如何將UIImage數組導出為電影？我有一個嚴重的問題：我有一個NSArray有幾個UIImage物品。我現在想做的是用那些UIImages..但我不知道該怎么做。我希望有人能幫我，或者給我發一個代碼片段，做一些我想做的事情。編輯：供今后參考-在應用解決方案后，如果視頻看起來失真，請確保所捕獲的圖像/區域的寬度為16倍。在此經過幾個小時的掙扎后發現：為什么我的電影“UIImage”會被歪曲？以下是完整的解決方案(只需確保寬度為16的倍數)http：/codeThink.no-ip.org/WordPress/files/673
3 回答
jeck貓
TA貢獻1909條經驗 獲得超7個贊
注：這是一個SWIFT 2.1解決方案(iOS 8+，XCode 7.2).
loadImages()RenderSettings
第1部分：設置
RenderSettings
import AVFoundationimport UIKitimport Photosstruct RenderSettings {
var width: CGFloat = 1280
var height: CGFloat = 720
var fps: Int32 = 2 // 2 frames per second
var avCodecKey = AVVideoCodecH264
var videoFilename = "render"
var videoFilenameExt = "mp4"
var size: CGSize {
return CGSize(width: width, height: height)
}
var outputURL: NSURL {
// Use the CachesDirectory so the rendered video file sticks around as long as we need it to.
// Using the CachesDirectory ensures the file won't be included in a backup of the app.
let fileManager = NSFileManager.defaultManager()
if let tmpDirURL = try? fileManager.URLForDirectory(.CachesDirectory, inDomain: .UserDomainMask, appropriateForURL:
nil, create: true) {
return tmpDirURL.URLByAppendingPathComponent(videoFilename).URLByAppendingPathExtension(videoFilenameExt)
}
fatalError("URLForDirectory() failed")
}}第二部分：圖像動畫
ImageAnimatorVideoWritersaveToLibrary()
class ImageAnimator {
// Apple suggests a timescale of 600 because it's a multiple of standard video rates 24, 25, 30, 60 fps etc.
static let kTimescale: Int32 = 600
let settings: RenderSettings
let videoWriter: VideoWriter
var images: [UIImage]!
var frameNum = 0
class func saveToLibrary(videoURL: NSURL) {
PHPhotoLibrary.requestAuthorization { status in
guard status == .Authorized else { return }
PHPhotoLibrary.sharedPhotoLibrary().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
}) { success, error in
if !success {
print("Could not save video to photo library:", error)
}
}
}
}
class func removeFileAtURL(fileURL: NSURL) {
do {
try NSFileManager.defaultManager().removeItemAtPath(fileURL.path!)
}
catch _ as NSError {
// Assume file doesn't exist.
}
}
init(renderSettings: RenderSettings) {
settings = renderSettings
videoWriter = VideoWriter(renderSettings: settings)
images = loadImages()
}
func render(completion: ()->Void) {
// The VideoWriter will fail if a file exists at the URL, so clear it out first.
ImageAnimator.removeFileAtURL(settings.outputURL)
videoWriter.start()
videoWriter.render(appendPixelBuffers) {
ImageAnimator.saveToLibrary(self.settings.outputURL)
completion()
}
}
// Replace this logic with your own.
func loadImages() -> [UIImage] {
var images = [UIImage]()
for index in 1...10 {
let filename = "\(index).jpg"
images.append(UIImage(named: filename)!)
}
return images }
// This is the callback function for VideoWriter.render()
func appendPixelBuffers(writer: VideoWriter) -> Bool {
let frameDuration = CMTimeMake(Int64(ImageAnimator.kTimescale / settings.fps), ImageAnimator.kTimescale)
while !images.isEmpty {
if writer.isReadyForData == false {
// Inform writer we have more buffers to write.
return false
}
let image = images.removeFirst()
let presentationTime = CMTimeMultiply(frameDuration, Int32(frameNum))
let success = videoWriter.addImage(image, withPresentationTime: presentationTime)
if success == false {
fatalError("addImage() failed")
}
frameNum++
}
// Inform writer all buffers have been written.
return true
}}第3部分：錄影作家
VideoWriterAVAssetWriterAVAssetWriterInputCVPixelBuffer.
class VideoWriter {
let renderSettings: RenderSettings
var videoWriter: AVAssetWriter!
var videoWriterInput: AVAssetWriterInput!
var pixelBufferAdaptor: AVAssetWriterInputPixelBufferAdaptor!
var isReadyForData: Bool {
return videoWriterInput?.readyForMoreMediaData ?? false
}
class func pixelBufferFromImage(image: UIImage, pixelBufferPool: CVPixelBufferPool, size: CGSize) -> CVPixelBuffer {
var pixelBufferOut: CVPixelBuffer?
let status = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferPool, &pixelBufferOut)
if status != kCVReturnSuccess {
fatalError("CVPixelBufferPoolCreatePixelBuffer() failed")
}
let pixelBuffer = pixelBufferOut!
