如何将*单个图像*与视频合并
How to merge a *Single Image* with a video
我正在尝试将单个视频与单个图像结合起来。 这不是试图将许多图像组合成一个视频，例如
How do I export UIImage array as a movie?
Make movie file with picture Array and song file, using AVAsset
我正在使用 AVMutableComposition 合并曲目。我的应用程序能够组合视频和图像（但就目前而言，视频组合很好！）我尝试使用 AVAssetWriter 将单个图像转换为视频（我相信这是我的问题所在，但不是 100% 肯定）。然后我将其保存到应用程序 (documents directory)。从那里，我在我的合并中访问它，并将视频和现在变成视频的图像组合起来。
流量：
用户选择图像 ->
图像到 AVAssetWriter 以更改为视频 ->
将我已经预设的视频与视频合并->
结果：使用所选图像和预设视频制作 1 个视频。
我所拥有的问题：我的代码提供了一个空白 space，视频中的图像应该在该位置。比如，我拥有的 ImageConverter 文件会将其转换为视频，但我只会看到最后一帧作为图像，而其他每一帧都是透明的，就好像图片不存在一样。因此，如果我将图像转换为视频 5 秒（假设为 30 frames/sec），那么我将看到空白 space (30*5)-1 帧，然后是最后一帧，图片终于会出现。我只是在寻找有关如何将单个图像制作成视频的指导 或 将视频和图像组合在一起而不将图像转换为视频。谢谢！
在此处合并文件
func merge() {
if let firstAsset = controller.firstAsset, secondAsset = self.asset {
// 1 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
let mixComposition = AVMutableComposition()
let firstTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo,
preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
do {
try firstTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, CMTime(seconds: 8, preferredTimescale: 600)),
ofTrack: firstAsset.tracksWithMediaType(AVMediaTypeVideo)[0] ,
atTime: kCMTimeZero)
} catch _ {
print("Failed to load first track")
}
do {
//HERE THE TIME IS 0.666667, BUT SHOULD BE 0
print(CMTimeGetSeconds(secondAsset.duration), CMTimeGetSeconds(firstTrack.timeRange.duration))
try firstTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, secondAsset.duration),
ofTrack: secondAsset.tracksWithMediaType(AVMediaTypeVideo)[0],
atTime: firstTrack.timeRange.duration)
} catch _ {
print("Failed to load second track")
}
do {
try firstTrack.insertTimeRange(CMTimeRangeMake(CMTime(seconds: 8+CMTimeGetSeconds(secondAsset.duration), preferredTimescale: 600), firstAsset.duration),
ofTrack: firstAsset.tracksWithMediaType(AVMediaTypeVideo)[0] ,
atTime: firstTrack.timeRange.duration+secondTrack.timeRange.duration)
} catch _ {
print("failed")
}
// 3 - Audio track
if let loadedAudioAsset = controller.audioAsset {
let audioTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: 0)
do {
try audioTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, firstAsset.duration),
ofTrack: loadedAudioAsset.tracksWithMediaType(AVMediaTypeAudio)[0] ,
atTime: kCMTimeZero)
} catch _ {
print("Failed to load Audio track")
}
}
// 4 - Get path
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .LongStyle
dateFormatter.timeStyle = .ShortStyle
let date = dateFormatter.stringFromDate(NSDate())
let savePath = (documentDirectory as NSString).stringByAppendingPathComponent("mergeVideo.mov")
let url = NSURL(fileURLWithPath: savePath)
_ = try? NSFileManager().removeItemAtURL(url)
// 5 - Create Exporter
print("exporting")
guard let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality) else { return }
exporter.outputURL = url
exporter.outputFileType = AVFileTypeQuickTimeMovie
exporter.shouldOptimizeForNetworkUse = false
exporter.videoComposition = mainComposition
// 6 - Perform the Export
controller.currentlyEditing = true
exporter.exportAsynchronouslyWithCompletionHandler() {
dispatch_async(dispatch_get_main_queue()) { _ in
print("done")
self.controller.currentlyEditing = false
self.controller.merged = true
self.button.blurView.superview?.hidden = true
self.controller.player.replaceCurrentItemWithPlayerItem(AVPlayerItem(URL: url))
self.controller.firstAsset = AVAsset(URL: url)
}
}
}
}
func exportDidFinish(session: AVAssetExportSession) {
if session.status == AVAssetExportSessionStatus.Failed {
print(session.error)
}
if session.status == AVAssetExportSessionStatus.Completed {
print("succed")
}
}
在此处转换图像
class MyConverter: NSObject {
var image:UIImage!
