所以我有这个基本的视频录制应用程序工作，但我想知道如何设置视频捕获的帧速率（我认为这是正确的术语），所以当在屏幕上查看相机提要时，也因为录制时捕获的捕获率会降低，以达到缓慢的模糊效果？
到目前为止，我的代码是：HEADER
// ViewController.h
// VideoTest
//
//
#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
#import <MobileCoreServices/MobileCoreServices.h>
@interface ViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
@property (copy, nonatomic) NSURL *movieURL;
@property (strong, nonatomic) MPMoviePlayerController *movieController;
- (IBAction)takeVideo:(UIButton *)sender;
@end
实现：
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
// Check if the unit has a camera
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Oops"
message:@"Sorry but this device has no camera."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[myAlertView show];
}else{
[super viewDidLoad];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
// Capture Video Action
- (IBAction)takeVideo:(UIButton *)sender {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
[self presentViewController:picker animated:YES completion:NULL];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
self.movieURL = info[UIImagePickerControllerMediaURL];
[picker dismissViewControllerAnimated:YES completion:NULL];
}
// Recording Cancelled
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:NULL];
}
- (void)viewDidAppear:(BOOL)animated {
self.movieController = [[MPMoviePlayerController alloc] init];
[self.movieController setContentURL:self.movieURL];
[self.movieController.view setFrame:CGRectMake (0, 0, 320, 476)];
[self.view addSubview:self.movieController.view];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePlayBackDidFinish:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:self.movieController];
[self.movieController play];
}
// Playback ended
- (void)moviePlayBackDidFinish:(NSNotification *)notification {
[[NSNotificationCenter defaultCenter]removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
[self.movieController stop];
[self.movieController.view removeFromSuperview];
self.movieController = nil;
}
@end