Comment exporter le tableau UIImage en tant que film?

J'ai un problème sérieux: j'ai un NSArrayavec plusieurs UIImageobjets. Ce que je veux faire maintenant, c'est créer un film à partir de ceux-ci UIImages. Mais je ne sais pas comment faire.

J'espère que quelqu'un pourra m'aider ou m'envoyer un extrait de code qui fait quelque chose comme je veux.

Edit: Pour référence future - Après avoir appliqué la solution, si la vidéo semble déformée, assurez-vous que la largeur des images / de la zone que vous capturez est un multiple de 16. Trouvé après de nombreuses heures de lutte ici:
Pourquoi mon film d'UIImages obtient-il déformé?

Voici la solution complète (assurez-vous simplement que la largeur est multiple de 16)
http://codethink.no-ip.org/wordpress/archives/673

Jetez un œil à AVAssetWriter et au reste du framework AVFoundation . L'enregistreur a une entrée de type AVAssetWriterInput , qui à son tour a une méthode appelée appendSampleBuffer: qui vous permet d'ajouter des images individuelles à un flux vidéo. Essentiellement, vous devrez:

1) Câblez l'écrivain:

NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
    [NSURL fileURLWithPath:somePath] fileType:AVFileTypeQuickTimeMovie
    error:&error];
NSParameterAssert(videoWriter);

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
    AVVideoCodecH264, AVVideoCodecKey,
    [NSNumber numberWithInt:640], AVVideoWidthKey,
    [NSNumber numberWithInt:480], AVVideoHeightKey,
    nil];
AVAssetWriterInput* writerInput = [[AVAssetWriterInput
    assetWriterInputWithMediaType:AVMediaTypeVideo
    outputSettings:videoSettings] retain]; //retain should be removed if ARC

NSParameterAssert(writerInput);
NSParameterAssert([videoWriter canAddInput:writerInput]);
[videoWriter addInput:writerInput];

2) Démarrez une session:

[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:…] //use kCMTimeZero if unsure

3) Écrivez quelques exemples:

// Or you can use AVAssetWriterInputPixelBufferAdaptor.
// That lets you feed the writer input data from a CVPixelBuffer
// that’s quite easy to create from a CGImage.
[writerInput appendSampleBuffer:sampleBuffer];

4) Terminez la session:

[writerInput markAsFinished];
[videoWriter endSessionAtSourceTime:…]; //optional can call finishWriting without specifying endTime
[videoWriter finishWriting]; //deprecated in ios6
/*
[videoWriter finishWritingWithCompletionHandler:...]; //ios 6.0+
*/

Vous devrez toujours remplir beaucoup de blancs, mais je pense que la seule partie qui reste vraiment difficile est d'obtenir un tampon de pixels à partir d'un CGImage:

- (CVPixelBufferRef) newPixelBufferFromCGImage: (CGImageRef) image
{
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
        [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
        [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
        nil];
    CVPixelBufferRef pxbuffer = NULL;
    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, frameSize.width,
        frameSize.height, kCVPixelFormatType_32ARGB, (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, frameSize.width,
        frameSize.height, 8, 4*frameSize.width, rgbColorSpace, 
        kCGImageAlphaNoneSkipFirst);
    NSParameterAssert(context);
    CGContextConcatCTM(context, frameTransform);
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), 
        CGImageGetHeight(image)), image);
    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);

    CVPixelBufferUnlockBaseAddress(pxbuffer, 0);

    return pxbuffer;
}

frameSizeest une CGSizedescription de votre taille de l' image cible et frameTransformest un CGAffineTransformqui vous permet de transformer les images lorsque vous les dessiner dans des cadres.

Voici le dernier code de travail sur iOS8 en Objective-C.

Nous avons dû apporter une variété de modifications à la réponse de @ Zoul ci-dessus pour qu'elle fonctionne sur la dernière version de Xcode et d'iOS8. Voici notre code de travail complet qui prend un tableau d'UIImages, les transforme en fichier .mov, l'enregistre dans un répertoire temporaire, puis le déplace vers la pellicule. Nous avons assemblé le code de plusieurs articles différents pour que cela fonctionne. Nous avons mis en évidence les pièges que nous devions résoudre pour faire fonctionner le code dans nos commentaires.

