从相机胶卷的图像创buildvideo – iOS sdk

我已经使用以下代码从图像创buildvideo。

此代码工作正常时，我从相机胶卷从网上下载或从屏幕截图中select的图像，但从相机显示放大在电影中select的图像。

我不知道相机的图像有什么问题。

任何人都可以请帮我解决这个问题。

-(IBAction)createV:(id)sender { NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"]; CGSize imageSize = [DatabaseAccess getusersetsize]; double nospf =[[[NSUserDefaults standardUserDefaults] valueForKey:@"duration"] intValue]; NSUInteger fps = 10; NSMutableArray *imageArray;// = [DatabaseAccess getimagelist:@"select imgname from tbl_userimage"]; NSArray* imagePaths = [DatabaseAccess getimagelist:@"select imgname,strftime('%d-%m-%Y', tdate) as tdate from tbl_userimage"]; imageArray = [[NSMutableArray alloc] initWithCapacity:imagePaths.count]; int i=0; for (NSString* path in [imagePaths valueForKey:@"image"] ) { if ([[NSUserDefaults standardUserDefaults] boolForKey:@"disdate"]) { CGSize imgsize = [DatabaseAccess getusersetsize]; //[imageArray addObject:[[DatabaseAccess drawText:[[imagePaths valueForKey:@"date"] objectAtIndex:i] inImage:[UIImage imageWithContentsOfFile:[DatabaseAccess documentsPathForFileName:path]] atPoint:CGPointMake(imgsize.width-250,imgsize.height-60) ] fixOrientation]]; [imageArray addObject:[DatabaseAccess drawText:[[imagePaths valueForKey:@"date"] objectAtIndex:i] inImage:[UIImage imageWithContentsOfFile:[DatabaseAccess documentsPathForFileName:path]] atPoint:CGPointMake(imgsize.width-250,imgsize.height-60) ]]; } else { [imageArray addObject:[UIImage imageWithContentsOfFile:[DatabaseAccess documentsPathForFileName:path]]]; NSLog(@"%@",path); // [imageArray addObject:[UIImage imageNamed:path]]; } i++; } [self exportImages:imageArray asVideoToPath:videoOutputPath withFrameSize:imageSize framesPerSecond:fps numberOfSecondsPerFrame:nospf]; } - (void)exportImages:(NSMutableArray *)imageArray asVideoToPath:(NSString *)videoOutputPath withFrameSize:(CGSize)imageSize framesPerSecond:(NSUInteger)fps numberOfSecondsPerFrame:(double)numberOfSecondsPerFrame { NSError *error = nil; NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSFileManager *fileMgr = [NSFileManager defaultManager]; if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES) NSLog(@"Unable to delete file: %@", [error localizedDescription]); ////////////// end setup /////////////////////////////////// NSLog(@"Start building video from defined frames."); AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: [NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeMPEG4 error:&error]; NSParameterAssert(videoWriter); NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:imageSize.width], AVVideoWidthKey, [NSNumber numberWithInt:imageSize.height], AVVideoHeightKey, nil]; AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings]; AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:nil]; NSParameterAssert(videoWriterInput); NSParameterAssert([videoWriter canAddInput:videoWriterInput]); videoWriterInput.expectsMediaDataInRealTime = YES; [videoWriter addInput:videoWriterInput]; //Start a session: [videoWriter startWriting]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; CVPixelBufferRef buffer = NULL; //convert uiimage to CGImage. int frameCount = 0; //double numberOfSecondsPerFrame = 6; double frameDuration = fps * numberOfSecondsPerFrame; //for(VideoFrame * frm in imageArray) NSLog(@"**************************************************"); for(UIImage * img in imageArray) { //UIImage * img = frm._imageFrame; buffer = [self pixelBufferFromCGImage:[img CGImage]]; BOOL append_ok = NO; int j = 0; while (!append_ok && j < 30) { if (adaptor.assetWriterInput.readyForMoreMediaData) { //print out status: NSLog(@"Processing video frame (%d,%lu)",frameCount,(unsigned long)[imageArray count]); CMTime frameTime = CMTimeMake(frameCount,(int32_t) numberOfSecondsPerFrame); //CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps); // NSLog(@"%@",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(@"**************************************************"); //Finish the session: [videoWriterInput markAsFinished]; [videoWriter finishWriting]; NSLog(@"Write Ended"); [self playMovie:videoOutputPath]; } - (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image { // CGSize size = CGSizeMake(400, 200); CGSize size = [DatabaseAccess getusersetsize]; 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); if (status != kCVReturnSuccess){ NSLog(@"Failed to create pixel buffer"); } CVPixelBufferLockBaseAddress(pxbuffer, 0); void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer); CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(pxdata, size.width, size.height, 8, 4*size.width, rgbColorSpace, kCGImageAlphaPremultipliedFirst); //kCGImageAlphaNoneSkipFirst); NSParameterAssert(context); //CGContextConcatCTM(context, frameTransform); CGContextConcatCTM(context, CGAffineTransformMakeRotation(0)); CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image); CGColorSpaceRelease(rgbColorSpace); CGContextRelease(context); CVPixelBufferUnlockBaseAddress(pxbuffer, 0); return pxbuffer; } 

Answer 1

我已经解决了使用此代码的img放大问题

 -(UIImage*) scaleImage: (UIImage*)image toSize:(CGSize)newSize { UIGraphicsBeginImageContext(newSize); [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newImage; } 

调整UIImage的大小，将其转换为CGImage，确保将image.width的大小调整为16的倍数。

  CGSize your_size = CGSizeMake(1600, 800); UIImage *tempImg = [self scaleImage:img toSize:your_size..]; buffer = [self pixelBufferFromCGImage:[tempImg CGImage]];