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• AS3: How to access pixel data efficiently?

  - by JonoRR

  I'm working a game. The game requires entities to analyse an image and head towards pixels with specific properties (high red channel, etc.) I've looked into Pixel Bender, but this only seems useful for writing new colors to the image. At the moment, even at a low resolution (200x200) just one entity scanning the image slows to 1-2 Frames/second. I'm embedding the image and instance it as a Bitmap as a child of the stage. The 1-2 FPS situation is using BitmapData.getPixel() (on each pixel) with a distance calculation beforehand. I'm wondering if there's any way I can do this more efficiently... My first thought was some sort of spatial partioning coupled with splitting the image up into many smaller pieces. I also feel like Pixel Bender should be able to help somehow, however I've had little experience with it. Cheers for any help. Jonathan

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• iPhone modal view inside another modal view?

  - by Rick

  My App uses a modal view when users add a new foo. The user selects a foo type using this modal view. Depending on what type is selected, the user needs to be asked for more information. I'd like to use another modal view to ask for this extra information. I've tried to create the new modal view like the first one (which works great) and it leads to stack overflow/“Loading Stack Frames” error in Xcode. Am I going about this in completely the wrong way i.e. is this just a really bad idea? Should I rethink the UI itself? UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:addController]; [self presentModalViewController:navigationController animated:YES];

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• FFMPEG based Theora Video Decoder performance??

  - by goldenmean

  Hi, I am in process of porting and optimization of the theora video decoder in the ffmpeg-0.5 package to ARM-Cortex-A8 -Neon processor @ 667 MHz. I am looking for some target estimate for frames per second the decoder library alone should achieve after full optimization (C level and Neon assembly / Intrinsics) for 720x480 Progressive content for a 2Mbps stream. I have a Real Video 9 decoder on cortex-A8 which gives around 40 fps for the same stream above.(720x480, 2Mbps) How can i extrapolate this data based on relative complexities of RV9 and Theora and get a fps estimate for theora decoder Cortex-A8? I am aware the performance depends upon the cache configuration of the h/w, etc...,but any Any pointers will help. Thanks, -AD

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• How to get netstream bytesLoaded and bytesTotal from streaming .mp4?

  - by Amy

  I have a flex 3 app that uses netstream and a video object to stream .mp4 movies. I want to use the bytesLoaded and bytesTotal properties of the netstream to display the buffering information. I would also like to get any information about the number of frames that are dropped if possible. When I've tested on .flv I'm able to get the information without a problem, but it doesn't seem to work on .mp4. Is it possible to get this information streaming .mp4? Is there some configuration that I'm missing to make things work the same for .mp4 as .flv? Thanks!

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• size of view not changing after frame change

  - by MikeNelson

  I have managed to do pretty complex things on iPhone but I am always stuck with views, frames, bounds, and simple stuff that defies any logic and don't work as expected. I have a self.view in my code and it has a lot of subviews on it. At some point of the code, I need to reduce the frame vertically to a specific size and later put it back as before. Then I have this code: [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1.5]; // frame is changing to a newHeight (other parameters are the same as before) self.view.frame = CGRectMake (0, 0, originalWidth, newHeight); [UIView commitAnimations]; The result is simply, nothing. The view continues as before. The same size, the same position. No change. Why this kind of thing happens? how to solve that?

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• Virtual Memory and Paging

  - by Kenshin

  Hello, I am doing some exercices to understand how the virtual memory and paging works, my question is as follows : Suppose we use a paged memory with pages of 1024 bytes, the virtual address space is of 8 pages but the physical memory can only contain 4 frames of pages. Replacement policy is LRU. What is the physical address in main memory that corresponds to virtual address 4096? and how do you get to that result? Same thing as question 1 but with virtual address 1024 A page fault occurs when accessing a word in page 0, which page frame will be used to receive the virtual page 0? Page Image

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• Detecting Infinite recursion in Python or dynamic languages

  - by drozzy

  Recently I tried compiling program something like this with GCC: int f(int i){ if(i<0){ return 0;} return f(i-1); and it ran just fine. When I inspected the stack frames the compiler optimized the program to use only one frame, by just jumping back to the beginning of the function and only replacing the arguments to f. And - the compiler wasn't even running in optimized mode. Now, when I try the same thing in Python - I hit maximum recursion wall (or stack overflow). Is there way that a dynamic language like python can take advantage of these nice optimizations? Maybe it's possible to use a compiler instead of an interpreter to make this work? Just curious!

