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• Formula for Live Video Streaming Bitrate

  - by MD

  I am simply looking for the formula that should be used here. All the results I've found base "finding the bitrate" off of already existing video. I'm talking about LIVE streaming. (indeterminate length) So, I know some basic parts of it, but I just need to know if I'm right or missing anything. For Kbps: Resolution * Framerate / 1024 Is it really that simple? Audio would be a separate element for our purposes here. Am I missing anything from this formula? (Coming up with a proposal of what amount of bandwidth would be required, relative to possible resolution options, so I just need to be sure that I'm not missing anything or inaccurate about it)

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• as3 this.graphics calls do nothing

  - by zzz

  class A: [SWF(width='800',height='600',frameRate='24')] public class A extends MovieClip { private var b:B; public function A(){ super(); b = new B(); addChild(b); addEventListener(Event.ENTER_FRAME, update); } private function update(e:Event):void { b.draw(); } } class B: public class B extends MovieClip { public function draw():void { //! following code works well if put in constructor, but not here this.graphics.beginFill(0xff0000); this.graphics.drawCircle(200,200,50); } } this.graphics calls do nothing in draw method, but work fine inside B`s constructor, what i am doing wrong ?

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• How can I respond to mouse events in AS3?

  - by Gabriel Meono

  Background: Trying to make a simple "drop the ball" game. The code is located inside the first frame of the timeline. Nothing more is on the stage. Issue: Using QuickBox2D I made a simple If statement that drops and object acording the Mouse-x position: if (MouseEvent.CLICK) { sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); I imported the MouseEvent library: import flash.events.MouseEvent; Nothing happens if I click, no output errors either. See it in action: http://gabrielmeono.com/download/Lucky_Hit_Alpha.swf http://gabrielmeono.com/download/Lucky_Hit_Alpha.fla Full Code: [SWF(width = 350, height = 600, frameRate = 60)] import com.actionsnippet.qbox.*; import flash.events.MouseEvent; var sim:QuickBox2D = new QuickBox2D(this); sim.createStageWalls(); //var ball:sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); // // make a heavy circle sim.addCircle({x:3, y:1, radius:0.25, density:5}); sim.addCircle({x:2, y:1, radius:0.25, density:5}); sim.addCircle({x:4, y:1, radius:0.25, density:5}); sim.addCircle({x:5, y:1, radius:0.25, density:5}); sim.addCircle({x:6, y:1, radius:0.25, density:5}); // create a few platforms sim.addBox({x:3, y:2, width:4, height:0.2, density:0, angle:0.1}); // make 26 dominoes for (var i:int = 0; i<7; i++){ //End sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0}); sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0}); //Mid end sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0}); //Middle Start sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0}); sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0}); } if (MouseEvent.CLICK) { sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); sim.start(); /*sim.mouseDrag();*/ }

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• BOX2D and AS3: Mouse Event not working

  - by Gabriel Meono

  Background: Trying to make a simple "drop the ball" game. The code is located inside the first frame of the timeline. Nothing more is on the stage. Issue: Using QuickBox2D I made a simple If statement that drops and object acording the Mouse-x position: if (MouseEvent.CLICK) { sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); I imported the MouseEvent library: import flash.events.MouseEvent; Nothing happens if I click, no output errors either. See it in action: http://gabrielmeono.com/download/Lucky_Hit_Alpha.swf http://gabrielmeono.com/download/Lucky_Hit_Alpha.fla Full Code: [SWF(width = 350, height = 600, frameRate = 60)] import com.actionsnippet.qbox.*; import flash.events.MouseEvent; var sim:QuickBox2D = new QuickBox2D(this); sim.createStageWalls(); //var ball:sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); // // make a heavy circle sim.addCircle({x:3, y:1, radius:0.25, density:5}); sim.addCircle({x:2, y:1, radius:0.25, density:5}); sim.addCircle({x:4, y:1, radius:0.25, density:5}); sim.addCircle({x:5, y:1, radius:0.25, density:5}); sim.addCircle({x:6, y:1, radius:0.25, density:5}); // create a few platforms sim.addBox({x:3, y:2, width:4, height:0.2, density:0, angle:0.1}); // make 26 dominoes for (var i:int = 0; i<7; i++){ //End sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0}); sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0}); //Mid end sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0}); //Middle Start sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0}); sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0}); } if (MouseEvent.CLICK) { sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); sim.start(); /*sim.mouseDrag();*/ }

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• How to detect collisions in AS3?

  - by Gabriel Meono

  I'm trying to make a simple game, when the ball falls into certain block, you win. Mechanics: The ball falls through several obstacles, in the end there are two blocks, if the ball touches the left block you win, the next level will contain more blocks and less space between them. Test the movie (click on the screen to drop the ball): http://gabrielmeono.com/downloads/Lucky_Hit_Alpha.swf These are the main variables: var winBox:QuickObject;//You win var looseBox:QuickObject;//You loose var gameBall:QuickObject;//Ball dropped Question: How do I trigger a collision function if the ball hits the winBox? (Win message/Next level) Thanks, here is the full code: package { import flash.display.MovieClip; import com.actionsnippet.qbox.*; import flash.events.MouseEvent; [SWF(width = 600, height = 600, frameRate = 60)] public class LuckyHit extends MovieClip { public var sim:QuickBox2D; var winBox:QuickObject; var looseBox:QuickObject; var gameBall:QuickObject; /** * Constructor */ public function LuckyHit() { sim = new QuickBox2D(this); //sim.createStageWalls(); winBox = sim.addBox({x:5,y:600/30, width:300/30, height:10/30, density:0}); looseBox = sim.addBox({x:15,y:600/30, width:300/30, height:10/30, density:0}); // make obstacles for (var i:int = 0; i<(stage.stageWidth/50); i++){ //End sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0}); sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0}); //Mid End sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0}); //Middle Start sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0}); sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0}); } sim.start(); stage.addEventListener(MouseEvent.CLICK, _clicked); } /** * .. * @param e MouseEvent.CLICK */ private function _clicked(e:MouseEvent) { gameBall = sim.addCircle({x:(mouseX/30), y:(1), radius:0.25, density:5}); } } }

