Question

我正在使用 AVPlayer 从服务器播放视频。

AVPlayer *player = [AVPlayer playerWithURL:videoURL];
AVPlayerViewController *playerViewController = [AVPlayerViewController new];
playerViewController.player = player;
[self presentViewController:playerViewController animated:YES completion:nil];

现在我想捕捉多个图像，而视频正在播放并保存。我怎么能这样做？？

Answer 1

使用MPMoviePlayerController存在从视频中获取帧的更简单方法。以下代码在time:5

处获取图片

MPMoviePlayerController *movie = [[MPMoviePlayerController alloc]
        initWithContentURL:[NSURL URLWithString:@"someVideo.mp4"]];
UIImage *singleFrameImage = [movie thumbnailImageAtTime:5 
        timeOption:MPMovieTimeOptionExact];

为了从视频中获取多个图像，可以使用以下实现。

1）注册通知，以便在处理每个请求时接收图像。

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(MPMoviePlayerThumbnailImageRequestDidFinishNotification:) name:MPMoviePlayerThumbnailImageRequestDidFinishNotification object:moviePlayer];

2）使用所需的时间初始化MPMoviePlayerController以获取图像。

MPMoviePlayerController *movie = [[MPMoviePlayerController alloc]
        initWithContentURL [NSURL URLWithString:@"someVideo.mp4"]];
NSNumber time1 = 15;
NSNumber time2 = 16;
NSNumber time3 = 17;
NSArray *times = [NSArray arrayWithObjects:time1,time2,time3,nil];
[movie requestThumbnailImagesAtTimes:times timeOption:MPMovieTimeOptionExact];

3）选择器接收图像

-(void)MPMoviePlayerThumbnailImageRequestDidFinishNotification: (NSNotification*)note
{
    NSDictionary * userInfo = [note userInfo];
    UIImage *image = (UIImage *)[userInfo objectForKey:MPMoviePlayerThumbnailImageKey];
}

Answer 2

请使用此代码，您可以使用此

从视频中获取缩略图

AVAsset *asset = [AVAsset assetWithURL:URl];
        AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
        imageGenerator.appliesPreferredTrackTransform=TRUE;
        CMTime time = CMTimeMake(1, 1);
        CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
        UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
        NSData *imagedata = [self compressImage:thumbnail];
        UIImage *imag = [UIImage imageWithData:imagedata];//this is image from video at time interval 1 second

您可以获取多个图像来设置多个时间间隔

在iOS中捕获视频图像

2 个答案: