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• Why is chunk size often a power of two?

  - by danijar

  There are many Minecraft clones out there and I am working on my own implementation. A principle of terrain rendering is tiling the whole world in fixed size chunks to reduce the effort of localized changes. In Minecraft the chunk size is 16 x 16 x 256 as far as I now. And in clones I also always saw chunk sizes of a power of the number 2. Is there any reason for that, maybe performance or memory related? I know that powers of 2 play a special role in binary computers but what has that to do with the chunk size?

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• What is the state-of-the-art for using Broadcom Crystal hardware?

  - by echo-flow

  I just bought a Dell Mini 1012, which comes with a Broadcom Crystal media accelerator chip. I'd like to know what is the current state-of-the-art with regard to using this hardware on Ubuntu? What I mean by this is, what is the best way to install drivers to make use of this hardware, and what media players currently support it? I've read that XBMC currently does, but what about gstreamer? Ideally, I'd like to find a solution so that I can accelerate Flash videos using the device. It seems like one strategy may be to download Flash videos to the hard drive and play them with an external, Crystal-enabled media player, and so that seems like one option, but I'm wondering if any of the free flash alternatives (Gnash and Lightspark) support hardware acceleration of flash video using the Crystal API? It seems like there is a lot of information about all of this on the web, but it's not consolidated, and seems like a rapidly moving target, so any insight anyone may have into this would be appreciated.

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• How can I allow a user to stream my videos securely?

  - by John Baber

  I've got a script that records 10 minute videos from a webcam to video1.mp4 video2.mp4 video3.mp4 video4.mp4 Then records over video1 again in rotation. I'd like one user to be able to view these in winamp or itunes by having a playlist with the four of them on repeat. (This is my way of getting around the many hours of figuring out how to actually livestream from a webcam with VLC). I don't see any examples of things like icecast being used for video, and I don't see any mentions of secure streaming. My question is, is there any way to have these videos be seen securely? I can do things like https on my server, but I don't have great access to the user's machine, so just sharing a directory by samba or sshfs isn't much of an option.

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• WinTV-HVR-1900 no picture in VLC

  - by nLinked

  I've connected a Hauppauge WinTV-HVR-1900 to my Ubuntu 10.10 PC and used the instructions here to install the firmware and test that it is detected using dmesg. Detection is successful. The WinTV is connected to my TV using component connections. I run this command to enable the component interface: v4l2-ctl -i 1. Then I use cat /dev/video0 test.mpg, and that file is created and plays perfectly with video and sound. However, when I try to play /dev/video0 in VLC Player (and other players), I just get a black screen. I also try the v4l2-ctl -i 1 command before I try it in VLC, but I still get a black screen, and when I use v4l2-ctl -I, it shows it has connection 0 again (Television), so it reverts back to connection 0 instead of connection 1 (component). So I'm a little stuck with getting VLC to get a picture, even though the CAT command works fine. Anything I can try?

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• What is an acceptable GC frequency for a SlimDX/Windows/.NET game?

  - by Rei Miyasaka

  I understand that the Windows GC is much better than the Xbox/WP7 GC, being that it's generational and multithreaded -- so I don't need to worry quite as much about avoiding memory allocation. SlimDX even has some unavoidable functions that generate some amount of garbage (specifically, MapSubresource creates DataBoxes), yet people don't seem to be too upset about it. I'd like to use some functional paradigms to write my code too, which also means creating objects like closures and monads. I know premature optimization isn't a good thing, but are there rules of thumb or metrics that I can follow to know whether I need to cut down on allocations? Is, say, one gen 0 GC per frame too much? One thing that has me stumped is object promotions. Gen 0 GCs will supposedly finish within a millisecond or two, but if I'm understanding correctly, it's the gen 1 and 2 promotions that start to hurt. I'm not too sure how I can predict/prevent these.