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• Impulsioned jumping

  - by Mutoh

  There's one thing that has been puzzling me, and that is how to implement a 'faux-impulsed' jump in a platformer. If you don't know what I'm talking about, then think of the jumps of Mario, Kirby, and Quote from Cave Story. What do they have in common? Well, the height of your jump is determined by how long you keep the jump button pressed. Knowing that these character's 'impulses' are built not before their jump, as in actual physics, but rather while in mid-air - that is, you can very well lift your finger midway of the max height and it will stop, even if with desacceleration between it and the full stop; which is why you can simply tap for a hop and hold it for a long jump -, I am mesmerized by how they keep their trajetories as arcs. My current implementation works as following: While the jump button is pressed, gravity is turned off and the avatar's Y coordenate is decremented by the constant value of the gravity. For example, if things fall at Z units per tick, it will rise Z units per tick. Once the button is released or the limit is reached, the avatar desaccelerates in an amount that would make it cover X units until its speed reaches 0; once it does, it accelerates up until its speed matches gravity - sticking to the example, I could say it accelerates from 0 to Z units/tick while still covering X units. This implementation, however, makes jumps too diagonal, and unless the avatar's speed is faster than the gravity, which would make it way too fast in my current project (it moves at about 4 pixels per tick and gravity is 10 pixels per tick, at a framerate of 40FPS), it also makes it more vertical than horizontal. Those familiar with platformers would notice that the character's arc'd jump almost always allows them to jump further even if they aren't as fast as the game's gravity, and when it doesn't, if not played right, would prove itself to be very counter-intuitive. I know this because I could attest that my implementation is very annoying. Has anyone ever attempted at similar mechanics, and maybe even succeeded? I'd like to know what's behind this kind of platformer jumping. If you haven't ever had any experience with this beforehand and want to give it a go, then please, don't try to correct or enhance my explained implementation, unless I was on the right way - try to make up your solution from scratch. I don't care if you use gravity, physics or whatnot, as long as it shows how these pseudo-impulses work, it does the job. Also, I'd like its presentation to avoid a language-specific coding; like, sharing us a C++ example, or Delphi... As much as I'm using the XNA framework for my project and wouldn't mind C# stuff, I don't have much patience to read other's code, and I'm certain game developers of other languages would be interested in what we achieve here, so don't mind sticking to pseudo-code. Thank you beforehand.

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• What is causing random hard freezes on my system? Kaspersky?

  - by Christian Ivicevic

  The last few weeks I experienced a new strange behavior of my computer. Sometimes Windows 7 just freezes with no real reason at all. While listening to music for example the playback hangs and you can hear a very nasty sound. Neither mouse nor keyboard input is handled and everything is just stuck. Using Ubuntu this does not happen, so I think it is just a matter of driver issues or a Windows 7 bug. Furthermore I am really suspicious about Kaspersky (Internet Security 11) and so I let it perform a complete virus scan while no other app is running. At about 50% it happened again and I needed to restart the computer by holding the power button the bad way... A really weird thing is that playing Skyrim this happened once, however music playback did not stop. Only the framerate dropped to 0 and sometimes for a few seconds I am able to move. Therefore I am really confused as furthermore no bluescreen pops up. Memtest told me that everything seems to be alright... Can anyone explain me which data you need about my hardware and software (and which tools tools to use to gather the informatik) to be able to provide any help on my problem?

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• Random Hard Freeze of Windows 7 (is Kaspersky to be blamed for this?)

  - by Christian Ivicevic

  The last few weeks I experienced a new strange behavior of my computer. Sometimes Windows 7 just freezes with no real reason at all. While listening to music for example the playback hangs and you can hear a very nasty sound. Neither mouse nor keyboard input is handled and everything is just stuck. Using Ubuntu this does not happen, so I think it is just a matter of driver issues or a Windows 7 bug. Furthermore I am really suspicious about Kaspersky (Internet Security 11) and so I let it perform a complete virus scan while no other app is running. At about 50% it happened again and I needed to restart the computer by holding the power button the bad way... A really weird thing is that playing Skyrim this happened once, however music playback did not stop. Only the framerate dropped to 0 and sometimes for a few seconds I am able to move. Therefore I am really confused as furthermore no bluescreen pops up. Memtest told me that everything seems to be alright... Can anyone explain me which data you need about my hardware and software (and which tools tools to use to gather the informatik) to be able to provide any help on my problem?

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• newsubtitles line not working in FFmpeg