(1) Créer une collection d'UIImages

[self saveMovieToLibrary]


- (IBAction)saveMovieToLibrary
{
    // You just need the height and width of the video here
    // For us, our input and output video was 640 height x 480 width
    // which is what we get from the iOS front camera
    ATHSingleton *singleton = [ATHSingleton singletons];
    int height = singleton.screenHeight;
    int width = singleton.screenWidth;

    // You can save a .mov or a .mp4 file        
    //NSString *fileNameOut = @"temp.mp4";
    NSString *fileNameOut = @"temp.mov";

    // We chose to save in the tmp/ directory on the device initially
    NSString *directoryOut = @"tmp/";
    NSString *outFile = [NSString stringWithFormat:@"%@%@",directoryOut,fileNameOut];
    NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:outFile]];
    NSURL *videoTempURL = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@%@", NSTemporaryDirectory(), fileNameOut]];

    // WARNING: AVAssetWriter does not overwrite files for us, so remove the destination file if it already exists
    NSFileManager *fileManager = [NSFileManager defaultManager];
    [fileManager removeItemAtPath:[videoTempURL path]  error:NULL];


    // Create your own array of UIImages        
    NSMutableArray *images = [NSMutableArray array];
    for (int i=0; i<singleton.numberOfScreenshots; i++)
    {
        // This was our routine that returned a UIImage. Just use your own.
        UIImage *image =[self uiimageFromCopyOfPixelBuffersUsingIndex:i];
        // We used a routine to write text onto every image 
        // so we could validate the images were actually being written when testing. This was it below. 
        image = [self writeToImage:image Text:[NSString stringWithFormat:@"%i",i ]];
        [images addObject:image];     
    }

// If you just want to manually add a few images - here is code you can uncomment
// NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/movie.mp4"]];
//    NSArray *images = [[NSArray alloc] initWithObjects:
//                      [UIImage imageNamed:@"add_ar.png"],
//                      [UIImage imageNamed:@"add_ja.png"],
//                      [UIImage imageNamed:@"add_ru.png"],
//                      [UIImage imageNamed:@"add_ru.png"],
//                      [UIImage imageNamed:@"add_ar.png"],
//                      [UIImage imageNamed:@"add_ja.png"],
//                      [UIImage imageNamed:@"add_ru.png"],
//                      [UIImage imageNamed:@"add_ar.png"],
//                      [UIImage imageNamed:@"add_en.png"], nil];



    [self writeImageAsMovie:images toPath:path size:CGSizeMake(height, width)];
}

C'est la principale méthode qui crée votre AssetWriter et y ajoute des images pour l'écriture.

(2) Câblez un AVAssetWriter

-(void)writeImageAsMovie:(NSArray *)array toPath:(NSString*)path size:(CGSize)size
{

    NSError *error = nil;

    // FIRST, start up an AVAssetWriter instance to write your video
    // Give it a destination path (for us: tmp/temp.mov)
    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:path]
                                                           fileType:AVFileTypeQuickTimeMovie
                                                              error:&error];


    NSParameterAssert(videoWriter);

    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecH264, AVVideoCodecKey,
                                   [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                                   nil];

    AVAssetWriterInput* writerInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
                                                                         outputSettings:videoSettings];

    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
                                                                                                                     sourcePixelBufferAttributes:nil];
    NSParameterAssert(writerInput);
    NSParameterAssert([videoWriter canAddInput:writerInput]);
    [videoWriter addInput:writerInput];

(3) Démarrez une session d'écriture (REMARQUE: la méthode continue d'en haut)

    //Start a SESSION of writing. 
    // After you start a session, you will keep adding image frames 
    // until you are complete - then you will tell it you are done.
    [videoWriter startWriting];
    // This starts your video at time = 0
    [videoWriter startSessionAtSourceTime:kCMTimeZero];

    CVPixelBufferRef buffer = NULL;

    // This was just our utility class to get screen sizes etc.    
    ATHSingleton *singleton = [ATHSingleton singletons];

    int i = 0;
    while (1)
    {
        // Check if the writer is ready for more data, if not, just wait
        if(writerInput.readyForMoreMediaData){

