從iOS中的視頻網(wǎng)址或數(shù)據(jù)中獲取縮略圖我試圖從iphone 3GS相機拍攝的視頻中獲?。ǖ谝粠模┛s略圖，以便我可以顯示它。這該怎么做？
3 回答
暮色呼如
TA貢獻1853條經(jīng)驗 獲得超9個贊
這個問題的答案是，現(xiàn)在可以使用4.0 iOS獲取使用AVFoundation的縮略圖，下面的代碼，其中類屬性url是電影網(wǎng)址，將執(zhí)行操作（您可以隨時獲取縮略圖，在示例中它可以時間0）
-(void)generateImage{
AVURLAsset *asset=[[AVURLAsset alloc] initWithURL:self.url options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generator.appliesPreferredTrackTransform=TRUE;
[asset release];
CMTime thumbTime = CMTimeMakeWithSeconds(0,30);
AVAssetImageGeneratorCompletionHandler handler = ^(CMTime requestedTime, CGImageRef im, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error){
if (result != AVAssetImageGeneratorSucceeded) {
NSLog(@"couldn't generate thumbnail, error:%@", error);
}
[button setImage:[UIImage imageWithCGImage:im] forState:UIControlStateNormal];
thumbImg=[[UIImage imageWithCGImage:im] retain];
[generator release];
};
CGSize maxSize = CGSizeMake(320, 180);
generator.maximumSize = maxSize;
[generator generateCGImagesAsynchronouslyForTimes:[NSArray arrayWithObject:[NSValue valueWithCMTime:thumbTime]] completionHandler:handler];}
慕斯709654
TA貢獻1840條經(jīng)驗 獲得超5個贊
-(UIImage *)generateThumbImage : (NSString *)filepath{
NSURL *url = [NSURL fileURLWithPath:filepath];
AVAsset *asset = [AVAsset assetWithURL:url];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
imageGenerator.appliesPreferredTrackTransform = YES;
CMTime time = [asset duration];
time.value = 0;
CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef); // CGImageRef won't be released by ARC
return thumbnail;}您可以使用time.value獲取幀，假設(shè)您想要1秒幀然后使用
time.value = 1000 //Time in milliseconds
慕標5832272
TA貢獻1966條經(jīng)驗 獲得超4個贊
NSURL *videoURL = [NSURL fileURLWithPath:url];MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:videoURL]; UIImage *thumbnail = [player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame]; //Player autoplays audio on init [player stop]; [player release];
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