摘要：
AVFoundationframeworkCoreMediaframework+ (UIImage*) thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time { AVURLAsset *asset = [[[AVURLAsset alloc] initWithURL:videoURL options:nil] autorelease]; NSParameterAssert(asset); AVAssetImageGenerator *assetImageGenerator = [[[AVAssetImageGe 阅读全文