试图理解 CMTime 和 CMTimeMake [英] Trying to understand CMTime and CMTimeMake

问题描述

1) CMTimeMake(1,10) 表示持续时间为 1 秒，时间刻度为 10，即每秒 10 帧.这意味着 1s 时长的 10 帧视频?

1) CMTimeMake(1,10) means duration of 1 second and timescale of 10, or 10 frames per second. This means 1s duration of video with 10 frames?

2)

CMTime lastTime=CMTimeMake(1,10);
CMTime frameTime=CMTimeMake(1, 10);
CMTime currentTime=CMTimeAdd(lastTime, frameTime)

= (2, 10) ?

= (2, 10) ?

2 秒的视频和每秒 10 帧的当前时间?

2 seconds of video and with 10 frames per second of the currentTime?

推荐答案

1) CMTimeMake(1,10) 实际上表示值为 1 和时间刻度为 10.它们是分子和分母，所以是 1/10 秒，而不是 1 秒.

1) CMTimeMake(1,10) actually means a value of 1 and a timescale of 10. They are a numerator and denominator, so it is 1/10 of a second, not 1 second.

2) 结果将类似于 CMTimeMake(2, 10)，即 2/10 秒.

2) The result will be like CMTimeMake(2, 10), which is 2/10ths of a second.

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