取消UIImagePicker後獲取視頻的長度？

Question

我想獲得用戶選擇的視頻長度。即時通訊使用蘋果UIImagePicker，

這裏是我到目前爲止的代碼：

[self dismissModalViewControllerAnimated:YES]; 
//assign the mediatype to a string 
//check the media type string so we can determine if its a video 
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL]; 
    webData = [[NSData alloc]init]; 
    webData = [NSData dataWithContentsOfURL:videoURL]; 
    //[self post:webData]; 
    video = 1; 
    upload.hidden = NO; 

    ImagesCopy = [[NSMutableArray alloc]initWithObjects:@"1", nil]; 
[tableview reloadData]; 

感謝：d

Answer 1

你可以做到這一點

AVAsset *movie = [AVAsset assetWithURL:[info objectForKey:UIImagePickerControllerMediaURL]]; 
CMTime movieLength = movie.duration;