iOS：检测电影的长宽比

Question

I am developing a DRM video player using AVPlayer and AVPlayerItem that can play either streamed or plain file movies.

I want to know if it is possible to detect the aspect ratio of the movie so that I can do some pan in / pan out to play the movie with or without the eventual black stripes.

I had a look at CoreMedia Framework, but the is not any real good documentation as most of the methods are not explained.

Do any of you guys have any idea?

Thanks.

Answer 1

实际上，这非常简单：只需使用AVPLayer的videoGravity即可解决。