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• Ubuntu gets slower by the day

  - by Doug

  Ive noticed that Ubuntu has been getting slower and slower to boot, launch programs, etc. I installed 12.04 about 4 months ago,now 12.10, running on a quad-core Q8300 Intel, 4GB Ram, and an 80GB WD IDE drive. For some reason (ever since 11.04), Ive noticed after installation, the speed is good. The longer I have the OS installed, every bootup gets slower and slower, launching programs get slower, frame rates change radically(onboard GF9400 gets anywhere from 60fps down to 12 in worst cases). I would think maybe the HD is the issue, however I installed 11.10 on a 160GB SATA, and the same thing occurred. Looking at system resources, I'm holding steady at 1GB memory usage (I have 4GB, but it's actually showing 3.6GB, dunno why), no swap usage, and using right around 4% on cpu currently. HD capacity is only 28% used. Has anyone else ran into this issue? I love Ubuntu to death, but using other distros other than Ubuntu, I dont have this problem.

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• PAE on Ubuntu 12.04

  - by JamesStewy

  I am having trouble using PAE on Ubuntu 12.04 LTS 32bit. I recently upgraded from 4 to 8gb of RAM but PAE doesn't appear to have picked this up. When I run "grep --color=always -i PAE /proc/cpuinfo" I get pae in the list. When I run "dmidecode | grep Size | grep MB" Installed Size is 3825 but the Maximum Total Memory Size: 8192 MB. When I check the BIOS it says there is 8192 MB available and the computer fully supports I have followed everything I can find on the internet (including this https://help.ubuntu.com/community/EnablingPAE) and nothing is working. My Computer is a Toshiba Portege m750. It has an Intel Centrino Core 2 Duo processor. Bought in 2009 Thanks, JamesStewy

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• Which CMS can I use for my project?

  - by Nicolás A.

  I have to build a new website for my client.. and he needs this stuff: A user generated content website.. where users can upload their own videos.. (i will use a video hosting platform with api like fliqz.com) I must manage a big user system.. where users can create their own "sub-users"... the site must manage paid subscriptions and payments through paypal.. and other payment gateways... So the question is.. i have to use a pre-built CMS and extend it.. or just a good framework? I've been thinking about joomla, drupal and expressionengine... It's not neccesary to use a open source cms... I've looking at drupal.. but is not as easy to understand and extend... Can anyone help me to make a good decision?

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• HW resources for the device driver [closed]

  - by VladimirLenin

  Need to provide memory and IRQ resources to the Linux kernel in order to bring up the CAN controller. Have no idea how to get them. Below is the structure I need to fill in. This structure I have taken for example, this is for the Run-Time Clock, but I need for CAN controller. Both are on the same board, and there are constants for RT Clock (and all other devices), but not for my CAN chip. When looking at the subject chip driver's code (sp_probe() function), I see it needs the same type resources. struct resource tegra_rtc_resources[] = { [0] = { .start = ???, .end = ???, .flags = IORESOURCE_MEM, }, [1] = { .start = ???, .end = ???, .flags = IORESOURCE_IRQ, }, };

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• Can I copy large files faster without using the file cache?

  - by Veazer

  After adding the preload package, my applications seem to speed up but if I copy a large file, the file cache grows by more than double the size of the file. By transferring a single 3-4 GB virtualbox image or video file to an external drive, this huge cache seems to remove all the preloaded applications from memory, leading to increased load times and general performance drops. Is there a way to copy large, multi-gigabyte files without caching them (i.e. bypassing the file cache)? Or a way to whitelist or blacklist specific folders from being cached?

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• Can't get whole picture on the screen of a new monitor

  - by Gillian

  I have a 24inch, VM2453mh-LED, Viewsonic monitor using a Radeon 6570HD video card. Both are new. Viewsonic says the optimum size is 1920x1080. At this size the picture is beautiful, but it overlaps the screen vertically and horizontally. I am using Ubuntu 11.10, the Gnome 3 version, not Unity. On the Overview screen, the vertical icons are nearly off screen. Only the right edge shows. I opened the monitor's control menus to see if I could adjust it, but both the H/V Position and Horizontal Size are grayed out. I tried a 1600x1200 setting, and the picture was in bounds, but the quality was less, and it was stretched horizontally. The two monitor menu options were grayed out just like with the 1920x1080 setting. Can someone tell me how to resolve this problem?