  - by godMode

  i'm trying to run the following line on FFmpeg that will basically "re-format" an MKV file to MP4 without doing any re-encoding and also embed SRT subtitles onto the MP4 output: ffmpeg -i test.mkv -i test.srt -newsubtitle -acodec copy -vcodec copy test.mp4 Without the "-i test.srt -nwesubtitle" bit, it seems to work just fine; however, with it I get the following output: Seems stream 0 codec frame rate differs from container frame rate: 47.95 (5000000/104271) - 23.98 (24000/1001) Stream #0.0(eng): Video: h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc Stream #0.1(eng): Subtitle: 0x0000 Metadata: title : English Stream #0.2(jpn): Audio: aac, 48000 Hz, stereo, s16 Metadata: title : Japanese 2.0 Stream #0.3(eng): Audio: aac, 48000 Hz, stereo, s16 Metadata: title : English 2.0 Stream #0.4(eng): Subtitle: 0x0000 Metadata: title : English Songs & Signs Stream #0.5: Attachment: 0x0000 Metadata: filename : MyriadPro-Bold.ttf Stream #0.6: Attachment: 0x0000 Metadata: filename : MyriadPro-RegularHaruhi.ttf Stream #0.7: Attachment: 0x0000 Metadata: filename : ChaparralPro-BoldIt.ttf Stream #0.8: Attachment: 0x0000 Metadata: filename : ChaparralPro-SemiboldIt.ttf Stream #0.9: Attachment: 0x0000 Metadata: filename : epmgobld_ending.ttf Stream #0.10: Attachment: 0x0000 Metadata: filename : epminbld_opening.ttf Stream #0.11: Attachment: 0x0000 Metadata: filename : Folks-Bold.ttf Stream #0.12: Attachment: 0x0000 Metadata: filename : GosmickSansBold.ttf Stream #0.13: Attachment: 0x0000 Metadata: filename : WarnockPro-LightDisp.ttf Stream #0.14: Attachment: 0x0000 Metadata: filename : epmgobld_ending.ttf Stream #0.15: Attachment: 0x0000 Metadata: filename : GosmickSansBold.ttf Stream #0.16: Attachment: 0x0000 Metadata: filename : Marker SD 1.2.ttf Stream #0.17: Attachment: 0x0000 Metadata: filename : MyriadPro-Bold.ttf Stream #0.18: Attachment: 0x0000 Metadata: filename : MyriadPro-RegularHaruhi.ttf Stream #0.19: Attachment: 0x0000 Metadata: filename : MyriadPro-SemiCn.ttf test.srt: Invalid data found when processing input I tried adding "-r pal", "-r ntsc" or "-r 23.98" thinking it was framerate issue with no change.

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• Looking for an application to record audio and video on a linux "embedded" device

  - by Luke404

  I am working with a linux x86 device with limited CPU resources (as a prototype we just use a pentium-m netbook). We'd like to record video from one V4L2 device (we'll probably end up using just USB Video Class devices like all modern webcams) and one audio stream from an ALSA source. The thing will not have screen and keyboard, and obviously no X11 environment. Goals are: do as little work as possible to cope with little cpu resources - for example I'd like to record video in the native MJPEG I get out of the UVC devices encoding audio to MPEG3 Layer-2 (aka mp2) is ok since it let us save a lot of space (compared to raw pcm samples) and does use little cpu power I don't mind loosing some video frames here and there (UVC devices do that) as long as I can get audio and video streams syncronized not require user input to start the thing (a python script takes care of initialization, startup, shutdown, etc...) be able to open the resulting files for postprocessing without too much effort (ie, if mplayer or vlc can play it, it's fine) So far the only app I found that could be started from command line and record V4L2 video + ALSA audio is mencoder but I'm having some difficulties with it. It should be able to do that but I cannot record audio and video together - just one of the two. And if I use two different processes to record to two different files I have no means to get them in sync (audio is more or less always correct, but video framerate will vary over time and it seems to lack timestamps to correctly play it back to the correct time). Long story short, how do you record an unconverted MJPEG stream (from an UVC device) and an audio stream (from an ALSA device, possibly encoding to any standard format) using a command line tool, to a single file (MPEG or any other container), keeping audio and video in sync?

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• How to create video file from DVD

  - by pkaeding

  I want to take the DVD video slideshow that I got from my wedding photographer, and put the video on youtube (I have permission, I made sure to get the non-exclusive rights to use anything she created while working for me in any way I wanted when we working out the terms before-hand). Can anyone suggest the best way to get a video file that can be uploaded to YouTube from this DVD? The source DVD is not encrypted, so I don't need to worry about that. I am using a Mac, so Mac-friendly suggestions are preferred. Thanks! EDIT: So, I tried Handbrake, and it looks very promising. However, When I select the title in Handbrake, it says it is about 12 minutes long. The resulting file ends up only being about 4 minutes long, and the music is messed up. It seems to be going normally through the photo transitions, but removing the time that the slideshow stays on each photo. I believe the DVD was created using iDVD. Does it do anything weird to save space by varying hte framerate, or anything like that? Are there special settings in Handbrake I need to use?

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• Is there any way to shut up my ATI HD 5770?

  - by slpsys

  So to preface, I basically built Jeff's machine; I already had some of the components, including (scarily enough) the exact same case1. I've been buying bits and pieces over the past few months, which coincided perfectly with his recent post about three monitors, though not being a gamer outright, I opted for the second-from-the-bottom option. After finally plopping all the pieces lovingly into the case this evening, I turn it on...and it sounds like four professional grade hair-driers. Some quick regression analysis determined that with the video card out, the running machine sounded no louder than our house's vents. Basically, my last desktop build included a $45-at-the-time graphics card, and it's been Macbook Pros and workstations since then, so I have zero idea whether I'll just be able to tune the fan speed later on. Will I be able to get this thing to quiet down every time I'm not playing Modern Warfare 2 at maximum framerate, or should I just send this thing back now, and get the quietest card in my pricerange? 1 One thing of note is that I do not have noise-absorbing foam in the case, as is pictured in the article. I'm only mentioning that because I suspect it could drop the overall output a few decibels, but obviously not that many.

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• Would anyone tell me how to fetch the media:thumb element's attribute from a json feed?

