- [mImageGenerator generateCGImagesAsynchronouslyForTimes:[NSArray arrayWithObject:[NSValue valueWithCMTime:CMTimeMakeWithSeconds(time, NSEC_PER_SEC)]] completionHandler:
- ^(CMTime requestedTime, CGImageRef image, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error)
- {
- NSLog(@"actual got image at time:%f", CMTimeGetSeconds(actualTime));
- if (image)
- {
- [CATransaction begin];
- [CATransaction setDisableActions:YES];
- [layer setContents:(id)image];
- //UIImage *img = [UIImage imageWithCGImage:image];
- //UIImageWriteToSavedPhotosAlbum(img, self, nil, nil);
- [CATransaction commit];
- }
- }];
如何取得第一帧
AVFoundationframework
CoreMediaframework
- + (UIImage*) thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time {
- AVURLAsset *asset = [[[AVURLAsset alloc] initWithURL:videoURL options:nil] autorelease];
- NSParameterAssert(asset);
- AVAssetImageGenerator *assetImageGenerator = [[[AVAssetImageGenerator alloc] initWithAsset:asset] autorelease];
- assetImageGenerator.appliesPreferredTrackTransform = YES;
- assetImageGenerator.apertureMode = AVAssetImageGeneratorApertureModeEncodedPixels;
- CGImageRef thumbnailImageRef = NULL;
- CFTimeInterval thumbnailImageTime = time;
- NSError *thumbnailImageGenerationError = nil;
- thumbnailImageRef = [assetImageGenerator copyCGImageAtTime:CMTimeMake(thumbnailImageTime, 60) actualTime:NULL error:&thumbnailImageGenerationError];
- if (!thumbnailImageRef)
- NSLog(@"thumbnailImageGenerationError %@", thumbnailImageGenerationError);
- UIImage *thumbnailImage = thumbnailImageRef ? [[[UIImage alloc] initWithCGImage:thumbnailImageRef] autorelease] : nil;
- return thumbnailImage;