convenience init(image:UIImage) {
self.init()
self.image = image
}
var outputURL: NSURL {
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let savePath = (documentDirectory as NSString).stringByAppendingPathComponent("mergeVideo-pic.mov")
return getURL(savePath)
}
func getURL(path:String) -> NSURL {
let movieDestinationUrl = NSURL(fileURLWithPath: path)
_ = try? NSFileManager().removeItemAtURL(movieDestinationUrl)
let url = NSURL(fileURLWithPath: path)
return url
}
func build(completion:() -> Void) {
guard let videoWriter = try? AVAssetWriter(URL: outputURL, fileType: AVFileTypeQuickTimeMovie) else {
fatalError("AVAssetWriter error")
}
let outputSettings = [AVVideoCodecKey : AVVideoCodecH264, AVVideoWidthKey : NSNumber(float: Float(image.size.width)), AVVideoHeightKey : NSNumber(float: Float(image.size.height))]
guard videoWriter.canApplyOutputSettings(outputSettings, forMediaType: AVMediaTypeVideo) else {
fatalError("Negative : Can't apply the Output settings...")
}
let videoWriterInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: outputSettings)
let sourcePixelBufferAttributesDictionary = [kCVPixelBufferPixelFormatTypeKey as String : NSNumber(unsignedInt: kCVPixelFormatType_32ARGB), kCVPixelBufferWidthKey as String: NSNumber(float: Float(image.size.width)), kCVPixelBufferHeightKey as String: NSNumber(float: Float(image.size.height))]
let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
if videoWriter.canAddInput(videoWriterInput) {
videoWriter.addInput(videoWriterInput)
}
if videoWriter.startWriting() {
videoWriter.startSessionAtSourceTime(kCMTimeZero)
assert(pixelBufferAdaptor.pixelBufferPool != nil)
}
let media_queue = dispatch_queue_create("mediaInputQueue", nil)
videoWriterInput.requestMediaDataWhenReadyOnQueue(media_queue, usingBlock: { () -> Void in
var appendSucceeded = true
//Time HERE IS ZERO, but in Merge file, it is 0.66667
let presentationTime = CMTimeMake(0, 600)
var pixelBuffer: CVPixelBuffer? = nil
let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferAdaptor.pixelBufferPool!, &pixelBuffer)
if let pixelBuffer = pixelBuffer where status == 0 {
let managedPixelBuffer = pixelBuffer
CVPixelBufferLockBaseAddress(managedPixelBuffer, 0)
let data = CVPixelBufferGetBaseAddress(managedPixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGBitmapContextCreate(data, Int(self.image.size.width), Int(self.image.size.height), 8, CVPixelBufferGetBytesPerRow(managedPixelBuffer), rgbColorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue)
CGContextClearRect(context, CGRectMake(0, 0, CGFloat(self.image.size.width), CGFloat(self.image.size.height)))
CGContextDrawImage(context, CGRectMake(0, 0, self.image.size.width, self.image.size.height), self.image.CGImage)
CVPixelBufferUnlockBaseAddress(managedPixelBuffer, 0)
appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: presentationTime)
} else {
print("Failed to allocate pixel buffer")
appendSucceeded = false
}
if !appendSucceeded {
print("append failed")
}
videoWriterInput.markAsFinished()
videoWriter.finishWritingWithCompletionHandler { () -> Void in
print("FINISHED!!!!!")