  - by ash

  I made a yahoo pipe that pulls up the atoms as json format; however, I can fetch and display all the elements in my html page except for the element's attribute. Would anyone tell me how to fetch the media:thumb element's attribute from a json feed? I am pasting the html page's code with javascript. If you save the html page and then view it in browser, you will see that all the necessary elements get output at html page except for the media:thumb as I cannot display the attribute of media:thumb when the feed is formatted as json. I am also pasting the some portion of the json feed so that you can have an idea what i am talking about. Please tell me how to retrieve attribute from media:thumb element of a json feed by using plain javascript but no server side code or javascript library. Thank you. function getFeed(feed){ var newScript = document.createElement('script'); newScript.type = 'text/javascript'; newScript.src = 'http://pipes.yahoo.com/pipes/pipe.run?_id=40616620df99780bceb3fe923cecd216&_render=json&_callback=piper'; document.getElementsByTagName("head")[0].appendChild(newScript); } function piper(feed){ var tmp=''; for (var i=0; i'; tmp+=feed.value.items[i].title+''; tmp+=feed.value.items[i].author.name+''; tmp+=feed.value.items[i].published+''; if (feed.value.items[i].description) { tmp+=feed.value.items[i].description+''; } tmp+='<hr>'; } document.getElementById('rssLayer').innerHTML=tmp; } </script> bchnbc .............................................................. Some portion of the json feed that gets generated by yahoo pipe .............................................................. piper({"count":2,"value":{"title":"myPipe","description":"Pipes Output","link":"http:\/\/pipes.yahoo.com\/pipes\/pipe.info?_id=f7f4175d493cf1171aecbd3268fea5ee","pubDate":"Fri, 02 Apr 2010 17:59:22 -0700","generator":"http:\/\/pipes.yahoo.com\/pipes\/","callback":"piper", "items": [{ "rights":"Attribution - Noncommercial - No Derivative Works", "link":"http:\/\/vodo.net\/mixtape1", "y:id":{"value":null,"permalink":"true"}, "content":{"content":"We're proud to be releasing this first VODO MIXTAPE. Actual tape might be a thing of the past, but before P2P, mixtapes were the most popular way of sharing popular culture the world had known -- and once called the 'most widely practiced American art form'. We want to resuscitate the spirit of the mixtape for this VODO MIXTAPE series: compilations of our favourite shorts, the weird, the wild and the wonky, all brought together in a temporary and uncomfortable company.","type":"text"}, "author": {"name":"Various"}, "description":"We're proud to be releasing this first VODO MIXTAPE. Actual tape might be a thing of the past, but before P2P, mixtapes were the most popular way of sharing popular culture the world had known -- and once called the 'most widely practiced American art form'. We want to resuscitate the spirit of the mixtape for this VODO MIXTAPE series: compilations of our favourite shorts, the weird, the wild and the wonky, all brought together in a temporary and uncomfortable company.", "media:thumbnail": { "url":"http:\/\/vodo.net\/\/thumbnails\/Mixtape1.jpg" }, "published":"2010-03-08-09:20:20 PM", "format": { "audio_bitrate":null, "width":"608", "xmlns":"http:\/\/xmlns.transmission.cc\/FileFormat", "channels":"2", "samplerate":"44100.0", "duration":"3092.36", "height":"352", "size":"733925376.0", "framerate":"25.0", "audio_codec":"mp3", "video_bitrate":"1898.0", "video_codec":"XVID", "pixel_aspect_ratio":"16:9" }, "y:title":"Mixtape #1: VODO's favourite short films", "title":"Mixtape #1: VODO's favourite short films", "id":null, "pubDate":"2010-03-08-09:20:20 PM", "y:published":{"hour":"3","timezone":"UTC","second":"0","month":"4","minute":"10","utime":"1270264200","day":"3","day_of_week":"6","year":"2010" }}, {"rights":"Attribution - Noncommercial - No Derivative Works","link":"http:\/\/vodo.net\/gilbert","y:id":{"value":"cd6584e06ea4ce7fcd34172f4bbd919e295f8680","permalink":"true"},"content":{"content":"A documentary short about Gilbert, the Beacon Hill \"town crier.\" For the last 9 years, since losing his job and becoming homeless, Gilbert has delivered the weather, sports, and breaking headlines from his spot on the Boston Common. Music (used with permission) in this piece is called \"Blue Bicycle\" by Dusseldorf-based pianist \/ composer Volker Bertelmann also known as Hauschka. Artistic Statement: This is the first in a series of profiles of people who I think are interesting, and who I see on almost a daily basis. I don't want to limit the series to people who live \"on the fringe,\" but it would be appropriate to say that most of the people I interview are eclectic, eccentric, and just a little bit unique. The art is in the viewing - but I hope to turn my lens on individuals that don't always color in the lines, whether they can help it or not.","type":"text"},"author":{"name":"Nathaniel Hansen"},"description":"A documentary short about Gilbert, the Beacon Hill \"town crier.\" For the last 9 years, since losing his job and becoming homeless, Gilbert has delivered the weather, sports, and breaking headlines from his spot on the Boston Common. Music (used with permission) in this piece is called \"Blue Bicycle\" by Dusseldorf-based pianist \/ composer Volker Bertelmann also known as Hauschka. Artistic Statement: This is the first in a series of profiles of people who I think are interesting, and who I see on almost a daily basis. I don't want to limit the series to people who live \"on the fringe,\" but it would be appropriate to say that most of the people I interview are eclectic, eccentric, and just a little bit unique. The art is in the viewing - but I hope to turn my lens on individuals that don't always color in the lines, whether they can help it or not.","media:thumbnail":{"url":"http:\/\/vodo.net\/\/thumbnails\/gilbert.jpeg"},"published":"2010-03-03-10:37:05 AM","format":{"audio_bitrate":null,"width":"624","xmlns":"http:\/\/xmlns.transmission.cc\/FileFormat","channels":"2","samplerate":null,"duration":"373.673","height":"352","size":"123321266.0","framerate":null,"audio_codec":"mp3","video_bitrate":null,"video_codec":"XVID","pixel_aspect_ratio":"16:9"},"y:title":"Gilbert","title":"Gilbert","id":"cd6584e06ea4ce7fcd34172f4bbd919e295f8680","pubDate":"2010-03-03-10:37:05 AM","y:published":{"hour":"3","timezone":"UTC","second":"0","month":"4","minute":"10","utime":"1270264200","day":"3","day_of_week":"6","year":"2010" }} ] }})