            CMTime frameTime = CMTimeMake(150, 600);
            // CMTime = Value and Timescale.
            // Timescale = the number of tics per second you want
            // Value is the number of tics
            // For us - each frame we add will be 1/4th of a second
            // Apple recommend 600 tics per second for video because it is a 
            // multiple of the standard video rates 24, 30, 60 fps etc.
            CMTime lastTime=CMTimeMake(i*150, 600);
            CMTime presentTime=CMTimeAdd(lastTime, frameTime);

            if (i == 0) {presentTime = CMTimeMake(0, 600);} 
            // This ensures the first frame starts at 0.


            if (i >= [array count])
            {
                buffer = NULL;
            }
            else
            {
                // This command grabs the next UIImage and converts it to a CGImage
                buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:i] CGImage]];
            }


            if (buffer)
            {
                // Give the CGImage to the AVAssetWriter to add to your video
                [adaptor appendPixelBuffer:buffer withPresentationTime:presentTime];
                i++;
            }
            else
            {

(4) Terminez la session (Remarque: la méthode continue d'en haut)

                //Finish the session:
                // This is important to be done exactly in this order
                [writerInput markAsFinished];
                // WARNING: finishWriting in the solution above is deprecated. 
                // You now need to give a completion handler.
                [videoWriter finishWritingWithCompletionHandler:^{
                    NSLog(@"Finished writing...checking completion status...");
                    if (videoWriter.status != AVAssetWriterStatusFailed && videoWriter.status == AVAssetWriterStatusCompleted)
                    {
                        NSLog(@"Video writing succeeded.");

                        // Move video to camera roll
                        // NOTE: You cannot write directly to the camera roll. 
                        // You must first write to an iOS directory then move it!
                        NSURL *videoTempURL = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@", path]];
                        [self saveToCameraRoll:videoTempURL];

                    } else
                    {
                        NSLog(@"Video writing failed: %@", videoWriter.error);
                    }

                }]; // end videoWriter finishWriting Block

                CVPixelBufferPoolRelease(adaptor.pixelBufferPool);

                NSLog (@"Done");
                break;
            }
        }
    }    
}

(5) Convertissez vos UIImages en CVPixelBufferRef
Cette méthode vous donnera une référence de tampon de pixels CV qui est nécessaire à AssetWriter. Ceci est obtenu à partir d'un CGImageRef que vous obtenez de votre UIImage (ci-dessus).

- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image
{
    // This again was just our utility class for the height & width of the
    // incoming video (640 height x 480 width)
    ATHSingleton *singleton = [ATHSingleton singletons];
    int height = singleton.screenHeight;
    int width = singleton.screenWidth;

    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
                             nil];
    CVPixelBufferRef pxbuffer = NULL;

    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, width,
                                          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, width,
                                                 height, 8, 4*width, rgbColorSpace,
                                                 kCGImageAlphaNoneSkipFirst);
    NSParameterAssert(context);
    CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
                                           CGImageGetHeight(image)), image);
    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);

    CVPixelBufferUnlockBaseAddress(pxbuffer, 0);

    return pxbuffer;
}

(6) Déplacer votre vidéo vers la pellicule Comme AVAssetWriter ne peut pas écrire directement sur la pellicule, cela déplace la vidéo de "tmp / temp.mov" (ou quel que soit le nom de fichier que vous avez nommé ci-dessus) vers la pellicule.

- (void) saveToCameraRoll:(NSURL *)srcURL
{
    NSLog(@"srcURL: %@", srcURL);

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    ALAssetsLibraryWriteVideoCompletionBlock videoWriteCompletionBlock =
    ^(NSURL *newURL, NSError *error) {
        if (error) {
            NSLog( @"Error writing image with metadata to Photo Library: %@", error );
        } else {
            NSLog( @"Wrote image with metadata to Photo Library %@", newURL.absoluteString);
        }
    };

    if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:srcURL])
    {
        [library writeVideoAtPathToSavedPhotosAlbum:srcURL
                                    completionBlock:videoWriteCompletionBlock];
    }
}

La réponse de Zoul ci-dessus donne un joli aperçu de ce que vous allez faire. Nous avons longuement commenté ce code afin que vous puissiez ensuite voir comment cela a été fait en utilisant du code de travail.