completion()
}
})
}
}
注意： 我发现如果我在 ImageConverter 内部执行 print(presentationTime) 它会打印 0，然后在合并内打印持续时间的时间，我得到 0.666667
注意： 还没有答案，但我会不断地把这个问题设为悬赏，直到我找到答案或有人帮助我！谢谢！
对，所以我前阵子确实处理过这个问题。问题确实在于您如何从图片创建视频。您需要做的是在时间为零时添加像素缓冲区，然后在最后添加 AGAIN，否则您将在最后一帧之前得到一个空视频，就像您正在经历的那样。
以下代码将是我更新您的代码的最佳尝试。最后，我将 post 我的解决方案 Objective-C 以防它对其他人有帮助。
func build(completion:() -> Void) {
guard let videoWriter = try? AVAssetWriter(URL: outputURL, fileType: AVFileTypeQuickTimeMovie) else {
fatalError("AVAssetWriter error")
}
// This might not be a problem for you but width HAS to be divisible by 16 or the movie will come out distorted... don't ask me why. So this is a safeguard
let pixelsToRemove: Double = fmod(image.size.width, 16)
let pixelsToAdd: Double = 16 - pixelsToRemove
let size: CGSize = CGSizeMake(image.size.width + pixelsToAdd, image.size.height)
let outputSettings = [AVVideoCodecKey : AVVideoCodecH264, AVVideoWidthKey : NSNumber(float: Float(size.width)), AVVideoHeightKey : NSNumber(float: Float(size.height))]
guard videoWriter.canApplyOutputSettings(outputSettings, forMediaType: AVMediaTypeVideo) else {
fatalError("Negative : Can't apply the Output settings...")
}
let videoWriterInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: outputSettings)
let sourcePixelBufferAttributesDictionary = [kCVPixelBufferPixelFormatTypeKey as String : NSNumber(unsignedInt: kCVPixelFormatType_32ARGB), kCVPixelBufferWidthKey as String: NSNumber(float: Float(size.width)), kCVPixelBufferHeightKey as String: NSNumber(float: Float(size.height))]
let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
if videoWriter.canAddInput(videoWriterInput) {
videoWriter.addInput(videoWriterInput)
}
if videoWriter.startWriting() {
videoWriter.startSessionAtSourceTime(kCMTimeZero)
assert(pixelBufferAdaptor.pixelBufferPool != nil)
}
// For simplicity, I'm going to remove the media queue you created and instead explicitly wait until I can append since i am only writing one pixel buffer at two different times
var pixelBufferCreated = true
var pixelBuffer: CVPixelBuffer? = nil
let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferAdaptor.pixelBufferPool!, &pixelBuffer)
if let pixelBuffer = pixelBuffer where status == 0 {
let managedPixelBuffer = pixelBuffer
CVPixelBufferLockBaseAddress(managedPixelBuffer, 0)
let data = CVPixelBufferGetBaseAddress(managedPixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGBitmapContextCreate(data, Int(size.width), Int(size.height), 8, CVPixelBufferGetBytesPerRow(managedPixelBuffer), rgbColorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue)
CGContextClearRect(context, CGRectMake(0, 0, CGFloat(size.width), CGFloat(size.height)))
CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), self.image.CGImage)
CVPixelBufferUnlockBaseAddress(managedPixelBuffer, 0)
} else {
print("Failed to allocate pixel buffer")
pixelBufferCreated = false
}
if (pixelBufferCreated) {
// Here is where the magic happens, we have our pixelBuffer it's time to start writing
// FIRST - add at time zero
var appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: kCMTimeZero];
if (!appendSucceeded) {
// something went wrong, up to you to handle. Should probably return so the rest of the code is not executed though
}
// SECOND - wait until the writer is ready for more data with an empty while
while !writerInput.readyForMoreMediaData {}
// THIRD - make a CMTime with the desired length of your picture-video. I am going to arbitrarily make it 5 seconds here
let frameTime: CMTime = CMTimeMake(5, 1) // 5 seconds
// FOURTH - add the same exact pixel to the end of the video you are creating
appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: frameTime];
if (!appendSucceeded) {
// something went wrong, up to you to handle. Should probably return so the rest of the code is not executed though
}
videoWriterInput.markAsFinished() {
videoWriter.endSessionAtSourceTime(frameTime)
}
videoWriter.finishWritingWithCompletionHandler { () -> Void in
if videoWriter.status != .Completed {
// Error writing the video... handle appropriately
} else {
print("FINISHED!!!!!")
