我正在使用CodenameOne创建一个应用程序,并且必须使用ios本机界面来生成一些视频缩略图。这是我在iOS中使用的代码:

-(NSData*)createThumbnailFromMp4:(NSString*)param{

     NSURL *mediaURL = [NSURL fileURLWithPath:param];
     AVAsset *asset = [AVAsset assetWithURL:mediaURL];
     CMTime duration = [asset duration];
     CMTime snapshot = CMTimeMake(duration.value / 2, duration.timescale);

     AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
     CGImageRef imageRef = [imageGenerator copyCGImageAtTime:snapshot actualTime:nil error:nil];
     UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
     CGImageRelease(imageRef);

     return UIImagePNGRepresentation(thumbnail);
}

传入的参数是视频的完整路径,但是当我将其称为0长度byte []时,我得到的全部信息。这是CodenameOne中的代码:
byte[] thumbnailImage = tg.createThumbnailFromMp4(FileSystemStorage.getInstance().getAppHomePath() + movePath);

其中movePath只是本地存储视频的文件名。

最佳答案

 AVAsset *asset = [AVAsset assetWithURL:urlvideo];
 AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
 CMTime time = [asset duration];
 time.value = 1000 ;
 CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
 image1 = [UIImage imageWithCGImage:imageRef];

10-04 23:41