CVPixelBufferLockBaseAddress(pixelBuffer, 0)
let data = CVPixelBufferGetBaseAddress(pixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGBitmapContextCreate(data, Int(size.width), Int(size.height),
8, CVPixelBufferGetBytesPerRow(pixelBuffer), rgbColorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue)
CGContextClearRect(context, CGRectMake(0, 0, size.width, size.height))
let horizontalRatio = size.width / image.size.width let verticalRatio = size.height / image.size.height
//aspectRatio = max(horizontalRatio, verticalRatio) // ScaleAspectFill
let aspectRatio = min(horizontalRatio, verticalRatio) // ScaleAspectFit
let newSize = CGSize(width: image.size.width * aspectRatio, height: image.size.height * aspectRatio)
let x = newSize.width < size.width ? (size.width - newSize.width) / 2 : 0
let y = newSize.height < size.height ? (size.height - newSize.height) / 2 : 0
CGContextDrawImage(context, CGRectMake(x, y, newSize.width, newSize.height), image.CGImage)
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0)
return pixelBuffer }
init(renderSettings: RenderSettings) {
self.renderSettings = renderSettings }
func start() {
let avOutputSettings: [String: AnyObject] = [
AVVideoCodecKey: renderSettings.avCodecKey,
AVVideoWidthKey: NSNumber(float: Float(renderSettings.width)),
AVVideoHeightKey: NSNumber(float: Float(renderSettings.height))
]
func createPixelBufferAdaptor() {
let sourcePixelBufferAttributesDictionary = [
kCVPixelBufferPixelFormatTypeKey as String: NSNumber(unsignedInt: kCVPixelFormatType_32ARGB),
kCVPixelBufferWidthKey as String: NSNumber(float: Float(renderSettings.width)),
kCVPixelBufferHeightKey as String: NSNumber(float: Float(renderSettings.height))
]
pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput,
sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
}
func createAssetWriter(outputURL: NSURL) -> AVAssetWriter {
guard let assetWriter = try? AVAssetWriter(URL: outputURL, fileType: AVFileTypeMPEG4) else {
fatalError("AVAssetWriter() failed")
}
guard assetWriter.canApplyOutputSettings(avOutputSettings, forMediaType: AVMediaTypeVideo) else {
fatalError("canApplyOutputSettings() failed")
}
return assetWriter }
videoWriter = createAssetWriter(renderSettings.outputURL)
videoWriterInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: avOutputSettings)
if videoWriter.canAddInput(videoWriterInput) {
videoWriter.addInput(videoWriterInput)
}
else {
fatalError("canAddInput() returned false")
}
// The pixel buffer adaptor must be created before we start writing.
createPixelBufferAdaptor()
if videoWriter.startWriting() == false {
fatalError("startWriting() failed")
}
videoWriter.startSessionAtSourceTime(kCMTimeZero)
precondition(pixelBufferAdaptor.pixelBufferPool != nil, "nil pixelBufferPool")
}
func render(appendPixelBuffers: (VideoWriter)->Bool, completion: ()->Void) {
precondition(videoWriter != nil, "Call start() to initialze the writer")
let queue = dispatch_queue_create("mediaInputQueue", nil)
videoWriterInput.requestMediaDataWhenReadyOnQueue(queue) {
let isFinished = appendPixelBuffers(self)
if isFinished {
self.videoWriterInput.markAsFinished()
self.videoWriter.finishWritingWithCompletionHandler() {
dispatch_async(dispatch_get_main_queue()) {
completion()
}
}
}
else {
// Fall through. The closure will be called again when the writer is ready.
}
}
}
func addImage(image: UIImage, withPresentationTime presentationTime: CMTime) -> Bool {
precondition(pixelBufferAdaptor != nil, "Call start() to initialze the writer")
let pixelBuffer = VideoWriter.pixelBufferFromImage(image, pixelBufferPool: pixelBufferAdaptor.pixelBufferPool!, size:
renderSettings.size)
return pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: presentationTime)
}}第4部分：使之成為現實
let settings = RenderSettings()let imageAnimator = ImageAnimator(renderSettings: settings)imageAnimator.render() {
print("yes")}- 3 回答
- 0 關注
- 626 瀏覽
添加回答
舉報
0/150
提交
取消