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• Day 5 - Tada! My Game Menu Screen Graphics

  - by dapostolov

  So, tonight I took some time to mash up some graphics for my game menu screen. My artistic talent sucks...but here goes nothing...voila, my menu screen!! The Menu Screen The screen above is displaying 4 sprites, even though it looks like maybe 7... I guess one of the first things for me to test in the future is ... is it more memory efficient (and better frame rate) to draw one big background image OR tp paint the screen black, and place each sprite in set locations? To display the 4 sprites above, I borrowed my code from yesterday ... I know, tacky, but...I wanted to see it, feel it. Do you feel it? FEEL IT! (homer voice & shakes fist) Note: the menu items won't scale properly as it stands with this code, well pretty much they do nothing except look pretty... Paint.Net & Google Fun So how did I create that image above? Well, to create the background and 3 menu items I used Paint.Net. Basically, I scoured Google images for: a stone doorway, a stone pillar, an old book, a wizards hat, and...that's it pretty much it! I'll let you type in those searches and see if you can locate the images I used. I know, bad developer...but I figured since I modified the images considerably it doesn't count...well for a personal project it shouldn't count...*shrug* Anyhow, I extracted each key assest I wanted from each image and applied lots of matting, blurring, color changes, glow effects and such. Then, using my vivid imagination I placed / composed each of the layered assets into the mashed up the "scene" above. Pretty cool, eh? Hey, did you know, the cool mist effect is actually a fire rendition in Paint.net? I set it to black & white with opacity set next to nothing. I'm also very proud of the yellow "light" in the stone doorway. I drew that in and then applied gausian blur to it to give it the effect of light creeping out around the door and into the room...heheh. So did I achieve the dark, mysterious ritual as I stated in my design doc? I think I had a great stab at it! Maybe down the road I can get a real artist to crank out some quality graphics for the game... =) So, What's Next? Well, I don't have that animated brazier yet...however, I thought it would be even cooler if I can get that door pulsing that yellow light and it would be extremely cool to have the smoke / mist moving across the screen! Make the creative ideas stop!! (clutches head) haha! I'm having great fun working on this project =) I recommend others giving something like this a try, it's really fulfilling. OK. Tomorrow... I think I'm going to start creating some game / menu objects as per the design doc, maybe even get a custom mouse cursor up on the screen and handle a couple of mouse events, and lastly, maybe a feature to toggle a framerate display... D.

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• Optimizing transition/movement smoothness for a 2D flash game.

