使用此代码
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:selectedVideoUrl];
CMTime duration = playerItem.duration;
float seconds = CMTimeGetSeconds(duration);
NSLog(@"duration: %.2f", seconds);
错误
Undefined symbols for architecture armv7:
"_CMTimeGetSeconds", referenced from:
-[VideoUpload imagePickerController:didFinishPickingMediaWithInfo:] in VideoUpload.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)