completion()
}
}
}
}
我是如何在 Obj-C 中做到这一点的
注意：我必须进行一些编辑才能使其独立，因此此方法将 return 一个字符串，其中包含视频 将 写入的路径。它是在视频写入完成之前 return 编辑的，因此如果您不小心 可能 可以在它准备好之前访问它
-(NSString *)makeMovieFromImageData:(NSData *)imageData {
NSError *error;
UIImage *image = [UIImage imageWithData:imageData];
// width has to be divisible by 16 or the movie comes out distorted... don't ask me why
double pixelsToRemove = fmod(image.size.width, 16);
double pixelsToAdd = 16 - pixelsToRemove;
CGSize size = CGSizeMake(image.size.width+pixelsToAdd, image.size.height);
BOOL hasFoundValidPath = NO;
NSURL *tempFileURL;
NSString *outputFile;
while (!hasFoundValidPath) {
NSString *guid = [[NSUUID new] UUIDString];
outputFile = [NSString stringWithFormat:@"picture_%@.mp4", guid];
NSString *outputDirectory = [NSSearchPathForDirectoriesInDomains(NSTemporaryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *tempPath = [outputDirectory stringByAppendingPathComponent:outputFile];
// Will fail if destination already has a file
if ([[NSFileManager defaultManager] fileExistsAtPath:tempPath]) {
continue;
} else {
hasFoundValidPath = YES;
}
tempFileURL = [NSURL fileURLWithPath:tempPath];
}
// Start writing
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:tempFileURL
fileType:AVFileTypeQuickTimeMovie
error:&error];
if (error) {
// handle error
}
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:size.width], AVVideoWidthKey,
[NSNumber numberWithInt:size.height], AVVideoHeightKey,
nil];
AVAssetWriterInput* writerInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings];
NSDictionary *bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil];
AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
sourcePixelBufferAttributes:bufferAttributes];
if ([videoWriter canAddInput:writerInput]) {
[videoWriter addInput:writerInput];
} else {
// handle error
}
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CGImageRef img = [image CGImage];
// Now I am going to create the bixelBuffer
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef buffer = NULL;
CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, size.width,
size.height, kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options,
&pxbuffer);
if ( !(status == kCVReturnSuccess && pxbuffer != NULL) ) {
NSLog(@"There be some issue. We didn't get a buffer from the image");
}
CVPixelBufferLockBaseAddress(buffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(buffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
size.height, 8, 4*size.width, rgbColorSpace,
(CGBitmapInfo)kCGImageAlphaPremultipliedFirst);
CGContextSetRGBFillColor(context, 0, 0, 0, 0);
CGContextConcatCTM(context, CGAffineTransformIdentity);
CGContextDrawImage(context, CGRectMake(0, 0, size.width,
size.height), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(buffer, 0);
// At this point we have our buffer so we are going to start by adding to time zero
[adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];
while (!writerInput.readyForMoreMediaData) {} // wait until ready
CMTime frameTime = CMTimeMake(5, 1); // 5 second frame
[adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
CFRelease(buffer);
[writerInput markAsFinished];
[videoWriter endSessionAtSourceTime:frameTime];
[videoWriter finishWritingWithCompletionHandler:^{
if (videoWriter.status != AVAssetWriterStatusCompleted) {
// Error
}
}]; // end videoWriter finishWriting Block
// NOTE: the URL is actually being returned before the videoWriter finishes writing so be careful to not access it until it's ready
return outputFile;
}
这是对我有用的我希望这对你有用:-
-(void)MixVideo:(NSString *)vidioUrlString withImage:(UIImage *)img
{
NSURL *videoUrl1 = [[NSURL alloc] initFileURLWithPath:vidioUrlString];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl1 options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];