REMARQUE: il s'agit d'une solution Swift 2.1 (iOS8 +, XCode 7.2) .

La semaine dernière, j'ai décidé d'écrire le code iOS pour générer une vidéo à partir d'images. J'ai eu un peu d'expérience AVFoundation, mais je n'avais même jamais entendu parler d'un CVPixelBuffer. Je suis tombé sur les réponses sur cette page et aussi ici . Il a fallu plusieurs jours pour tout disséquer et tout remettre en place dans Swift d'une manière qui avait du sens pour mon cerveau. Voici ce que j'ai proposé.

REMARQUE: si vous copiez / collez tout le code ci-dessous dans un seul fichier Swift, il doit être compilé. Vous aurez juste besoin d'ajuster loadImages()et de modifier les RenderSettingsvaleurs.

Partie 1: Préparer les choses

Ici, je regroupe tous les paramètres liés à l'exportation dans une seule RenderSettingsstructure.

import AVFoundation
import UIKit
import Photos

struct 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")
    }
}

Partie 2: L'ImageAnimator

La ImageAnimatorclasse connaît vos images et utilise la VideoWriterclasse pour effectuer le rendu. L'idée est de séparer le code du contenu vidéo du code AVFoundation de bas niveau. J'ai également ajouté saveToLibrary()ici une fonction de classe qui est appelée à la fin de la chaîne pour enregistrer la vidéo dans la photothèque.

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
    }

}

Partie 3: Le VideoWriter

La VideoWriterclasse fait tout le travail lourd d'AVFoundation. C'est surtout une enveloppe autour AVAssetWriteret AVAssetWriterInput. Il contient également un code sophistiqué écrit par pas moi qui sait comment traduire une image en un fichier CVPixelBuffer.

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)
    }

}

Partie 4: y arriver

Une fois que tout est en place, voici vos 3 lignes magiques:

let settings = RenderSettings()
let imageAnimator = ImageAnimator(renderSettings: settings)
imageAnimator.render() {
    print("yes")
}

J'ai pris les idées principales de Zoul et incorporé la méthode AVAssetWriterInputPixelBufferAdaptor et j'en ai fait les débuts d'un petit framework.

N'hésitez pas à le vérifier et à l'améliorer! CEMovieMaker

Voici une version Swift 2.x testée sur iOS 8. Elle combine les réponses de @Scott Raposa et @Praxiteles avec le code de @acj contribué pour une autre question. Le code de @acj est ici: https://gist.github.com/acj/6ae90aa1ebb8cad6b47b . @TimBull a également fourni du code.

Comme @Scott Raposa, je n'avais même jamais entendu parler de CVPixelBufferPoolCreatePixelBufferplusieurs autres fonctions, et encore moins compris comment les utiliser.

Ce que vous voyez ci-dessous a été bricolé principalement par essais et erreurs et en lisant des documents Apple. Veuillez utiliser avec prudence et fournir des suggestions s'il y a des erreurs.

Usage:

import UIKit
import AVFoundation
import Photos

writeImagesAsMovie(yourImages, videoPath: yourPath, videoSize: yourSize, videoFPS: 30)

Code:

func writeImagesAsMovie(allImages: [UIImage], videoPath: String, videoSize: CGSize, videoFPS: Int32) {
    // Create AVAssetWriter to write video
    guard let assetWriter = createAssetWriter(videoPath, size: videoSize) else {
        print("Error converting images to video: AVAssetWriter not created")
        return
    }

    // If here, AVAssetWriter exists so create AVAssetWriterInputPixelBufferAdaptor
    let writerInput = assetWriter.inputs.filter{ $0.mediaType == AVMediaTypeVideo }.first!
    let sourceBufferAttributes : [String : AnyObject] = [
        kCVPixelBufferPixelFormatTypeKey as String : Int(kCVPixelFormatType_32ARGB),
        kCVPixelBufferWidthKey as String : videoSize.width,
        kCVPixelBufferHeightKey as String : videoSize.height,
        ]
    let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: writerInput, sourcePixelBufferAttributes: sourceBufferAttributes)

