2014/10/15 下午 10:09:22

iphone Programming Glossary: frameduration

How to measure true FPS performance of OpenGL ES?

http://stackoverflow.com/questions/6586635/how-to-measure-true-fps-performance-of-opengl-es

Do your OpenGL ES frame rendering here as well as presenting the onscreen render buffer CFTimeInterval frameDuration CFAbsoluteTimeGetCurrent previousTimestamp NSLog @ Frame duration f ms frameDuration 1000.0 to obtain rendering time. If.. render buffer CFTimeInterval frameDuration CFAbsoluteTimeGetCurrent previousTimestamp 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.. 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 deferred renderer in iOS and other..

Setting AVMutableComposition's frameDuration

http://stackoverflow.com/questions/9725193/setting-avmutablecompositions-frameduration

AVMutableComposition's frameDuration I'm playing with the AVEditDemo project from Apple's WWDC 2010 sample pack and I'm trying to change the frame rate of the.. to change the frame rate of the exported video. The video is exported using an AVMutableComposition on which the frameDuration is set like that videoComposition.frameDuration CMTimeMake 1 30 30 fps For some reason changing the 30 to 25 does not change.. The video is exported using an AVMutableComposition on which the frameDuration is set like 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..