CGSize sizeOfVideo = CGSizeMake(320, 568);
//Image of watermark
UIImage *myImage=img;
CALayer *layerCa = [CALayer layer];
layerCa.contents = (id)myImage.CGImage;
layerCa.frame = CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
layerCa.opacity = 1.0;
CALayer *parentLayer=[CALayer layer];
CALayer *videoLayer=[CALayer layer];
parentLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
videoLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:layerCa];
AVMutableVideoComposition *videoComposition=[AVMutableVideoComposition videoComposition] ;
videoComposition.frameDuration=CMTimeMake(1, 30);
videoComposition.renderSize=sizeOfVideo;
videoComposition.animationTool=[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComposition.instructions = [NSArray arrayWithObject: instruction];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
finalPath = [documentsDirectory stringByAppendingFormat:@"/myVideo.mp4"];
if ([[NSFileManager defaultManager] fileExistsAtPath:finalPath])
{
[[NSFileManager defaultManager] removeItemAtPath:finalPath error:nil];
}
SDAVAssetExportSession *encoder = [SDAVAssetExportSession.alloc initWithAsset:mixComposition];
encoder.outputFileType = AVFileTypeMPEG4;
encoder.outputURL = [NSURL fileURLWithPath:finalPath];
encoder.videoComposition=videoComposition;
encoder.videoSettings = @
{
AVVideoCodecKey: AVVideoCodecH264,
AVVideoWidthKey: @320,
AVVideoHeightKey: @568,
AVVideoCompressionPropertiesKey: @
{
AVVideoAverageBitRateKey: @900000,
AVVideoProfileLevelKey: AVVideoProfileLevelH264MainAutoLevel,
},
};
encoder.audioSettings = @
{
AVFormatIDKey: @(kAudioFormatMPEG4AAC),
AVNumberOfChannelsKey: @2,
AVSampleRateKey: @44100,
AVEncoderBitRateKey: @128000,
};
[encoder exportAsynchronouslyWithCompletionHandler:^
{
if (encoder.status == AVAssetExportSessionStatusCompleted)
{
NSLog(@"Video export succeeded");
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(finalPath))
{
NSLog(@"Video exported successfully path = %@ ",finalPath);
}
}
else if (encoder.status == AVAssetExportSessionStatusCancelled)
{
NSLog(@"Video export cancelled");
}
else
{
NSLog(@"Video export failed with error: %@ (%ld)", encoder.error.localizedDescription, (long)encoder.error.code);
}
}];
}
这对我有用，将单个图像导出到视频（视频是可移动的而不是静态的）。 Swift3.
//
// CXEImageToAssetURL.swift
// CXEngine
//
// Created by wulei on 16/12/14.
// Copyright © 2016年 wulei. All rights reserved.
//
import Foundation
import AVFoundation
import UIKit
import Photos
fileprivate extension UIImage{
func normalizedImage() -> UIImage?{
// if self.imageOrientation == .up{
// return self
// }
let factor = CGFloat(0.8)
UIGraphicsBeginImageContextWithOptions(CGSize(width:self.size.width * factor, height: self.size.height * factor), false, self.scale)
self.draw(in: CGRect(x: 0, y: 0, width: self.size.width * factor, height: self.size.height * factor))
let normalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return normalImage
}
// func clipImage() -> UIImage {
// var x = CGFloat(0)
// var y = CGFloat(0)
// let imageHeight = (self.size.width * 9) / 16
// y = (self.size.height - imageHeight)/2
// var rcTmp = CGRect(origin: CGPoint(x: x, y: y), size: self.size)
// if self.scale > 1.0 {
// rcTmp = CGRect(x: rcTmp.origin.x * self.scale, y: rcTmp.origin.y * self.scale, width: rcTmp.size.width * self.scale, height: rcTmp.size.height * self.scale)
// }
// rcTmp.size.height = imageHeight
// let imageRef = self.cgImage!.cropping(to: rcTmp)
// let result = UIImage(cgImage: imageRef!, scale: self.scale, orientation: self.imageOrientation)
// return result
// return self
// }
}
public typealias CXEImageToVideoProgress = (Float) -> Void
typealias CXEMovieMakerUIImageExtractor = (AnyObject) -> UIImage?
public class CXEImageToVideo: NSObject{
//MARK: Private Properties
private var assetWriter:AVAssetWriter!
