获取视频的缩略图_vb6 getthumbnaillmage 获得文件缩略图接口-优快云博客

本文链接：https://blog.youkuaiyun.com/WiKi_Su/article/details/49931489

本文介绍如何使用Objective-C获取本地和网络视频的缩略图，包括使用AVFoundation和CoreMedia框架的方法，以及利用MPMoviePlayerController类的快捷方式。详细步骤包括初始化AVURLAsset和AVAssetImageGenerator，指定所需的时间戳来提取关键帧，最后将CGImage转换为UIImage。同时提供两种方法，分别适用于本地和网络视频。

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【1】获取本地视频的缩略图

+(UIImage *)getThumbnailImage:(NSString *)videoURL

{

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:videoURL] options:nil];

AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];

gen.appliesPreferredTrackTransform = YES;

CMTime time = CMTimeMakeWithSeconds(0.0, 600);

NSError *error = nil;

CMTime actualTime;

CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];

UIImage *thumb = [[UIImage alloc] initWithCGImage:image];

CGImageRelease(image);

return thumb;

}

第二种方法

需要添加AVFoundation和CoreMedia.framework

另外一种那个方法

MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:videoURL]; moviePlayer.shouldAutoplay = NO;

UIImage *thumbnail = [moviePlayer thumbnailImageAtTime:time timeOption:MPMovieTimeOptionNearestKeyFrame];

//这个也一样


+(UIImage *)fFirstVideoFrame:(NSString *)path 
{ 
    MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] 
                                   initWithContentURL:[NSURL fileURLWithPath:path]]; 
    UIImage *img = [mp thumbnailImageAtTime:0.0 
                                 timeOption:MPMovieTimeOptionNearestKeyFrame]; 
    [mp stop]; 
    [mp release]; 
    return img; 
}

【2】获取网络视频的缩略图

+ (UIImage *)getImageWihtUrl:(NSString *)videoURL

{

NSDictionary *opts = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];

// NSURL *url = [[[NSURL alloc] initFileURLWithPath:videoURL] autorelease];

NSURL *url=[[NSURL alloc]initWithString:videoURL];

AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:opts];

AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset];

generator.appliesPreferredTrackTransform = YES;

generator.maximumSize = CGSizeMake(240, 150);

NSError *error = nil;

CGImageRef img = [generator copyCGImageAtTime:CMTimeMake(60, 10) actualTime:NULL error:&error];