"_CMTimeGetSeconds",symbol(s) not found for architecture armv7 -IOS

Question

By using this Code

AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:selectedVideoUrl];
CMTime duration = playerItem.duration;
float seconds = CMTimeGetSeconds(duration);
NSLog(@"duration: %.2f", seconds);

Error

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)

Answer 1

CMTime is defined in the CoreMedia.framework. Add that framework to your project.

And take a look at Apple's CMTime reference