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2014/10/15 ¤U¤È 10:09:22
iphone Programming Glossary: framerateHardware accelerated h.264 decoding to texture, overlay or similar in iOS http://stackoverflow.com/questions/10646657/hardware-accelerated-h-264-decoding-to-texture-overlay-or-similar-in-ios 30 FPS. Some of the more expensive filters can tax the GPU and slow this down a bit but most filters operate in these framerate ranges. If you want you can examine the GPUImageMovie class to see how it does this uploading to OpenGL ES but the relevant..
UITableView & UIScrollview stop cocos2d animations http://stackoverflow.com/questions/15185720/uitableview-uiscrollview-stop-cocos2d-animations 2.x for example EAGLView CCGLView EAGLContext CCGLContext. Other solutions revolve around timers and or reducing the framerate animationInterval and or changing the run loop mode of the display link object. They don't really work too well scrolling..
optimizing iPhone OpenGL ES fill rate http://stackoverflow.com/questions/2785640/optimizing-iphone-opengl-es-fill-rate iPhone OpenGL ES fill rate I have an Open GL ES game on the iPhone. My framerate is pretty sucky ~20fps. Using the Xcode OpenGL ES performance tool on an iPhone 3G it shows Renderer Utilization 95 to 99.. ~27 I am drawing a lot of pretty large images with a lot of blending. If I reduce the number of images drawn framerates go from ~20 to ~40 though the performance tool results stay about the same renderer still maxed . I think I'm being limited.. being rendered in ~6 glDrawArrays calls. I often glTranslate before calling glDrawArrays. Would it improve the framerate to switch to VBOs I don't think it is a huge amount of geometry but maybe it is faster for other reasons Are there certain..
Can I mix OpenglES with standard Cocoa widgets on an iPhone app? http://stackoverflow.com/questions/3057529/can-i-mix-opengles-with-standard-cocoa-widgets-on-an-iphone-app application where I place two UIButtons on top of my OpenGL ES view. In my benchmarks you lose ~1 5 of your OpenGL framerate by placing other views on top of the OpenGL ES view which is not too terrible. What you don't want to do is make your OpenGL..
iPhone SDK 4 AVFoundation - How to use captureStillImageAsynchronouslyFromConnection correctly? http://stackoverflow.com/questions/3847140/iphone-sdk-4-avfoundation-how-to-use-capturestillimageasynchronouslyfromconnec
How to draw a background fast in cocos2d? http://stackoverflow.com/questions/3899903/how-to-draw-a-background-fast-in-cocos2d I get a solid 60fps. I've tried converting the image to PVRTC and that did give an extra fps or two. I get identical framerates using a 1024x768 image instead of the tiled version. Since my background will remain axis aligned unscaled and generally.. Turns out cocos2d moves in mysterious ways. Adding the background to an otherwise empty wrapping CCSprite gets the framerate back up to 60 CCSprite spback CCSprite CCSprite alloc init self addChild spback CCSprite sp CCSprite spriteWithFile @ Background.png..
Fast, very lightweight algorithm for camera motion detection? http://stackoverflow.com/questions/4393841/fast-very-lightweight-algorithm-for-camera-motion-detection 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..
http://stackoverflow.com/questions/4473894/alternatives-to-creating-an-opengl-texture-from-a-captured-video-frame-to-overla
What's the best approach to draw lines between views? http://stackoverflow.com/questions/5847876/whats-the-best-approach-to-draw-lines-between-views
How to measure true FPS performance of OpenGL ES? http://stackoverflow.com/questions/6586635/how-to-measure-true-fps-performance-of-opengl-es The real one. How iphone objective c ios opengl es share improve this question Measuring OpenGL ES performance by framerate may not be the best approach . I've taken to recording frame time myself which seems to provide a more accurate assessment.. NSLog @ Frame duration f ms frameDuration 1000.0 to obtain rendering time. If you want it your instantaneous framerate is the inverse of frameDuration in the above code. Be careful to time the entire frame rendering because the tile based.. by delaying them until just before the frame is drawn to the screen. However if you want to obtain a less precise framerate from Instruments you can do that using the OpenGL ES Driver instrument which reports Core Animation Frames Per Second as..
Optimization of a GC language, any ideas? http://stackoverflow.com/questions/6597847/optimization-of-a-gc-language-any-ideas an XNA wrapper library called ExEn and try as I might I've found it very hard to get the game to reach a playable framerate on an iPhone4 don't even want to think about iPhone3GS at this point . The performance degradation is almost certainly in.. at this point . The performance degradation is almost certainly in the physics calculations if I turn physics off the framerate jumps up sharply if I disable everything rendering input audio and just leave physics on performance hovers around 15fps..
Are the Core Image filters in iOS 5.0 fast enough for realtime video processing? http://stackoverflow.com/questions/6625888/are-the-core-image-filters-in-ios-5-0-fast-enough-for-realtime-video-processing the shader and or video input size to determine if your particular device could handle this processing at a decent framerate. Core Image may add a little overhead but it also has some clever optimizations for how it organizes filter chains. The..
How can I mute the capture sound in AVFoundation? http://stackoverflow.com/questions/9557081/how-can-i-mute-the-capture-sound-in-avfoundation too many frames waiting in the queue because it can cause memory issues . It is similar to the inverse of the maximum framerate. In this example we set a min frame duration of 1 10 seconds so a maximum framerate of 10fps. We say that we are not able.. to the inverse of the maximum framerate. In this example we set a min frame duration of 1 10 seconds so a maximum framerate of 10fps. We say that we are not able to process more than 10 frames per second. captureOutput.minFrameDuration CMTimeMake..
Setting AVMutableComposition's frameDuration http://stackoverflow.com/questions/9725193/setting-avmutablecompositions-frameduration that videoComposition.frameDuration CMTimeMake 1 30 30 fps For some reason changing the 30 to 25 does not change the framerate of the video exported with the AVAssetExportSession . Does anyone have an idea why iphone ios avfoundation avassetexportsession..
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