    // Start writing session
    assetWriter.startWriting()
    assetWriter.startSessionAtSourceTime(kCMTimeZero)
    if (pixelBufferAdaptor.pixelBufferPool == nil) {
        print("Error converting images to video: pixelBufferPool nil after starting session")
        return
    }

    // -- Create queue for <requestMediaDataWhenReadyOnQueue>
    let mediaQueue = dispatch_queue_create("mediaInputQueue", nil)

    // -- Set video parameters
    let frameDuration = CMTimeMake(1, videoFPS)
    var frameCount = 0

    // -- Add images to video
    let numImages = allImages.count
    writerInput.requestMediaDataWhenReadyOnQueue(mediaQueue, usingBlock: { () -> Void in
        // Append unadded images to video but only while input ready
        while (writerInput.readyForMoreMediaData && frameCount < numImages) {
            let lastFrameTime = CMTimeMake(Int64(frameCount), videoFPS)
            let presentationTime = frameCount == 0 ? lastFrameTime : CMTimeAdd(lastFrameTime, frameDuration)

            if !self.appendPixelBufferForImageAtURL(allImages[frameCount], pixelBufferAdaptor: pixelBufferAdaptor, presentationTime: presentationTime) {
                print("Error converting images to video: AVAssetWriterInputPixelBufferAdapter failed to append pixel buffer")
                return
            }

            frameCount += 1
        }

        // No more images to add? End video.
        if (frameCount >= numImages) {
            writerInput.markAsFinished()
            assetWriter.finishWritingWithCompletionHandler {
                if (assetWriter.error != nil) {
                    print("Error converting images to video: \(assetWriter.error)")
                } else {
                    self.saveVideoToLibrary(NSURL(fileURLWithPath: videoPath))
                    print("Converted images to movie @ \(videoPath)")
                }
            }
        }
    })
}


func createAssetWriter(path: String, size: CGSize) -> AVAssetWriter? {
    // Convert <path> to NSURL object
    let pathURL = NSURL(fileURLWithPath: path)

    // Return new asset writer or nil
    do {
        // Create asset writer
        let newWriter = try AVAssetWriter(URL: pathURL, fileType: AVFileTypeMPEG4)

        // Define settings for video input
        let videoSettings: [String : AnyObject] = [
            AVVideoCodecKey  : AVVideoCodecH264,
            AVVideoWidthKey  : size.width,
            AVVideoHeightKey : size.height,
            ]

        // Add video input to writer
        let assetWriterVideoInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: videoSettings)
        newWriter.addInput(assetWriterVideoInput)

        // Return writer
        print("Created asset writer for \(size.width)x\(size.height) video")
        return newWriter
    } catch {
        print("Error creating asset writer: \(error)")
        return nil
    }
}


func appendPixelBufferForImageAtURL(image: UIImage, pixelBufferAdaptor: AVAssetWriterInputPixelBufferAdaptor, presentationTime: CMTime) -> Bool {
    var appendSucceeded = false

    autoreleasepool {
        if  let pixelBufferPool = pixelBufferAdaptor.pixelBufferPool {
            let pixelBufferPointer = UnsafeMutablePointer<CVPixelBuffer?>.alloc(1)
            let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(
                kCFAllocatorDefault,
                pixelBufferPool,
                pixelBufferPointer
            )

            if let pixelBuffer = pixelBufferPointer.memory where status == 0 {
                fillPixelBufferFromImage(image, pixelBuffer: pixelBuffer)
                appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: presentationTime)
                pixelBufferPointer.destroy()
            } else {
                NSLog("Error: Failed to allocate pixel buffer from pool")
            }

            pixelBufferPointer.dealloc(1)
        }
    }

    return appendSucceeded
}


func fillPixelBufferFromImage(image: UIImage, pixelBuffer: CVPixelBufferRef) {
    CVPixelBufferLockBaseAddress(pixelBuffer, 0)

    let pixelData = CVPixelBufferGetBaseAddress(pixelBuffer)
    let rgbColorSpace = CGColorSpaceCreateDeviceRGB()

    // Create CGBitmapContext
    let context = CGBitmapContextCreate(
        pixelData,
        Int(image.size.width),
        Int(image.size.height),
        8,
        CVPixelBufferGetBytesPerRow(pixelBuffer),
        rgbColorSpace,
        CGImageAlphaInfo.PremultipliedFirst.rawValue
    )