private var writeInput:AVAssetWriterInput!
private var bufferAdapter:AVAssetWriterInputPixelBufferAdaptor!
private var videoSettings:[String : Any]!
private var frameTime:CMTime!
private var fileURL:URL!
private var duration:Int = 0
//MARK: Class Method
private func videoSettingsFunc(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: AVVideoCodecH264,
AVVideoWidthKey: width,
AVVideoHeightKey: height]
return videoSettings
}
//MARK: Public methods
public init(fileURL: URL, videoWidth:Int, videoHeight:Int) {
super.init()
self.videoSettings = videoSettingsFunc(width: videoWidth, height: videoHeight)
self.fileURL = fileURL
self.assetWriter = try! AVAssetWriter(url: self.fileURL, fileType: AVFileTypeQuickTimeMovie)
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, 25)
}
// public func createMovieFrom(url: URL, duration:Int, progressExtractor: CXEImageToVideoProgress){
// self.duration = duration
// self.createMovieFromSource(image: url as AnyObject, extractor:{(inputObject:AnyObject) ->UIImage? in
// return UIImage(data: try! Data(contentsOf: inputObject as! URL))}, progressExtractor: progressExtractor)
// }
public func createMovieFrom(imageData: Data, duration:Int, progressExtractor: CXEImageToVideoProgress){
var image = UIImage(data: imageData)
image = image?.normalizedImage()
assert(image != nil)
self.duration = duration
self.createMovieFromSource(image: image!, extractor: {(inputObject:AnyObject) -> UIImage? in
return inputObject as? UIImage}, progressExtractor: progressExtractor)
}
//MARK: Private methods
private func createMovieFromSource(image: AnyObject, extractor: @escaping CXEMovieMakerUIImageExtractor, progressExtractor: CXEImageToVideoProgress){
self.assetWriter.startWriting()
let zeroTime = CMTimeMake(Int64(0),self.frameTime.timescale)
self.assetWriter.startSession(atSourceTime: zeroTime)
while !self.writeInput.isReadyForMoreMediaData {
usleep(100)
}
var sampleBuffer:CVPixelBuffer?
var pxDataBuffer:CVPixelBuffer?
let img = extractor(image)
assert(img != nil)
let options:[String: Any] = [kCVPixelBufferCGImageCompatibilityKey as String: true, kCVPixelBufferCGBitmapContextCompatibilityKey as String: true]
let frameHeight = self.videoSettings[AVVideoHeightKey] as! Int
let frameWidth = self.videoSettings[AVVideoWidthKey] as! Int
let originHeight = frameWidth * img!.cgImage!.height / img!.cgImage!.width
let heightDifference = originHeight - frameHeight
let frameCounts = self.duration * Int(self.frameTime.timescale)
let spacingOfHeight = heightDifference / frameCounts
sampleBuffer = self.newPixelBufferFrom(cgImage: img!.cgImage!)
assert(sampleBuffer != nil)
var presentTime = CMTimeMake(1, self.frameTime.timescale)
var stepRows = 0
for i in 0..<frameCounts {
progressExtractor(Float(i) / Float(frameCounts))
CVPixelBufferLockBaseAddress(sampleBuffer!, CVPixelBufferLockFlags(rawValue: 0))
let pointer = CVPixelBufferGetBaseAddress(sampleBuffer!)
