如何在转换为video的同时对图像进行animation处理

我想平滑地将图像制作成animation，同时将它们转换为video。 尽pipe如此，我无法理解如何实现它。 我试图改变旋转angular度（CGAffineTransformRotation），翻译和缩放，但没有find一种方法来平滑的animation。 inheritance人如何将照片数组转换为video：

- (void)createVideoWithArrayImages:(NSMutableArray*)images size:(CGSize)size time:(float)time output:(NSURL*)output { //getting a random path NSError *error; AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:output fileType:AVFileTypeMPEG4 error: &error]; NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:size.width], AVVideoWidthKey, [NSNumber numberWithInt:size.height], AVVideoHeightKey, nil]; AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings]; AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput: videoWriterInput sourcePixelBufferAttributes:nil]; videoWriterInput.expectsMediaDataInRealTime = YES; [videoWriter addInput: videoWriterInput]; [videoWriter startWriting]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; CVPixelBufferRef buffer = NULL; //convert uiimage to CGImage. //convert uiimage to CGImage. NSInteger fps = 30; int frameCount = 0; for(UIImage *img in images) { //for(VideoFrame * frm in imageArray) NSLog(@"**************************************************"); //UIImage * img = frm._imageFrame; buffer = [self videoPixelBufferFromCGImage:[img CGImage] andSize:size andAngle:(int)[images indexOfObject:img]]; double numberOfSecondsPerFrame = time / images.count; double frameDuration = fps * numberOfSecondsPerFrame; BOOL append_ok = NO; int j = 0; while (!append_ok && j < fps) { if (adaptor.assetWriterInput.readyForMoreMediaData) { //print out status: NSLog(@"Processing video frame (%d,%d)",frameCount,(int)[images count]); CMTime frameTime = CMTimeMake(frameCount * frameDuration,(int32_t) fps); NSLog(@"Frame Time : %f", CMTimeGetSeconds(frameTime)); append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime]; if(!append_ok) { NSError *error = videoWriter.error; if(error!=nil) { NSLog(@"Unresolved error %@,%@.", error, [error userInfo]); } } } else { printf("adaptor not ready %d, %d\n", frameCount, j); [NSThread sleepForTimeInterval:0.1]; } j++; } if (!append_ok) { printf("error appending image %d times %d\n, with error.", frameCount, j); } frameCount++; NSLog(@"**************************************************"); } [videoWriterInput markAsFinished]; [videoWriter finishWriting]; videoWriter = nil; if(buffer != NULL) CVPixelBufferRelease(buffer); NSLog(@"************ write standard video successful ************"); } 

这里返回CVPixelBufferRef ，如下所示：

 - (CVPixelBufferRef)videoPixelBufferFromCGImage: (CGImageRef) image andSize:(CGSize) size andAngle:(int)angle { NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey, [NSNumber numberWithBool:YES],kCVPixelBufferCGBitmapContextCompatibilityKey, nil]; CVPixelBufferRef pxbuffer = NULL; CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, size.width, size.height, kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options, &pxbuffer); NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL); CVPixelBufferLockBaseAddress(pxbuffer, 0); void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer); NSParameterAssert(pxdata != NULL); CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(pxdata, size.width, size.height, 8, 4*size.width, rgbColorSpace, kCGImageAlphaPremultipliedFirst); NSParameterAssert(context); CGContextConcatCTM(context, CGAffineTransformMakeRotation(0)); CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), image); CGColorSpaceRelease(rgbColorSpace); CGContextRelease(context); CVPixelBufferUnlockBaseAddress(pxbuffer, 0); return pxbuffer; } 

我试着把翻译添加到CVPixelBufferRef，但事情并没有为我工作。 任何指导，任何帮助将是非常有用的。

Answer 1

你没有指定你想要达到什么目的，但我已经使用AVVideoCompositionCoreAnimationTool将animationCALayers包含在AVMutableVideoComposition中。

这是对这个类的引用

希望有所帮助！