"> <add input="{RESPONSE_STATUS}" pattern="3\d\d" /> </preCondition> </preConditions> <rule name="Rewrite outbound relative URLs in tags" preCondition="isHTML"> <match filterByTags="A, Area, Base, Form, Frame, Head, IFrame, Img, Input, Link, Script" pattern="^/redmine/(.*)" /> <action type="Rewrite" value="/workflow/{R:1}" /> </rule> <rule name="Rewrite outbound absolute URLs in tags" preCondition="isHTML"> <match filterByTags="A, Area, Base, Form, Frame, Head, IFrame, Img, Input, Link, Script" pattern="^(https?)://146.18.236.xxx/redmine/(.*)" /> <action type="Rewrite" value="{R:1}://mydept.mycompany.com/workflow/{R:2}" /> </rule> <rule name="Rewrite tags with hypenated properties missed by IIS bug" preCondition="isHTML"> <!-- http://forums.iis.net/t/1200916.aspx --> <match filterByTags="None" customTags="" pattern="(\baction=&quot;|\bsrc=&quot;|\bhref=&quot;)/redmine/(.*?)(&quot;)" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="true" /> <action type="Rewrite" value="{R:1}/workflow/{R:2}{R:3}" /> </rule> <rule name="Rewrite Location Header" preCondition="isRedirection"> <match serverVariable="RESPONSE_LOCATION" pattern="^http://[^/]+/(.*)" /> <conditions> <add input="{ORIGINAL_URL}" pattern=".+" /> <add input="{URL}" pattern="^/(workflow|redmine)/.*" /> </conditions> <action type="Rewrite" value="http://{ORIGINAL_URL}/{C:1}/{R:1}" /> </rule> </outboundRules> </rewrite> <urlCompression dynamicCompressionBeforeCache="false" /> Any help that you can provide would be appreciated. I get the impression that I'm close adn that it is just one little setting here or there, but I can't seem to make it work.

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• How can I register a custom protocol with xdg ?

  - by julien

  I've been struggling this morning trying to associate an application with a custom protocol, namely emacsclient and org-protocol. I'm calling this protocol from a webbrowser bookmarklet, and I get the following behaviour : In chromium, the "Launch Application" dialog comes up, and calls xdg-open org-protocol://... which ends up firing a new chromium frame. In firefox, I've tried setting network.protocol-handler.app.org-protocol to an empty string or my emacsclient path, anyhow I get the following error message : "Firefox doesn't know how to open this address, because the protocol (org-protocol) isn't associated with any program" without even showing any external application selection dialog. I'm not using any desktop environment, so I need to make this work strictly with xdg, however, despite reading the shared mime info spec etc, I still can't fathom a working configuration.

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• How to set parameters of CGContextAddArcToPoint method using a slider

  - by Manish Sahni

  am making an app in which i have to control a smile of a face like graphics. For example if i slide the slider down(to a value less than middle) it should give the arc a sad face(like :-( ) effect and if i slide the slider up the arc should give the effect of smile(like :-) ).initially lips are like :-| . I need to control the lips which is an arc using a slider? smileSliderViewController.h #import <UIKit/UIKit.h> @interface smileSliderViewController : UIViewController { IBOutlet UISlider *slider; } -(IBAction)valueChange:(id)sender; @end smileSliderViewController.m #import "smileSliderViewController.h" //#import "smile.h" @implementation smileSliderViewController -(IBAction)valueChange:(id)sender { int value = (int)(slider.value); if(value>0 && value<25) { //value--; CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetLineWidth(context, 2.0); CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); CGFloat components[] = {0.0,0.0,1.0,1.0}; CGColorRef color = CGColorCreate(colorspace, components); CGContextSetStrokeColorWithColor(context, color); CGContextMoveToPoint(context, 120,180); CGContextAddArcToPoint(context, 190 , 170, 270, 200, 0 ); CGContextStrokePath(context); } } smile.h #import <UIKit/UIKit.h> #import "smile.m" @interface smile : UIView { IBOutlet UISlider *slider; } @end smile.m #import "smile.h" #import "smileSliderViewController.h" @implementation smile - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { // Initialization code } return self; } - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetLineWidth(context, 2.0); //CGContextSetStrokeColor(context, [UIColor redColor].CGColor); CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); CGFloat components[] = {0.0,0.0,1.0,1.0}; CGColorRef color = CGColorCreate(colorspace, components); CGContextSetStrokeColorWithColor(context, color); CGRect rectangle = CGRectMake(60, 20, 200,200); CGContextAddEllipseInRect(context, rectangle); CGContextStrokePath(context); /*CGRect rectangle1 = CGRectMake(130,170,50,10); CGContextAddRect(context,rectangle1); CGContextStrokePath(context);*/ /*CGContextMoveToPoint(context,100,200); CGContextAddArcToPoint(context,120,150,400,150,70 ); CGContextStrokePath(context);*/ /*CGContextMoveToPoint(context, 100,100); CGContextAddArcToPoint(context, -100,200, -400,200, 80); CGContextStrokePath(context);*/ CGContextSetStrokeColorWithColor(context,color); CGRect rectangle2 = CGRectMake(80, 90, 50, 8); CGContextAddEllipseInRect(context, rectangle2); CGContextStrokePath(context); CGContextSetStrokeColorWithColor(context,color); CGRect rectangle3 = CGRectMake(180, 90, 50, 8); CGContextAddEllipseInRect(context, rectangle3); CGContextStrokePath(context); CGContextSetStrokeColorWithColor(context,color); CGContextMoveToPoint(context, 155,120); CGContextAddLineToPoint(context, 155,160); CGContextStrokePath(context); /*CGContextSetStrokeColorWithColor(context, color); CGRect rectangle4 = CGRectMake(130, 180, 50,8); CGContextAddEllipseInRect(context, rectangle4); CGContextStrokePath(context);*/ /*CGContextSetStrokeColorWithColor(context,color); CGContextMoveToPoint(context, 120,180); CGContextAddLineToPoint(context, 190,180); CGContextStrokePath(context);*/ int value = (int)(slider.value); if(value == 25) { CGContextMoveToPoint(context, 120,180); CGContextAddArcToPoint(context, 190 , 180, 250 , 180, 0 ); CGContextStrokePath(context); } }