var pxData = pointer?.assumingMemoryBound(to: UInt8.self)
let bytes = CVPixelBufferGetBytesPerRow(sampleBuffer!) * stepRows
pxData = pxData?.advanced(by: bytes)
let status = CVPixelBufferCreateWithBytes(kCFAllocatorDefault, frameWidth, frameHeight, kCVPixelFormatType_32ARGB, pxData!, CVPixelBufferGetBytesPerRow(sampleBuffer!), nil, nil, options as CFDictionary?, &pxDataBuffer)
assert(status == kCVReturnSuccess && pxDataBuffer != nil, "newPixelBuffer failed")
CVPixelBufferUnlockBaseAddress(sampleBuffer!, CVPixelBufferLockFlags(rawValue: 0))
while !self.writeInput.isReadyForMoreMediaData {
usleep(100)
}
if (self.writeInput.isReadyForMoreMediaData){
if i == 0{
self.bufferAdapter.append(pxDataBuffer!, withPresentationTime: zeroTime)
}else{
self.bufferAdapter.append(pxDataBuffer!, withPresentationTime: presentTime)
}
presentTime = CMTimeAdd(presentTime, self.frameTime)
}
stepRows += spacingOfHeight
}
self.writeInput.markAsFinished()
self.assetWriter.finishWriting {}
var isSuccess:Bool = false
while(!isSuccess){
switch self.assetWriter.status {
case .completed:
isSuccess = true
print("completed")
case .writing:
usleep(100)
print("writing")
case .failed:
isSuccess = true
print("failed")
case .cancelled:
isSuccess = true
print("cancelled")
default:
isSuccess = true
print("unknown")
}
}
}
private 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 originHeight = frameWidth * cgImage.height / cgImage.width
let status = CVPixelBufferCreate(kCFAllocatorDefault, frameWidth, originHeight, 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: originHeight, 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: frameWidth, height: originHeight))
CVPixelBufferUnlockBaseAddress(pxbuffer!, CVPixelBufferLockFlags(rawValue: 0))
return pxbuffer
}
}
Swift 3 代码，应该是一个好的开始。如果在生产中使用，仍然需要错误处理和处理某些视频的视频大小/方向。
@discardableResult func merge(
video videoPath: String,
withForegroundImage foregroundImage: UIImage,
completion: @escaping (AVAssetExportSession) -> Void) -> AVAssetExportSession {
let videoUrl = URL(fileURLWithPath: videoPath)
let videoUrlAsset = AVURLAsset(url: videoUrl, options: nil)
// Setup `mutableComposition` from the existing video
let mutableComposition = AVMutableComposition()
let videoAssetTrack = videoUrlAsset.tracks(withMediaType: AVMediaTypeVideo).first!
let videoCompositionTrack = mutableComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
videoCompositionTrack.preferredTransform = videoAssetTrack.preferredTransform
try! videoCompositionTrack.insertTimeRange(CMTimeRange(start:kCMTimeZero, duration:videoAssetTrack.timeRange.duration), of: videoAssetTrack, at: kCMTimeZero)
let audioAssetTrack = videoUrlAsset.tracks(withMediaType: AVMediaTypeAudio).first!
let audioCompositionTrack = mutableComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid)
try! audioCompositionTrack.insertTimeRange(CMTimeRange(start: kCMTimeZero, duration:audioAssetTrack.timeRange.duration), of: audioAssetTrack, at: kCMTimeZero)
// Create a `videoComposition` to represent the `foregroundImage`
let videoSize: CGSize = videoCompositionTrack.naturalSize
let frame = CGRect(x: 0.0, y: 0.0, width: videoSize.width, height: videoSize.height)
let imageLayer = CALayer()
imageLayer.contents = foregroundImage.cgImage
imageLayer.frame = frame
let videoLayer = CALayer()
videoLayer.frame = frame
let animationLayer = CALayer()
animationLayer.frame = frame
animationLayer.addSublayer(videoLayer)
animationLayer.addSublayer(imageLayer)
let videoComposition = AVMutableVideoComposition(propertiesOf: videoCompositionTrack.asset!)
videoComposition.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, in: animationLayer)
// Export the video
let documentDirectory = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.cachesDirectory, FileManager.SearchPathDomainMask.userDomainMask, true).first!
let documentDirectoryUrl = URL(fileURLWithPath: documentDirectory)
let destinationFilePath = documentDirectoryUrl.appendingPathComponent("video_\(NSUUID().uuidString).mov")
let exportSession = AVAssetExportSession( asset: mutableComposition, presetName: AVAssetExportPresetHighestQuality)!
exportSession.videoComposition = videoComposition
exportSession.outputURL = destinationFilePath
exportSession.outputFileType = AVFileTypeQuickTimeMovie
exportSession.exportAsynchronously { [weak exportSession] in
if let strongExportSession = exportSession {
completion(strongExportSession)
}
}
return exportSession
}
我正在尝试将单个视频与单个图像结合起来。 这不是试图将许多图像组合成一个视频，例如
How do I export UIImage array as a movie?
