如何在Lion上使用AVFoundation确定媒体文件的像素长宽比？

Question

As part of a 64 bit Objective-C program I need to determine some parameters of media files on Lion. For example for a video file, what is the pixel aspect ratio and is the video anamorphic? I've been searching the AVFoundation API with no luck. Any ideas on how to determine this information?

Thanks,

Barrie

Answer 1

尽管我不是AVFoundation专家，但我将开始在视频设置中查看AVVideoWidthKey和AVVideoHeightKey字典键。.请参阅http://developer.apple.com/library/IOs/#documentation/AVFoundation/Reference/AVFoundation_Constants/Reference/reference .html