    // Draw image into context
    CGContextDrawImage(context, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage)

    CVPixelBufferUnlockBaseAddress(pixelBuffer, 0)
}


func saveVideoToLibrary(videoURL: NSURL) {
    PHPhotoLibrary.requestAuthorization { status in
        // Return if unauthorized
        guard status == .Authorized else {
            print("Error saving video: unauthorized access")
            return
        }

        // If here, save video to library
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
        }) { success, error in
            if !success {
                print("Error saving video: \(error)")
            }
        }
    }
}

Voici la version swift3 comment convertir un tableau d'images en vidéo

import Foundation
import AVFoundation
import UIKit

typealias CXEMovieMakerCompletion = (URL) -> Void
typealias CXEMovieMakerUIImageExtractor = (AnyObject) -> UIImage?


public class ImagesToVideoUtils: NSObject {

    static let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
    static let tempPath = paths[0] + "/exprotvideo.mp4"
    static let fileURL = URL(fileURLWithPath: tempPath)
//    static let tempPath = NSTemporaryDirectory() + "/exprotvideo.mp4"
//    static let fileURL = URL(fileURLWithPath: tempPath)


    var assetWriter:AVAssetWriter!
    var writeInput:AVAssetWriterInput!
    var bufferAdapter:AVAssetWriterInputPixelBufferAdaptor!
    var videoSettings:[String : Any]!
    var frameTime:CMTime!
    //var fileURL:URL!

    var completionBlock: CXEMovieMakerCompletion?
    var movieMakerUIImageExtractor:CXEMovieMakerUIImageExtractor?


    public class func videoSettings(codec:String, width:Int, height:Int) -> [String: Any]{
        if(Int(width) % 16 != 0){
            print("warning: video settings width must be divisible by 16")
        }

        let videoSettings:[String: Any] = [AVVideoCodecKey: AVVideoCodecJPEG, //AVVideoCodecH264,
                                           AVVideoWidthKey: width,
                                           AVVideoHeightKey: height]

        return videoSettings
    }

    public init(videoSettings: [String: Any]) {
        super.init()


        if(FileManager.default.fileExists(atPath: ImagesToVideoUtils.tempPath)){
            guard (try? FileManager.default.removeItem(atPath: ImagesToVideoUtils.tempPath)) != nil else {
                print("remove path failed")
                return
            }
        }


        self.assetWriter = try! AVAssetWriter(url: ImagesToVideoUtils.fileURL, fileType: AVFileTypeQuickTimeMovie)

        self.videoSettings = videoSettings
        self.writeInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: videoSettings)
        assert(self.assetWriter.canAdd(self.writeInput), "add failed")

        self.assetWriter.add(self.writeInput)
        let bufferAttributes:[String: Any] = [kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32ARGB)]
        self.bufferAdapter = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: self.writeInput, sourcePixelBufferAttributes: bufferAttributes)
        self.frameTime = CMTimeMake(1, 5)
    }

    func createMovieFrom(urls: [URL], withCompletion: @escaping CXEMovieMakerCompletion){
        self.createMovieFromSource(images: urls as [AnyObject], extractor:{(inputObject:AnyObject) ->UIImage? in
            return UIImage(data: try! Data(contentsOf: inputObject as! URL))}, withCompletion: withCompletion)
    }

    func createMovieFrom(images: [UIImage], withCompletion: @escaping CXEMovieMakerCompletion){
        self.createMovieFromSource(images: images, extractor: {(inputObject:AnyObject) -> UIImage? in
            return inputObject as? UIImage}, withCompletion: withCompletion)
    }

    func createMovieFromSource(images: [AnyObject], extractor: @escaping CXEMovieMakerUIImageExtractor, withCompletion: @escaping CXEMovieMakerCompletion){
        self.completionBlock = withCompletion

        self.assetWriter.startWriting()
        self.assetWriter.startSession(atSourceTime: kCMTimeZero)

        let mediaInputQueue = DispatchQueue(label: "mediaInputQueue")
        var i = 0
        let frameNumber = images.count