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• How do I read my PDFs and watch videos properly again?

  - by asp

  Whenever I watch videos, either online of local via Totem and/or open PDF files using evince. The system gets really, really bogged down. All apps get really slow, menus take forever to display, switching windows gives me time to make a coffee, etc. I have a couple of bug reports open on this, but what do I need to do to really troubleshoot the issue? I've purged Adobe Flash from the system, but YouTube HTML5 videos still have the issue. A bunch of PDFs saved locally trigger the problem. And to (temporarily) remove the slowness, I need to shutdown the computer, breath for a few minutes, then restart. A simple reboot does not do the trick. How can I identify the cause? This only started on 13.04. I've had Ubuntu on this machine for a year without a problem until "upgrading" to 13.04. I am not a programmer, but I suspect an issue with the Intel video driver.

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• Black screen in kernel 3.8 (not 3.5, 3.11, 3.13)

  - by TheDeeno

  I need to use kernel 3.8 to address some docker compatibility issues. However, after installing this kernel when I attempt to boot my machine I get a black screen. The system appears to boot to the login screen (I hear the drum sounds), but the screen remains black. If I boot into recovery mode the video works, but is buggy/slow. In recover mode it looks like it's using the vesa driver. It'd be great if I can force this in normal mode. My machine has an ivy bridge intel processor with integrated graphics What should I do next to troubleshoot this?

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• How to convert mkv to dvd or avi

  - by nathanvda

  I have some mkv files, and while Totem plays them perfectly, when i use Devede to burn them to dvd it all gets messed up: the video is ok, but the audio is out of sync. I did see that Devede does write my dixv avi files correctly to disk. So i am thinking what the best way could be to convert my mkv for playback on dvd? I was thinking maybe converting them to avi first? But i did not find a good way for that to happen. What do you suggest?

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• How do I install drivers for graphics and sound?

  - by Sid

  I recently shifted to Ubuntu 12.04 from windows 7. I completely removed Windows and then installed Ubuntu. However, I can't find a way to download and install drivers for my video and audio hardware like I used to be able to do in Windows. Could someone please explain to me how software and drivers, in general, are installed on Ubuntu. Is installing through 'Ubuntu Software Center' the only way to install them? My laptop model is: Dell Inspiron 14 N4010 (i5/4gb/500gb). Kindly help. Thanks in advance.

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• Unable to install cedarview-graphics-drivers

  - by antnchv

  $ sudo apt-get install cedarview-graphics-drivers Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: cedarview-graphics-drivers : Depends: xserver-xorg-core (= 2:1.10.99.901) Depends: xorg-video-abi-11 E: Unable to correct problems, you have held broken packages. Please advice.

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• ubuntu freezes daily

  - by alme1304

  I have been using ubuntu daily for about 2 weeks now. I really like it but I have noticed that it freezes daily when I have things like chromium and firefox open or when I start watching videos. I realize these might be memory intensive apps/actions but I doubt that with my comps specs they would cause it to freeze. When I installed ubuntu, I remember that it warned me about installing it in a ext2 partition and not in a ext4 one. Could that be the issue? and is there a way to fix it without reinstalling? edit: specs are, 1.9gb ram & Intel® Core™2 CPU 6400 @ 2.13GHz × 2; ubuntu 12.04x64

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• QtWebKit problems playing HTML5 video

  - by oskar

  I have a simple Qt application that launches a window with a QWebView. I tried several sites using the video tag with h.264, and it either can't play the video at all (as in youtube or sublime video), or it renders the video poorly, with black lines covering parts of it, like when viewing the video here. Is this a known issue with QtWebKit, or have I neglected to do something that would make it work better? My code is below. #include <QtGui/QApplication> #include <QWebView> int main(int argc, char *argv[]) { QApplication a(argc, argv); QWebView *view = new QWebView(); view->load(QUrl("http://webkit.org/blog/140/html5-media-support/")); view->show(); return a.exec(); }

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• Memory issue regarding UIImageView on IPhone 4.0 / IPad