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• Linux core dumps are too large!

  - by themoondothshine

  Hey guys, Recently I've been noticing an increase in the size of the core dumps generated by my application. Initially, they were just around 5MB in size and contained around 5 stack frames, and now I have core dumps of 2GBs and the information contained within them are no different from the smaller dumps. Is there any way I can control the size of core dumps generated? Shouldn't they be at least smaller than the application binary itself? Binaries are compiled in this way: Compiled in release mode with debug symbols (ie, -g compiler option in GCC). Debug symbols are copied onto a separate file and stripped from the binary. A GNU debug symbols link is added to the binary. At the beginning of the application, there's a call to setrlimit which sets the core limit to infinity -- Is this the problem?

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• Setting WPF image source in code

  - by Torbjørn

  I'm trying to set a WPF image's source in code. The image is embedded as a resource in the project. By looking at examples I've come up with the below code. For some reason it doesn't work - the image does not show up. By debugging I can see that the stream contains the image data. So what's wrong? Assembly asm = Assembly.GetExecutingAssembly(); Stream iconStream = asm.GetManifestResourceStream("SomeImage.png"); PngBitmapDecoder iconDecoder = new PngBitmapDecoder(iconStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default); ImageSource iconSource = iconDecoder.Frames[0]; _icon.Source = iconSource; The icon is defined something like this: <Image x:Name="_icon" Width="16" Height="16" />

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• Flex video player Seeking with RTMP?

  - by Aswath

  Am working in flex video player with RTMP. My Question is.. How to skip the video file to the middle of a video without having to download the whole file using RTMP. I have some basic questions in flex video player with RTMP. Where i want to put the Video file(FLV). Red5 server location or any other folder. Where i want to put the flex project out put file Red5 server or any other server like XAMPP. How Can i skip the frames in flex using RTMP(*red5*).. Thanks in Advance... Aswath

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• FFmpeg on iPhone

  - by gn-mithun

  Hello, I have downloaded ffmpeg libraries for iPhone and compiled them. My objective is to create a movie file from a series of images using ffmpeg libraries.The amount of documentation for ffmpeg on iphone is very less. I checked an app called iFrameExtractor, which does the opposite of what i want, it extracts frames from a video. On the command line there is a command called ffmpeg -f image2 -i image%d.jpg video.mov This turns a series of images into a video. I actually checked it on my mac and it works fine. What i wanted to know was how do we get the equivalent in iPhone. Or rather which class/api or method to call. There are a couple of examples of apps doing this on iPhone. Not sure whether they do it through ffmpeg though. Anyways, for reference "Time lapser" and "reel moments" Thanks in advance

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• How do I move a Java JFrame partially off my Linux desktop?

  - by Erick Robertson

  I'm writing a Java application with movable frames, and I've come across a quirk in Linux. I'm running GNOME 2.16.0 under CentOS. When I use JFrame.setBounds to set the bounds to any location that's half off the screen, it actually sets the location of the frame to be as close as possible to the bounds specified while still staying completely on the screen. This is confusing because other non-Java windows can move half off the screen. How do I tell Java to tell GNOME to actually put the frame where I specify, even if that's half off the screen?

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• Variable height header with scrollable content area filling remaining viewport area

  - by Neutrino

  I've seen versions of this simple problem raised a dozen times here and elsewhere on the web, but I haven't seen a solution that works for me yet so I'm asking it again. I want a webpage with a variable height full width header (height based on contents). Below that I want a content area that fills the rest of the browser viewport. If the content is larger than the remaining space in the viewport then I want the content area to scroll. I don't need this to work on IE6. I don't care whether the solution uses CSS, tables or a mixture of the two, just no frames and no Javascript. For a bonus point fix a variable height footer to the bottom of the page.