  - by Tom

  Update 6: Fenomenas suggested me to re-create everything as simple as possible. I had my doubts that this would make any difference as the algorithm remains the same, and performance did not seem to be the issue. Anyway, it was the only suggestion I got so here it is: 30 FPS: http://www.feedpostal.com/test/simple/30/SimpleMovement.html 40 FPS: http://www.feedpostal.com/test/simple/40/SimpleMovement.html 60 FPS: http://www.feedpostal.com/test/simple/60/SimpleMovement.html 100 FPS: http://www.feedpostal.com/test/simple/100/SimpleMovement.html The code: package { import flash.display.Sprite; import flash.events.Event; import flash.events.KeyboardEvent; import flash.utils.getTimer; [SWF(width="800", height="600", frameRate="40", backgroundColor="#000000")] public class SimpleMovement extends Sprite { private static const TURNING_SPEED:uint = 180; private static const MOVEMENT_SPEED:uint = 400; private static const RADIAN_DIVIDE:Number = Math.PI/180; private var playerObject:Sprite; private var shipContainer:Sprite; private var moving:Boolean = false; private var turningMode:uint = 0; private var movementTimestamp:Number = getTimer(); private var turningTimestamp:Number = movementTimestamp; public function SimpleMovement() { //step 1: create player object playerObject = new Sprite(); playerObject.graphics.lineStyle(1, 0x000000); playerObject.graphics.beginFill(0x6D7B8D); playerObject.graphics.drawRect(0, 0, 25, 50); //make it rotate around the center playerObject.x = 0 - playerObject.width / 2; playerObject.y = 0 - playerObject.height / 2; shipContainer = new Sprite(); shipContainer.addChild(playerObject); shipContainer.x = 100; shipContainer.y = 100; shipContainer.rotation = 180; addChild(shipContainer); //step 2: install keyboard hook when stage is ready addEventListener(Event.ADDED_TO_STAGE, stageReady, false, 0, true); //step 3: install rendering update poll addEventListener(Event.ENTER_FRAME, updatePoller, false, 0, true); } private function updatePoller(event:Event):void { var newTime:Number = getTimer(); //turning if (turningMode != 0) { var turningDeltaTime:Number = newTime - turningTimestamp; turningTimestamp = newTime; var rotation:Number = TURNING_SPEED * turningDeltaTime / 1000; if (turningMode == 1) shipContainer.rotation -= rotation; else shipContainer.rotation += rotation; } //movement if (moving) { var movementDeltaTime:Number = newTime - movementTimestamp; movementTimestamp = newTime; var distance:Number = MOVEMENT_SPEED * movementDeltaTime / 1000; var rAngle:Number = shipContainer.rotation * RADIAN_DIVIDE; //convert degrees to radian shipContainer.x += distance * Math.sin(rAngle); shipContainer.y -= distance * Math.cos(rAngle); } } private function stageReady(event:Event):void { //install keyboard hook stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown, false, 0, true); stage.addEventListener(KeyboardEvent.KEY_UP, keyUp, false, 0, true); } private final function keyDown(event:KeyboardEvent):void { if ((event.keyCode == 87) && (!moving)) //87 = W { movementTimestamp = getTimer(); moving = true; } if ((event.keyCode == 65) && (turningMode != 1)) //65 = A { turningTimestamp = getTimer(); turningMode = 1; } else if ((event.keyCode == 68) && (turningMode != 2)) //68 = D { turningTimestamp = getTimer(); turningMode = 2; } } private final function keyUp(event:KeyboardEvent):void { if ((event.keyCode == 87) && (moving)) moving = false; //87 = W if (((event.keyCode == 65) || (event.keyCode == 68)) && (turningMode != 0)) turningMode = 0; //65 = A, 68 = D } } } The results were as I expected. Absolutely no improvement. I really hope that someone has another suggestion as this thing needs fixing. Also, I doubt it's my system as I have a pretty good one (8GB RAM, Q9550 QuadCore intel, ATI Radeon 4870 512MB). Also, everyone else I asked so far had the same issue with my client. Update 5: another example of a smooth flash game just to demonstrate that my movement definitely is different! See http://www.spel.nl/game/bumpercraft.html Update 4: I traced the time before rendering (EVENT.RENDER) and right after rendering (EVENT.ENTER_FRAME), the results: rendering took: 14 ms rendering took: 14 ms rendering took: 12 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 14 ms rendering took: 12 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 14 ms rendering took: 12 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 14 ms rendering took: 14 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 24 ms rendering took: 18 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 232 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms rendering took: 14 ms rendering took: 16 ms rendering took: 12 ms rendering took: 14 ms rendering took: 12 ms The range is 12-16 ms. During these differences, the shocking/warping/flickering movement was already going on. There is also 1 peak of 232ms, at this time there was a relatively big warp. This is however not the biggest problme, the biggest problem are the continuous small warps during normal movement. Does this give anyone a clue? Update 3: After testing, I know that the following factors are not causing my problem: Bitmap's quality - changed with photoshop to an uglier 8 colours optimized graphic, no improvement at all. Constant rotation of image while turning - disabled it, no improvement at all Browser rendering - tried to use the flash player standalone, no improvement at all I am 100% convinced that the problem lies in either my code or in my algorithm. Please, help me out. It has been almost two weeks (1 week that I asked this question on SO) now and I still have to get my golden answer. Update 1: see bottom for full flex project source and a live demo demonstrating my problem. I'm working on a 2d flash game. Player ships are created as an object: ships[id] = new GameShip(); When movement and rotation information is available, this is being directed to the corresponding ship: ships[id].setMovementMode(1); //move forward Now, within this GameShip object movement works using the "Event.ENTER_FRAME" event: addEventListener(Event.ENTER_FRAME, movementHandler); The following function is then being run: private final function movementHandler(event:Event):void { var newTimeStamp:uint = UtilLib.getTimeStamp(); //set current timeStamp var distance:Number = (newTimeStamp - movementTimeStamp) / 1000 * movementSpeed; //speed = x pixels forward every 1 second movementTimeStamp = newTimeStamp; //update old timeStamp var diagonalChange:Array = getDiagonalChange(movementAngle, distance); //the diagonal position update based on angle and distance charX += diagonalChange[0]; charY += diagonalChange[1]; if (shipContainer) { //when the container is ready to be worked with shipContainer.x = charX; shipContainer.y = charY; } } private final function getDiagonalChange(angle:Number, distance:Number):Array { var rAngle:Number = angle * Math.PI/180; //convert degrees to radian return [Math.sin(rAngle) * distance, (Math.cos(rAngle) * distance) * -1]; } When the object is no longer moving, the event listener will be removed. The same method is being used for rotation. Everything works almost perfect. I've set the project's target FPS to 100 and created a FPS counter. According to the FPS counter, the average FPS in firefox is around 100, while the top is 1000 and the bottom is 22. I think that the bottom and top FPSs are only happening during the initialization of the client (startup). The problem is that the ship appears to be almost perfectly smooth, while it should be just that without the "almost" part. It's almost as if the ship is "flickering" very very fast, you can't actually see it but it's hard to focus on the object while it's moving with your eyes. Also, every now and then, there seems to be a bit of a framerate spike, as if the client is skipping a couple of frames, you then see it quickly warp. It is very difficult to explain what the real problem is, but in general it's that the movement is not perfectly smooth. So, do you have any suggestions on how to make the movement or transition of objects perfectly smooth? Update 1: I re-created the client to demonstrate my problem. Please check it out. The client: http://feedpostal.com/test/MovementTest.html The Actionscript Project (full source): http://feedpostal.com/test/MovementTest.rar An example of a smooth flash game (not created by me): http://www.gamesforwork.com/games/swf/Mission%20Racing_august_10th_2009.swf It took me a pretty long time to recreate this client side version, I hope this will help with solving the problem. Please note: yes, it is actually pretty smooth. But it is definitely not smooth enough.

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• iPhone openGLES performance tuning

  - by genesys

  Hey there! I'm trying now for quite a while to optimize the framerate of my game without really making progress. I'm running on the newest iPhone SDK and have a iPhone 3G 3.1.2 device. I invoke arround 150 drawcalls, rendering about 1900 Triangles in total (all objects are textured using two texturelayers and multitexturing. most textures come from the same textureAtlasTexture stored in pvrtc 2bpp compressed texture). This renders on my phone at arround 30 fps, which appears to me to be way too low for only 1900 triangles. I tried many things to optimize the performance, including batching together the objects, transforming the vertices on the CPU and rendering them in a single drawcall. this yelds 8 drawcalls (as oposed to 150 drawcalls), but performance is about the same (fps drop to arround 26fps) I'm using 32byte vertices stored in an interleaved array (12bytes position, 12bytes normals, 8bytes uv). I'm rendering triangleLists and the vertices are ordered in TriStrip order. I did some profiling but I don't really know how to interprete it. instruments-sampling using Instruments and Sampling yelds this result: http://neo.cycovery.com/instruments_sampling.gif telling me that a lot of time is spent in "mach_msg_trap". I googled for it and it seems this function is called in order to wait for some other things. But wait for what?? instruments-openGL instruments with the openGL module yelds this result: http://neo.cycovery.com/intstruments_openglES_debug.gif but here i have really no idea what those numbers are telling me shark profiling: profiling with shark didn't tell me much either: http://neo.cycovery.com/shark_profile_release.gif the largest number is 10%, spent by DrawTriangles - and the whole rest is spent in very small percentage functions Can anyone tell me what else I could do in order to figure out the bottleneck and could help me to interprete those profiling information? Thanks a lot!