        self.writeInput.requestMediaDataWhenReady(on: mediaInputQueue){
            while(true){
                if(i >= frameNumber){
                    break
                }

                if (self.writeInput.isReadyForMoreMediaData){
                    var sampleBuffer:CVPixelBuffer?
                    autoreleasepool{
                        let img = extractor(images[i])
                        if img == nil{
                            i += 1
                            print("Warning: counld not extract one of the frames")
                            //continue
                        }
                        sampleBuffer = self.newPixelBufferFrom(cgImage: img!.cgImage!)
                    }
                    if (sampleBuffer != nil){
                        if(i == 0){
                            self.bufferAdapter.append(sampleBuffer!, withPresentationTime: kCMTimeZero)
                        }else{
                            let value = i - 1
                            let lastTime = CMTimeMake(Int64(value), self.frameTime.timescale)
                            let presentTime = CMTimeAdd(lastTime, self.frameTime)
                            self.bufferAdapter.append(sampleBuffer!, withPresentationTime: presentTime)
                        }
                        i = i + 1
                    }
                }
            }
            self.writeInput.markAsFinished()
            self.assetWriter.finishWriting {
                DispatchQueue.main.sync {
                    self.completionBlock!(ImagesToVideoUtils.fileURL)
                }
            }
        }
    }

    func newPixelBufferFrom(cgImage:CGImage) -> CVPixelBuffer?{
        let options:[String: Any] = [kCVPixelBufferCGImageCompatibilityKey as String: true, kCVPixelBufferCGBitmapContextCompatibilityKey as String: true]
        var pxbuffer:CVPixelBuffer?
        let frameWidth = self.videoSettings[AVVideoWidthKey] as! Int
        let frameHeight = self.videoSettings[AVVideoHeightKey] as! Int

        let status = CVPixelBufferCreate(kCFAllocatorDefault, frameWidth, frameHeight, kCVPixelFormatType_32ARGB, options as CFDictionary?, &pxbuffer)
        assert(status == kCVReturnSuccess && pxbuffer != nil, "newPixelBuffer failed")

        CVPixelBufferLockBaseAddress(pxbuffer!, CVPixelBufferLockFlags(rawValue: 0))
        let pxdata = CVPixelBufferGetBaseAddress(pxbuffer!)
        let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
        let context = CGContext(data: pxdata, width: frameWidth, height: frameHeight, bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pxbuffer!), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.noneSkipFirst.rawValue)
        assert(context != nil, "context is nil")

        context!.concatenate(CGAffineTransform.identity)
        context!.draw(cgImage, in: CGRect(x: 0, y: 0, width: cgImage.width, height: cgImage.height))
        CVPixelBufferUnlockBaseAddress(pxbuffer!, CVPixelBufferLockFlags(rawValue: 0))
        return pxbuffer
    }
}

Je l'utilise avec la capture d'écran, pour créer essentiellement une vidéo de capture d'écran, voici l'histoire complète / l'exemple complet .

Je viens de traduire la réponse @Scott Raposa en swift3 (avec quelques très petits changements):

import AVFoundation
import UIKit
import Photos

struct RenderSettings {

    var size : CGSize = .zero
    var fps: Int32 = 6   // frames per second
    var avCodecKey = AVVideoCodecH264
    var videoFilename = "render"
    var videoFilenameExt = "mp4"


    var outputURL: URL {
        // 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 = FileManager.default
        if let tmpDirURL = try? fileManager.url(for: .cachesDirectory, in: .userDomainMask, appropriateFor: nil, create: true) {
            return tmpDirURL.appendingPathComponent(videoFilename).appendingPathExtension(videoFilenameExt)
        }
        fatalError("URLForDirectory() failed")
    }
}


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: URL) {
        PHPhotoLibrary.requestAuthorization { status in
            guard status == .authorized else { return }