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• HTML page showing blank in iOS6 Safari

  - by K10

  I have a HTML page which is showing blank after it loads completely. Here is the scenario, The page is build with a set of using 3 frames. There are various javascript's which push content into the site. Also, there is a timeout function, which checks if the user has not responded for 3 minutes, it logs out the session. The issue is, when I load this page whole page along with the content gets loaded, but after a fraction of seconds the page goes blank! This issue is only with iOS6 Safari on iPad. Can anyone help me out in figuring out the issue? Thanks in advance.

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• How to read pixel values of a video?

  - by vikramtheone

  Hi Guys, I recently wrote C programs for image processing of BMP images, I had to read the pixel values and process them, it was very simple I followed the BMP header contents and I could get most of the information of the BMP image. Now the challenge is to process videos (Frame by Frame), how can I do it? How will I be able to read the headers of continuous streams of image frames in a video clip? Or else, is it like, for example, the mpeg format will also have universal header, upon reading which I can get the information about the entire video and after the header, all the data are only pixels. I hope I could convey. Has anyone got experience with processing videos? Any books or links to tutorials will be very helpful. Vikram

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• Switching between multiple stacks in gdb 6.3

  - by flagmore

  Hello! There are two stacks in the program: one is created by OS and the second is created by program itself to run some code with it. When the program crashes in the second stack, I want to switch to the main stack in gdb and see the backtrace. Is it possible? I tried to save the rsp to a variable and change it after the crash, but the resulting backtrace was not right. I think gdb cannot differentiate frames in stack.

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• Building a subquery with ARel in Rails3

  - by Christopher

  I am trying to build this query in ARel: SELECT FLOOR(AVG(num)) FROM ( SELECT COUNT(attendees.id) AS num, meetings.club_id FROM `meetings` INNER JOIN `attendees` ON `attendees`.`meeting_id` = `meetings`.`id` WHERE (`meetings`.club_id = 1) GROUP BY meetings.id) tmp GROUP BY tmp.club_id It returns the average number of attendees per meeting, per club. (a club has many meetings and a meeting has many attendees) So far I have (declared in class Club < ActiveRecord::Base): num_attendees = meetings.select("COUNT(attendees.id) AS num").joins(:attendees).group('meetings.id') Arel::Table.new('tmp', self.class.arel_engine).from(num_attendees).project('FLOOR(AVG(num))').group('tmp.club_id').to_sql but, I am getting the error: undefined method `visit_ActiveRecord_Relation' for #<Arel::Visitors::MySQL:0x9b42180> The documentation for generating non trivial ARel queries is a bit hard to come by. I have been using http://rdoc.info/github/rails/arel/master/frames Am I approaching this incorrectly? Or am I a few methods away from a solution?

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• Cross-domain REST proxy with Javascript, HTML5

  - by Bosh

  I'm writing a service (say, service.com) that provides a REST API to external apps running inside of IFrames. (These apps are hosted from domains outside the service.com). I'm planning a javascript client library for the apps to make pure-javascript requests to the service.com REST API -- basically using postMessage and some ad-hoc encapsulation of my API calls to get messages back and forth across frames (from the outside-app.com IFrame -- service.com REST API, and back to the IFrame with a response). My question: is there any robust, general-purpose javascript library to accomplish the kind of cross-domain REST request proxying I need, or should I just hack it from scratch?

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• Any MVVM frameworks work well with NavigationWindows?

  - by Will

  I'd like to "throw away" the current version of a WPF application and move version 2 to a stable MVVM framework. The main concern I'm having is that I don't see much talk about MVVM frameworks and navigation (i.e., NavigationWindows and Frames). My current app relies heavily on Pages to present views to the user. I would prefer to keep it this way. I'd rather not change everything to UserControls and rely on DataTemplates to switch out the view I need to present. Are there any MVVM frameworks that: Work well with NavigationWindows and Pages Provide ViewModels adequate access to the navigation process Provide the ability to change navigation in response to security-related events (e.g., redirect to login Page after logout)

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• Replacing IFrame with div

  - by Roland

  I have a IFrame where I load in a custom search, and display the results within the iframe. The search results I obtain by calling an external url, that returns a value. I need to implement the same thing for a mobi site that works on mobile devices, and thus I need to replace the IFrame with something else. Will this be possible using a div tag, since most mobile devices do not support frames. And no javascript may be used. Any advice will be appreciated.

