How to find the start and end duration of "Selected frames" from Video using didFinishPickingMediaWithInfo?

I am doing slow motion in audio and video using AVFoundation(for Video) and Dirac(Audio). As part of it, i will show the video as frames in which the user will select the frames to do slow motion. Eg: 5-6 min of 10 min video.
I have to show the users two kinds of videos 1. through the video recorder from my application itself. 2. from the gallery.
Case1: No problem Now,i can record the videos though my video recorder and show the videos as frames to the user to select. Once the user selects some frames(Eg: 5 to 6 min of 10 min recorded video), using the below code, i am able to find the start/end duration of the selected frames or video.
NSNumber *start = [info objectForKey:@"_UIImagePickerControllerVideoEditingStart"]; NSNumber *end = [info objectForKey:@"_UIImagePickerControllerVideoEditingEnd"];  int startMilliseconds = ([start doubleValue] * 1000);int endMilliseconds = ([end doubleValue] * 1000);
Case2: In this case, i am able to pick the video from the gallery and show them to the user in the form of frames to select. However, when i try to find the start/end duration of the video as i did in case 1 with the same code, its not working. I am always getting "0" for start/end duration.
Can you please give some suggestion on my Issue ?

+1 .. also. i'd to know is using "_UIImagePickerControllerVideoEditingStart"
the app won't be rejected..
thanks,
F

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