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• Flash video slooow in AIR 2 HTMLLoader component

  - by shane

  I am working on a full screen kiosk application in Flex 4/Air 2 using Flash Builder 4. We have a company training website which staff can access via the kiosk, and the main content is interactive flash training videos. Our target machines are by no means 'beefy', they are Atom n270s @ 1.6Ghz with 1Gb RAM. As it stands the videos are all but unusable when used from within the Air application, the application becomes completely unresponsive (100% cpu usage, click events take approx 5-10 seconds to register). So far I have tried: increasing the default frame rate from 24fps to 60. No improvement. nativeWindow.stage.frameRate = 60; running the videos in a stripped down version of my app, just a full screen HTMLLoader component pointed at the training website. No better than before. disabled hyper threading. The Atom CPU is split into two virtual cores, and the AIR app was only able to use one thread so maxed out at 50% CPU usage. Since the kiosk will only run the AIR app I am happy to loose hyper threading to increase the performance of the Air app. Marginal Improvement. The same website with the same videos is responsive if viewed in ie7 on the same machine, although Internet Explorer takes advantage of the CPU’s hyper threading. The flash videos are built with Adobe Captivate and from what I understand employee JavaScript to relay results back to the server. I will add more information about the video content asap as the training guru is back in the office later this week.

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• Change NSTimer interval for repeating timer.

  - by user300713

  Hi, I am running a mainLoop in Cocoa using an NSTimer set up like this: mainLoopTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/fps target:self selector:@selector(mainloop) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:mainLoopTimer forMode:NSEventTrackingRunLoopMode]; At Program startup I set the timeInterval to 0.0 so that the mainloop runs as fast as possible. Anyways, I would like to provide a function to set the framerate(and thus the time interval of the timer) to a specific value at runtime. Unfortunately as far as I know that means that I have to reinitialize the timer since Cocoa does not provide a function like "setTimerInterval" This is what I tried: - (void)setFrameRate:(float)aFps { NSLog(@"setFrameRate"); [mainLoopTimer invalidate]; mainLoopTimer = nil; mainLoopTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/aFps target:self selector:@selector(mainloop) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:mainLoopTimer forMode:NSEventTrackingRunLoopMode]; } but this throws the following error and stops the mainloop: 2010-06-09 11:14:15.868 myTarget[7313:a0f] setFrameRate 2010-06-09 11:14:15.868 myTarget[7313:a0f] * __NSAutoreleaseNoPool(): Object 0x40cd80 of class __NSCFDate autoreleased with no pool in place - just leaking 2010-06-09 11:14:15.869 myTarget[7313:a0f] * __NSAutoreleaseNoPool(): Object 0x40e700 of class NSCFTimer autoreleased with no pool in place - just leaking 0.614628 I also tried to recreate the timer using the "retain" keyword, but that didn't change anything. Any ideas about how to dynamically change the interval of an NSTimer at runtime? Thanks!

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• FLV performance and garbage collection

  - by justinbach

  I'm building a large flash site (AS3) that uses huge FLVs as transition videos from section to section. The FLVs are 1280x800 and are being scaled to 1680x1050 (much of which is not displayed to users with smaller screens), and are around 5-8 seconds apiece. I'm encoding the videos using On2's hi-def codec, VP6-S, and playback is pretty good with native FLV players, Perian-equipped Quicktime, and simple proof-of-concept FLV playback apps built in AS3. The problem I'm having is that in the context of the actual site, playback isn't as smooth; the framerate isn't quite as good as it should be, and more problematically, there's occasional jerkiness and dropped frames (sometimes pausing the video for as long as a quarter of a second or so). My guess is that this is being caused by garbage collection in the Flash player, which happens nondeterministically and is therefore hard to test and control for. I'm using a single instance of FLVPlayback to play the videos; I originally was using NetStream objects and so forth directly but switched to FLVPlayback for this reason. Has anyone experienced this sort of jerkiness with FLVPlayback (or more generally, with hi-def Flash video)? Am I right about GC being the culprit here, and if so, is there any way to prevent it during playback of these system-intensive transitions?

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• Sending series of images to display like a movie on iPhone

  - by unknownthreat

  Allow me to elaborate more. On the server, we will have a program that will take data from iPhone and process that data and produce series of images. Each time an image is generated, it will be send back to display on iPhone. I have done all of the things above using UDP, OpenGL, and such. It works. The images are transferred to iPhone and can be displayed, but it is slow. The image's resolution is around 320 x 420 and we send the image pixels by pixels. This naive implementation leads to a slow framerate. I can see around 2-3 frames per second. There are also some UDP packets dropped, and this is expected. Are there any sort of compression method available for something like this? Are there any other method that can make this better? NOTE: please don't just write "compression" as an answer, because we are aware that we will need to do it in some ways.

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• Fast, very lightweight algorithm for camera motion detection?

