Swift | Creating video out of image array - ios

Question

I build a App, where user can make a Video of a few images.
I took the code from this post: Making video from UIImage array with different transition animations
Everything is working fine, but I have one big problem and I don't know how to solve it.
When the video was created, the image is not filling the hole screen and sometimes it turns to another side or the image is cut in half.
First image is the original image and the second image is the created video with the problems I have.
I really need some help.
var outputSize = CGSize(width: 1920 , height: 1280)
var imagesPerSecond: TimeInterval = 0
var fps: Int32 = 0
var selectedPhotosArray = [UIImage]()
var imageArrayToVideoURL = NSURL()
var asset: AVAsset!
var imageCount = 1
My Code
func buildVideoFromImageArray() {
for image in arrayOfImages {
selectedPhotosArray.append(image)
}
imageArrayToVideoURL = NSURL(fileURLWithPath: NSHomeDirectory() + "/Documents/video1.MP4")
removeFileAtURLIfExists(url: imageArrayToVideoURL)
guard let videoWriter = try? AVAssetWriter(outputURL: imageArrayToVideoURL as URL, fileType: AVFileType.mp4) else {
fatalError("AVAssetWriter error")
}
let outputSettings = [AVVideoCodecKey : AVVideoCodecType.h264, AVVideoWidthKey : NSNumber(value: Float(outputSize.width)), AVVideoHeightKey : NSNumber(value: Float(outputSize.height))] as [String : Any]
guard videoWriter.canApply(outputSettings: outputSettings, forMediaType: AVMediaType.video) else {
fatalError("Negative : Can't applay the Output settings...")
}
let videoWriterInput = AVAssetWriterInput(mediaType: AVMediaType.video, outputSettings: outputSettings)
let sourcePixelBufferAttributesDictionary = [kCVPixelBufferPixelFormatTypeKey as String : NSNumber(value: kCVPixelFormatType_32ARGB), kCVPixelBufferWidthKey as String: NSNumber(value: Float(outputSize.width)), kCVPixelBufferHeightKey as String: NSNumber(value: Float(outputSize.height))]
let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
if videoWriter.canAdd(videoWriterInput) {
videoWriter.add(videoWriterInput)
}
if videoWriter.startWriting() {
let zeroTime = CMTimeMake(value: Int64(imagesPerSecond),timescale: self.fps)
videoWriter.startSession(atSourceTime: zeroTime)
assert(pixelBufferAdaptor.pixelBufferPool != nil)
let media_queue = DispatchQueue(label: "mediaInputQueue")
videoWriterInput.requestMediaDataWhenReady(on: media_queue, using: { () -> Void in
//let fps: Int32 = 1
let framePerSecond: Int64 = Int64(self.imagesPerSecond)
let frameDuration = CMTimeMake(value: Int64(self.imagesPerSecond), timescale: self.fps)
var frameCount: Int64 = 0
var appendSucceeded = true
while (!self.selectedPhotosArray.isEmpty) { // wird so lange ausgeführt, bis noch etwas im Array steht
if (videoWriterInput.isReadyForMoreMediaData) {
let nextPhoto = self.selectedPhotosArray.remove(at: 0) // foto wird aus dem selectedPhotosArray gelöscht
let lastFrameTime = CMTimeMake(value: frameCount * framePerSecond, timescale: self.fps)
let presentationTime = frameCount == 0 ? lastFrameTime : CMTimeAdd(lastFrameTime, frameDuration)
var pixelBuffer: CVPixelBuffer? = nil
let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferAdaptor.pixelBufferPool!, &pixelBuffer)
if let pixelBuffer = pixelBuffer, status == 0 {
let managedPixelBuffer = pixelBuffer
CVPixelBufferLockBaseAddress(managedPixelBuffer, CVPixelBufferLockFlags(rawValue: CVOptionFlags(0)))
let data = CVPixelBufferGetBaseAddress(managedPixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGContext(data: data, width: Int(self.outputSize.width), height: Int(self.outputSize.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(managedPixelBuffer), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue)
context!.clear(CGRect(x: 0, y: 0, width: CGFloat(self.outputSize.width), height: CGFloat(self.outputSize.height)))
let horizontalRatio = CGFloat(self.outputSize.width) / nextPhoto.size.width
let verticalRatio = CGFloat(self.outputSize.height) / nextPhoto.size.height
//let aspectRatio = max(horizontalRatio, verticalRatio) // ScaleAspectFill
let aspectRatio = min(horizontalRatio, verticalRatio) // ScaleAspectFit
let newSize: CGSize = CGSize(width: nextPhoto.size.width * aspectRatio, height: nextPhoto.size.height * aspectRatio)
let x = newSize.width < self.outputSize.width ? (self.outputSize.width - newSize.width) / 2 : 0
let y = newSize.height < self.outputSize.height ? (self.outputSize.height - newSize.height) / 2 : 0
context?.draw(nextPhoto.cgImage!, in: CGRect(x: x, y: y, width: newSize.width, height: newSize.height))
CVPixelBufferUnlockBaseAddress(managedPixelBuffer, CVPixelBufferLockFlags(rawValue: CVOptionFlags(0)))
appendSucceeded = pixelBufferAdaptor.append(pixelBuffer, withPresentationTime: presentationTime)
} else {
print("Failed to allocate pixel buffer")
appendSucceeded = false
}
}
if !appendSucceeded {
break
}
frameCount += 1
}
videoWriterInput.markAsFinished()
videoWriter.finishWriting { () -> Void in
print("-----video1 url = \(self.imageArrayToVideoURL)")
//self.asset = AVAsset(url: self.imageArrayToVideoURL as URL)
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: self.imageArrayToVideoURL as URL)
}) { saved, error in
if saved {
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
let fetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions).firstObject
// fetchResult is your latest video PHAsset
// To fetch latest image replace .video with .image
}
}
}
})
}
}
func removeFileAtURLIfExists(url: NSURL) {
if let filePath = url.path {
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath) {
do{
try fileManager.removeItem(atPath: filePath)
} catch let error as NSError {
print("Couldn't remove existing destination file: \(error)")
}
}
}
}`