相关疑难解决方法(0)

从我所读到的苹果不暴露api允许开发人员使用当前的sdk获取电影的缩略图.

任何人都可以分享一些关于他们如何处理这个问题的代码吗？我听说你可以访问相机选择器视图,并在ui图像选择器关闭之前找到图像视图.这看起来有点难看.

我还考虑过使用ffmpeg从电影中抓取一个帧但是不知道如何将其编译为iphone的库.任何指针都将非常感激

谁能告诉我如何从视频中提取图像？我到现在为止尝试的是我遵循这些:

• 获取iPhone视频缩略图
• 从iPhone SDK中的视频网址或数据中获取缩略图
• 如何从iPhone SDK中的视频中提取屏幕截图？
• iPhone使用AVFoundation从视频读取UIimage(帧),iphone sdk> 3.0.视频缩略图？

之后我做了这个:

源代码:

- (void)viewDidLoad
{
    videoPicker = [[UIImagePickerController alloc] init];
    [videoPicker setDelegate:self];
    videoPicker.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary;
    NSArray *mediaTypesAllowed = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    videoPicker.mediaTypes = mediaTypesAllowed;
    videoPicker.view.hidden = YES;
}


-(IBAction)imgPickerController
{
    [self presentModalViewController:videoPicker animated:YES];
    videoPicker.view.hidden = NO;
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    // e.g.
    NSString *tempFilePath = [(NSURL *)[info valueForKey:UIImagePickerControllerMediaURL] absoluteString];

    NSLog(@"didFinishPickingMediaWithInfo: %@",tempFilePath);

    // e.g. /private/var/mobile/Applications/D1E784A4-EC1A-402B-81BF-F36D3A08A332/tmp/capture/capturedvideo.MOV
    tempFilePath = [tempFilePath substringFromIndex:16];

    NSLog(@"didFinishPickingMediaWithInfo: %@",tempFilePath);
    NSLog(@"===Try to save video to camera roll.==="); …