问题
Is there a way to change the rate at which frames are rendered during playback? I have a couple short 5 second videos that I would like to play at 15, 30, or 60 FPS. This would be an option to the user.
I did find a frameDuration property in the AVVideoComposition class. But all this did was adjust how many frames rendered per second.
回答1:
Similar question here
There is a rate property in the AVPlayer. It worked very well from me. 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.
Bye,
Jean
来源：https://stackoverflow.com/questions/4857409/adjust-avplayer-frame-rate-during-playback