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• Local Area Connection in Slacware 13

  - by asdasd

  I have windows xp and slackware 13 on one computer, and the ISP provided me a new modem. There was manual how to configure it, so i start the web browser and typed it's ip address 192.168.1.1 and the web interface of the modem appeared so i logged in, that was easy. But under slackware, i don't know how to enter in the modem config / web interface. I type in 192.168.1.1 but it's not working. Here's the output of ifconfig eth0 : eth0 Link encap:Ethernet HWaddr 00:a1:b0:01:18:28 inet addr:169.254.73.8 Bcast:169.254.255.255 Mask:255.255.0.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:17 Memory:febff400-febff4ff How can i log in into the modem from linux, i.e. find it's assigned ip under slackware ? Thank you.

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• Are there videocamera which geotag individual frames?

  - by Grzegorz Adam Hankiewicz

  I'm looking for a way to record live video with the specific requirement of having each frame georeferenced with GPS. Right now I'm using a normal video camera with a PDA+GPS that records the position, but it's difficult to sync both of these plus sometimes I've forgotten to turn the PDA+GPS or it has failed for some reason and all my video has been useless. Using google I found that about two years ago a company named Seero produced such video cameras and software, but apparently the domain doesn't exist any more and I only find references of other pages mentioning it. Does somebody know of any other product? I need to record this video in HD and have some way to export to Google Maps or other GIS software the positions of the frames in a way that I can click on the map and see what was being recorded in the video at that point. The precission of the GPS tracking is good enough as one position per second, intermediate frames of the video stream can be interpolated.

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• Mono-LibreOffice System.TypeLoadException

  - by Marco

  In the past I wrote a C# library to work with OpenOffice and this worked fine both in Windows than under Ubuntu with Mono. Part of this library is published here as accepted answer. In these days I discovered that Ubuntu decided to move to LibreOffice, so I tried my library with LibreOffice latest stable release. While under Windows it's working perfectly, under Linux I receive this error: Unhandled Exception: System.TypeLoadException: A type load exception has occurred. [ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: A type load exception has occurred. Usually Mono tells us which library can't load, so I can install correct package and everything is OK, but in this case I really don't know what's going bad. I'm using Ubuntu oneiric and my library is compiled with Framework 4.0. Under Windows I had to write this into app.config: <?xml version="1.0"?> <configuration> <startup useLegacyV2RuntimeActivationPolicy="true"> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/> </startup> </configuration> because LibreOffice assemblies uses Framework 2.0 (I think). How can I find the reason of this error to solve it? Thanks UPDATE: Even compiling with Framework 2.0 problem (as expected) is the same. Problem (I think) is that Mono is not finding cli-uno-bridge package (installable on previous Ubuntu releases and now marked as superseded), but I cannot be sure. UPDATE 2: I created a test console application referencing cli-uno dlls on Windows (they are registered in GAC_32 and GAC_MSIL). CONSOLE app static void Main(string[] args) { Console.WriteLine("Starting"); string dir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location); string doc = Path.Combine(dir, "Liberatoria siti web.docx"); using (QOpenOffice.OpenOffice oo = new QOpenOffice.OpenOffice()) { if (!oo.Init()) return; oo.Load(doc, true); oo.ExportToPdf(Path.ChangeExtension(doc, ".pdf")); } } LIBRARY: using unoidl.com.sun.star.lang; using unoidl.com.sun.star.uno; using unoidl.com.sun.star.container; using unoidl.com.sun.star.frame; using unoidl.com.sun.star.beans; using unoidl.com.sun.star.view; using unoidl.com.sun.star.document; using System.Collections.Generic; using System.IO; using System; namespace QOpenOffice { class OpenOffice : IDisposable { private XComponentContext context; private XMultiServiceFactory service; private XComponentLoader component; private XComponent doc; public bool Init() { Console.WriteLine("Entering Init()"); try { context = uno.util.Bootstrap.bootstrap(); service = (XMultiServiceFactory)context.getServiceManager(); component = (XComponentLoader)service.createInstance("com.sun.star.frame.Desktop"); XNameContainer filters = (XNameContainer)service.createInstance("com.sun.star.document.FilterFactory"); return true; } catch (System.Exception ex) { Console.WriteLine(ex.Message); if (ex.InnerException != null) Console.WriteLine(ex.InnerException.Message); return false; } } } } but I'm not able to see "Starting" !!! If I comment using(...) on application, I see line on console... so I think it's something wrong in DLL. There I'm not able to see "Entering Init()" message on Init(). Behaviour is the same when LibreOffice is not installed and when it is !!! try..catch block is not executed...

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