首先大家先添加AVFoundation和CoreMedia.framework两个框架
* 第一种本地视频获取缩略图
NSString *path = @"www.51ios.net/本地路径"
MPMoviePlayerController *51iosMPMovie = [[MPMoviePlayerController alloc]
initWithContentURL:[NSURL fileURLWithPath:path]];
UIImage *img = [51iosMPMovie thumbnailImageAtTime:0.0
timeOption:MPMovieTimeOptionNearestKeyFrame];

此处的img就是时间在0.0的缩略图
* 第二种获取网络视频的缩略图
NSString *videoURL = @"http://www.51ios.net/archives/784"

MPMoviePlayerController *51iosMPMovie = [[MPMoviePlayerController alloc]initWithContentURL:videoURL]; 51iosMPMovie.shouldAutoplay = NO;
UIImage *thumbnail = [51iosMPMovie thumbnailImageAtTime:time timeOption:MPMovieTimeOptionNearestKeyFrame];

此处的thumbnail就是网络视频的缩略图
* 第三站方法用AVFoundation实现
+(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;
}

首先大家先添加AVFoundation和CoreMedia.framework两个框架
* 第一种本地视频获取缩略图
NSString *path = @"www.51ios.net/本地路径"
MPMoviePlayerController *51iosMPMovie = [[MPMoviePlayerController alloc]
initWithContentURL:[NSURL fileURLWithPath:path]];
UIImage *img = [51iosMPMovie thumbnailImageAtTime:0.0
timeOption:MPMovieTimeOptionNearestKeyFrame];

此处的img就是时间在0.0的缩略图
* 第二种获取网络视频的缩略图
NSString *videoURL = @"http://www.51ios.net/archives/784"

MPMoviePlayerController *51iosMPMovie = [[MPMoviePlayerController alloc]initWithContentURL:videoURL]; 51iosMPMovie.shouldAutoplay = NO;
UIImage *thumbnail = [51iosMPMovie thumbnailImageAtTime:time timeOption:MPMovieTimeOptionNearestKeyFrame];

此处的thumbnail就是网络视频的缩略图
* 第三站方法用AVFoundation实现
+(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;
}