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• Keep a div from reloading

  - by Josh

  Basically, I want the same effect as the oldschool html 'frameset' I think. Take a look at this page please: http://onomadesign.com/wordpress/identity-design/alteon-a-boeing-company/ If a user selects a project from industry - transportation for example, I would like that the right scrollmenu keeps its initial state when the new project page comes up. So they won't get lost and have to click again to be in the same submenu section. So, the right thumbnail navigation should stay in the same way, I don't want it to reload. Do I have to do it with frames or iframes? Or can I make some kind of jQuery call to 'not reload' that div? Maybe PHP? I'm sorry, I am not a programmer from origin. Thanks in advance.

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• Update image in ASP.NET page from memory without refreshing the page.

  - by ZeeMan

  I have a command line C# server and an ASP.NET client, they both communicate via .NET Remoting. The server is sending the client still images grabbed from a webcam at say 2 frames a second. I can pass the images down to the client via a remote method call and the image ends up in this client method: public void Update(System.Drawing.Image currentFrame) { // I need to display the currentFrame on my page. } How do i display the image on the a page without saving the image to the hard disc? If it was a winForms app i could pass currentFrame to a picturebox ie. picturebox.Image = currentFrame. The above Update method gets fired at least 2 times a second. If the client was a winForms app i could simply put picturebox.Image = currentFrame and the current frame on the screen would automatically get updated. How do i achieve the same effect with ASP.NET? Will the whole page need to be reloaded etc?

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• Outputing resized animated gif to browser using imagick

  - by Freeman

  I intent to resize an animated gif and outputing it to the browser on-the-fly. My problem is that when I save the resized image it is of good quality, but if I echo it to the browser it is of poor quality and the animation is removed. Here is the code:` header("Content-type:image/gif"); try { /* Read in the animated gif */ $animation = new Imagick("images/nikks.gif"); /*** Loop through the frames ***/ foreach ($animation as $frame) { /*** Thumbnail each frame ***/ $frame->thumbnailImage(200, 200); /*** Set virtual canvas size to 100x100 ***/ $frame->setImagePage(200, 200, 0, 0); } /*** Write image to disk. Notice writeImages instead of writeImage ***/ //$animation->writeImages("images/nikkyo1.gif",true); echo $animation; } catch(Exception $e) { echo $e-getMessage(); } `

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• HTML Frameset Query

  - by sarah

  Hi I have the following code for framset display <FRAMESET ROWS="18%,*" > <FRAME SRC="./views/Title_Page.html" NAME=TITLE SCROLLING=NO MARGINHEIGHT=1 noresize="noresize"> <FRAMESET COLS="20%,*"> <FRAME SRC="./views/Navigation_Page.jsp" NAME=SIDEBAR noresize="noresize" scrolling="no"> <FRAME SRC="./views/Welcome.html" NAME=MAIN noresize="noresize"> </FRAMESET> <NOFRAMES>NOFRAMES stuff </NOFRAMES> </FRAMESET> I want to add a logout link which logges out of the app ,when i add a link in Title_Page.html it logges out only that frame but not the others,how will handle it?i want to log out completly from all the frames

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• Disable the anchor tag.

  - by abinila

  I have one anchor tag. I want to disable it after once it clicked. I tried the following way. print "<script type='text/javascript'>parent.window.frames[2].document.getElementById('pagination').innerHTML+=\"<a href=# onclick='pageshow`($i);this.disabled=true'>$i</a>&nbsp;\"</script>"; Note: I don't want to disable the link. I want to disable the link operation. Like Google search page. Eg: 1 2 3 4 5 Next Here once I clicked the 1st page I can't click the same page again. Same thing I want.

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