  - by Sagar Mane

  Hello All, My Application is crashing due to low memory [ Received memory warning level 1 + 2] To trace this I have used Instrument and come with following points Test Enviorment : Single view controller added on Window When I don't use UIImageView Real Memory is used 3.66 MB When I uses UIImageView with Image having size 25 KB : Real Memory is used 4.24 MB. almost 560 KB extra when compare to w/o UIImageView and which keep on adding as I am adding more UIImageview on the view. below is sample code for adding UIImageview which I am refering UIImageView* iSplashImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Default-Landscape.png"]]; iSplashImage.frame = CGRectMake(0, 0, 320, 480); [self.window addSubview:iSplashImage]; AND dealloc if(iSplashImage) { [iSplashImage release]; iSplashImage = nil; } Issue is this 560 KB is not getting release and after some time application receives low memory warning. Can anyone point out if I am missing something or doing else. As My application uses lots of Images in One session. Thanks in Advance, Sagar

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• moving SDL video surface

  - by runrunraygun

  Does anyone know how to move my SDL.net video surface around the screen programtically? Surface videoContext = Video.SetVideoMode(1024, 768, 32, false, false, false, true, true); var a = System.Windows.Forms.Control.FromHandle(Video.WindowHandle); var b = System.Windows.Forms.NativeWindow.FromHandle(Video.WindowHandle); I can't find any properties in Surface or Video which do the job, and FromHandle is returning Null. The window is initializing falling off the bottom of the screen. Any ideas?

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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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• JRuby 1.7.0 will not install bundler given plenty of memory

  - by user678615

  I installed jruby with rvm install jruby-1.7.0 and it ran out of memory when it tried to create the gemsets so I started by trying to install bundler with the new version and this is what I get ~>gem install bundler Error: Your application used more stack memory than the safety cap of 2048K. Specify -J-Xss####k to increase it (#### = cap size in KB). Specify -w for full StackOverflowError stack trace So I moved up the memory and I still got nothing with a huge chunk of memory ~>JRUBY_OPTS=-J-Xss1024m gem install bundler Error: Your application used more stack memory than the safety cap of 1024M. Specify -J-Xss####k to increase it (#### = cap size in KB). Specify -w for full StackOverflowError stack trace How the hell can that not be enough I run applications on less than that

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• resizing arrays when close to memory capacity

  - by user548928

  So I am implementing my own hashtable in java, since the built in hashtable has ridiculous memory overhead per entry. I'm making an open-addressed table with a variant of quadratic hashing, which is backed internally by two arrays, one for keys and one for values. I don't have the ability to resize though. The obvious way to do it is to create larger arrays and then hash all of the (key, value) pairs into the new arrays from the old ones. This falls apart though when my old arrays take up over 50% of my current memory, since I can't fit both the old and new arrays in memory at the same time. Is there any way to resize my hashtable in this situation Edit: the info I got for current hashtable memory overheads is from here How much memory does a Hashtable use? Also, for my current application, my values are ints, so rather than store references to Integers, I have an array of ints as my values.

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• Discovered: Run A Video In An Image

  - by Moon .

  okay i have found the way to run a video in a image.... the procedure as given below 1 - Run a video in Windows Media Player 2 - While the video running, Press Print Screen 3 - Paste it in MS Paint 4 - Save the image in JPEG or BMP format 5 - Run any video in Windows Media Player again 6 - Now open that image, in Windows Page\Fax Viewer or ACDsee etc. 7 - at this time the win. media player is playing and the image is open 8- Switch to image (focus on image) and you will see the currently running video in the image can anybody with extensive knowledge of windows tell me why does this happen. Well this doesn't work in all versions of windows and media players. i tried this on the follwing setup Windows Media Player 10 Windows XP 2006 SP2

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• head detection from video

  - by Aman Kaushal

  I have to detect heads of people in crowd in real time.For that I detected edge from video using matlab but from edge detected video , how to identify heads that i am unable to do. I used edge detection of video because it is easy to find circle from edged video and detection of head would be easy can anyone help me or suggest me any method for head- detection in real time. I have used VGG head detector and viola jones algorithm but it is only detecting face for small size video not detecting heads for large crowd. Suggestions?

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