在播放期间调整AVPlayer帧速率
[英]Adjust AVPlayer Frame Rate During Playback
问题描述
Is there a way to change the rate at which frames are rendered during playback? 
有没有办法改变播放期间渲染帧的速率？ I have a couple short 5 second videos that I would like to play at 15, 30, or 60 FPS. 我有几个简短的5秒视频，我想以15,30或60 FPS播放。 This would be an option to the user. 这将是用户的选项。
I did find a frameDuration property in the AVVideoComposition class. 我确实在AVVideoComposition类中找到了frameDuration属性。 But all this did was adjust how many frames rendered per second. 但所有这一切都是调整每秒渲染的帧数。
1 个解决方案
解决方案1
6 已采纳 2011-11-02 12:40:10
Similar question here 类似的问题在这里
There is a rate property in the AVPlayer. AVPlayer中有一个rate属性。 It worked very well from me. 它对我很有用。 Tho the rate values ranges from 0 to 2, 1 being played at normal speed, so to give the option to the suer to play at pre defined framerate would required some math to find the right rate value. 速率值的范围从0到2,1，正常速度播放1，因此，为了让suer以预定义的帧速率播放，需要一些数学来找到正确的速率值。
Bye, 再见，
Jean 吉恩
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