  - by Ertebolle

  I'm working on an augmented reality app for iPhone that involves a very processor-intensive object recognition algorithm (pushing the CPU at 100% it can get through maybe 5 frames per second), and in an effort to both save battery power and make the whole thing less "jittery" I'm trying to come up with a way to only run that object recognizer when the user is actually moving the camera around. My first thought was to simply use the iPhone's accelerometers / gyroscope, but in testing I found that very often people would move the iPhone at a consistent enough attitude and velocity that there wouldn't be any way to tell that it was still in motion. So that left the option of analyzing the actual video feed and detecting movement in that. I got OpenCV working and tried running their pyramidal Lucas-Kanade optical flow algorithm, which works well but seems to be almost as processor-intensive as my object recognizer - I can get it to an acceptable framerate if I lower the depth levels / downsample the image / track fewer points, but then accuracy suffers and it starts to miss some large movements and trigger on small hand-shaking-y ones. So my question is, is there another optical flow algorithm that's faster than Lucas-Kanade if I just want to detect the overall magnitude of camera movement? I don't need to track individual objects, I don't even need to know which direction the camera is moving, all I really need is a way to feed something two frames of video and have it tell me how far apart they are.

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• How to know why an animation stutters?

  - by Patrick Klug

  I have a few fairly simple animations (moving text around, moving ellipses etc.) and running in full screen (1920x1080 minus the task bar) the WPF Performance Suite reports a good framerate around 50 FPS throughout the animation. Dirty Rect Addition is somewhere around 300 rect/s, the SW frames are between 0 and 4 and the HW frames are between 3 and 5. Video memory usage is around 80 MB. Problem is that the animations stutters every other half second. My machine is a new Dell laptop XPS 15 with the GeForce GT 435 with 2GB memory. - The drivers are up to date. (The same behavior occurs on my netbook (in full screen) as well so I don't think it is hardware related.) If I make the window smaller the stutter goes away. The stutter occurs with the simplest of animations - even with just a couple of elements but adding more elements certainly makes it more noticeable. How can I find out what causes this stutter? When I think of it, I have not actually seen any WPF animations which run smoothly in full screen. Is this even possible?

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• 2D platformer gravity physics with slow-motion

  - by DD

  Hi all, I fine tuned my 2d platformer physics and when I added slow-motion I realized that it is messed up. The problem I have is that for some reason the physics still depends on framerate. So when I scale down time elapsed, every force is scaled down as well. So the jump force is scaled down, meaning in slow-motion, character jumps vertically smaller height and gravity force is scaled down as well so the character goes further in the air without falling. I'm sending update function in hopes that someone can help me out here (I separated vertical (jump, gravity) and walking (arbitrary walking direction on a platform - platforms can be of any angle) vectors): characterUpdate:(float)dt { //Compute walking velocity walkingAcceleration = direction of platform * walking acceleration constant * dt; initialWalkingVelocity = walkingVelocity; if( isWalking ) { if( !isJumping ) walkingVelocity = walkingVelocity + walkingAcceleration; else walkingVelocity = walkingVelocity + Vector( walking acceleration constant * dt, 0 ); } // Compute jump/fall velocity if( !isOnPlatform ) { initialVerticalVelocity = verticalVelocity; verticalVelocity = verticalVelocity + verticalAcceleration * dt; } // Add walking velocity position = position + ( walkingVelocity + initialWalkingVelocity ) * 0.5 * dt; //Add jump/fall velocity if not on a platform if( !isOnPlatform ) position = position + ( verticalVelocity + initialVerticalVelocity ) * 0.5 * dt; verticalAcceleration.y = Gravity * dt; }

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• Rapid taps on an OpenGL ES app introducing input delay

  - by Tim R.

  I am starting out writing a 2D game in OpenGL ES, and I have encountered an odd problem: if I rapidly tap the touchscreen, the input starts lagging behind the display. The more times I tap, the more delay it causes between the input and any indication of that input onscreen. It only happens if I intentionally tap very rapidly, but not from tapping and dragging with any number of fingers. What could be causing this? Excessive details follow: Both accelerometer input and taps are delayed by just tapping. The only events I am responding to are touchesBegan (below) in my EAGLView and accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration in my Game object. There doesn't seem to be any upper limit to the amount of delay: I've gotten up to 12 seconds of delay by tapping rapidly with five fingers. I have not seen any drops in framerate (it stays constantly at 60 fps) in the OpenGL ES tool in Instruments or by taking 1/the time between updates. Possibly relevant code: - (void) drawView:(id) sender { [game update:allTouches]; [renderer render:game]; } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { allTouches = [event allTouches]; } allTouches is a pointer that gets passed to my Game every update, which passes it to each GameObject in their update methods.

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• Making firefox refresh images faster

  - by Earlz

  I have a thing I'm doing where I need a webpage to stream a series of images from the local client computer. I have a very simple run here: http://jsbin.com/idowi/34 The code is extremely simple setTimeout ( "refreshImage()", 100 ); function refreshImage(){ var date = new Date() var ticks = date.getTime() $('#image').attr('src','http://127.0.0.1:2723/signature?'+ticks.toString()); setTimeout ("refreshImage()", 100 ); } Basically I have a signature pad being used on the client machine. We want for the signature to show up in the web page and for them to see themselves signing it within the web page(the pad does not have an LCD to show it to them right there). So I setup a simple local HTTP server which grabs an image of what the current state of the signature pad looks like and it gets sent to the browser. This has no problems in any browser(tested in IE7, 8, and Chrome) but Firefox where it is extremely laggy and jumpy and doesn't keep with the 10 FPS rate. Does anyone have any ideas on how to fix this? I've tried creating very simple double buffering in javascript but that just made things worse. Also for a bit more information it seems that Firefox is executing the javascript at the correct framerate as on the server the requests are coming in at a constant speed. But the images are only refreshed inconsistently ranging from 5 times per second all the way down to 0 times per second(taking 2 seconds to do a refresh) Also I have tried using different image formats all with the same results. The formats I've tried include bitmaps, PNGs, and GIFs (GIFs caused a minor problem in Chrome with flicker though) Could it be possible that Firefox is somehow caching my images causing a slight lag? I send these headers though: Pragma-directive: no-cache Cache-directive: no-cache Cache-control: no-cache Pragma: no-cache Expires: 0

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