            PHPhotoLibrary.shared().performChanges({
                PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: videoURL)
            }) { success, error in
                if !success {
                    print("Could not save video to photo library:", error)
                }
            }
        }
    }

    class func removeFileAtURL(fileURL: URL) {
        do {
            try FileManager.default.removeItem(atPath: 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(fileURL: settings.outputURL)

        videoWriter.start()
        videoWriter.render(appendPixelBuffers: appendPixelBuffers) {
            ImageAnimator.saveToLibrary(videoURL: 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: image, withPresentationTime: presentationTime)
            if success == false {
                fatalError("addImage() failed")
            }

            frameNum += 1
        }

        // Inform writer all buffers have been written.
        return true
    }

}


class VideoWriter {

    let renderSettings: RenderSettings

    var videoWriter: AVAssetWriter!
    var videoWriterInput: AVAssetWriterInput!
    var pixelBufferAdaptor: AVAssetWriterInputPixelBufferAdaptor!

    var isReadyForData: Bool {
        return videoWriterInput?.isReadyForMoreMediaData ?? 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, CVPixelBufferLockFlags(rawValue: 0))

        let data = CVPixelBufferGetBaseAddress(pixelBuffer)
        let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
        let context = CGContext(data: data, width: Int(size.width), height: Int(size.height),
                                bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pixelBuffer), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue)

        context!.clear(CGRect(x:0,y: 0,width: size.width,height: 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

        context?.draw(image.cgImage!, in: CGRect(x:x,y: y, width: newSize.width, height: newSize.height))
        CVPixelBufferUnlockBaseAddress(pixelBuffer, CVPixelBufferLockFlags(rawValue: 0))

        return pixelBuffer
    }

    init(renderSettings: RenderSettings) {
        self.renderSettings = renderSettings
    }

    func start() {

        let avOutputSettings: [String: Any] = [
            AVVideoCodecKey: renderSettings.avCodecKey,
            AVVideoWidthKey: NSNumber(value: Float(renderSettings.size.width)),
            AVVideoHeightKey: NSNumber(value: Float(renderSettings.size.height))
        ]

        func createPixelBufferAdaptor() {
            let sourcePixelBufferAttributesDictionary = [
                kCVPixelBufferPixelFormatTypeKey as String: NSNumber(value: kCVPixelFormatType_32ARGB),
                kCVPixelBufferWidthKey as String: NSNumber(value: Float(renderSettings.size.width)),
                kCVPixelBufferHeightKey as String: NSNumber(value: Float(renderSettings.size.height))
            ]
            pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput,
                                                                      sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
        }

        func createAssetWriter(outputURL: URL) -> AVAssetWriter {
            guard let assetWriter = try? AVAssetWriter(outputURL: outputURL, fileType: AVFileTypeMPEG4) else {
                fatalError("AVAssetWriter() failed")
            }

            guard assetWriter.canApply(outputSettings: avOutputSettings, forMediaType: AVMediaTypeVideo) else {
                fatalError("canApplyOutputSettings() failed")
            }

            return assetWriter
        }

        videoWriter = createAssetWriter(outputURL: renderSettings.outputURL)
        videoWriterInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: avOutputSettings)

        if videoWriter.canAdd(videoWriterInput) {
            videoWriter.add(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.startSession(atSourceTime: 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 = DispatchQueue(label: "mediaInputQueue")
        videoWriterInput.requestMediaDataWhenReady(on: queue) {
            let isFinished = appendPixelBuffers?(self) ?? false
            if isFinished {
                self.videoWriterInput.markAsFinished()
                self.videoWriter.finishWriting() {
                    DispatchQueue.main.async {
                        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: image, pixelBufferPool: pixelBufferAdaptor.pixelBufferPool!, size: renderSettings.size)
        return pixelBufferAdaptor.append(pixelBuffer, withPresentationTime: presentationTime)
    }

}

Eh bien, c'est un peu difficile à implémenter en Objective-C pur ... Si vous développez pour des appareils jailbreakés, une bonne idée est d'utiliser l'outil de ligne de commande ffmpeg depuis votre application. il est assez facile de créer un film à partir d'images avec une commande comme:

ffmpeg -r 10 -b 1800 -i %03d.jpg test1800.mp4

Notez que les images doivent être nommées séquentiellement et également placées dans le même répertoire. Pour plus d'informations, consultez: http://electron.mit.edu/~gsteele/ffmpeg/

Utilisez AVAssetWriter pour écrire des images sous forme de film. J'ai déjà répondu ici: - https://stackoverflow.com/a/19166876/1582217