Make movie file with picture Array and song file, using AVAsset
我正在使用 AVMutableComposition 合并曲目。我的应用程序能够组合视频和图像（但就目前而言，视频组合很好！）我尝试使用 AVAssetWriter 将单个图像转换为视频（我相信这是我的问题所在，但不是 100% 肯定）。然后我将其保存到应用程序 (documents directory)。从那里，我在我的合并中访问它，并将视频和现在变成视频的图像组合起来。
流量：
用户选择图像 ->
图像到 AVAssetWriter 以更改为视频 ->
将我已经预设的视频与视频合并->
结果：使用所选图像和预设视频制作 1 个视频。
我所拥有的问题：我的代码提供了一个空白 space，视频中的图像应该在该位置。比如，我拥有的 ImageConverter 文件会将其转换为视频，但我只会看到最后一帧作为图像，而其他每一帧都是透明的，就好像图片不存在一样。因此，如果我将图像转换为视频 5 秒（假设为 30 frames/sec），那么我将看到空白 space (30*5)-1 帧，然后是最后一帧，图片终于会出现。我只是在寻找有关如何将单个图像制作成视频的指导 或 将视频和图像组合在一起而不将图像转换为视频。谢谢！
在此处合并文件
func merge() {
if let firstAsset = controller.firstAsset, secondAsset = self.asset {
// 1 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
let mixComposition = AVMutableComposition()
let firstTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo,
preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
do {
try firstTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, CMTime(seconds: 8, preferredTimescale: 600)),
ofTrack: firstAsset.tracksWithMediaType(AVMediaTypeVideo)[0] ,
atTime: kCMTimeZero)
} catch _ {
print("Failed to load first track")
}
do {
//HERE THE TIME IS 0.666667, BUT SHOULD BE 0
print(CMTimeGetSeconds(secondAsset.duration), CMTimeGetSeconds(firstTrack.timeRange.duration))
try firstTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, secondAsset.duration),
ofTrack: secondAsset.tracksWithMediaType(AVMediaTypeVideo)[0],
atTime: firstTrack.timeRange.duration)
} catch _ {
print("Failed to load second track")
}
do {
try firstTrack.insertTimeRange(CMTimeRangeMake(CMTime(seconds: 8+CMTimeGetSeconds(secondAsset.duration), preferredTimescale: 600), firstAsset.duration),
ofTrack: firstAsset.tracksWithMediaType(AVMediaTypeVideo)[0] ,
atTime: firstTrack.timeRange.duration+secondTrack.timeRange.duration)
} catch _ {
print("failed")
}
// 3 - Audio track
if let loadedAudioAsset = controller.audioAsset {
let audioTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: 0)
do {
try audioTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, firstAsset.duration),
ofTrack: loadedAudioAsset.tracksWithMediaType(AVMediaTypeAudio)[0] ,
atTime: kCMTimeZero)
} catch _ {
print("Failed to load Audio track")
}
}
// 4 - Get path
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .LongStyle
dateFormatter.timeStyle = .ShortStyle
let date = dateFormatter.stringFromDate(NSDate())
let savePath = (documentDirectory as NSString).stringByAppendingPathComponent("mergeVideo.mov")
let url = NSURL(fileURLWithPath: savePath)
_ = try? NSFileManager().removeItemAtURL(url)
// 5 - Create Exporter
print("exporting")
guard let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality) else { return }
exporter.outputURL = url
exporter.outputFileType = AVFileTypeQuickTimeMovie
exporter.shouldOptimizeForNetworkUse = false
exporter.videoComposition = mainComposition
// 6 - Perform the Export
controller.currentlyEditing = true
exporter.exportAsynchronouslyWithCompletionHandler() {
dispatch_async(dispatch_get_main_queue()) { _ in
print("done")
self.controller.currentlyEditing = false
self.controller.merged = true
self.button.blurView.superview?.hidden = true
self.controller.player.replaceCurrentItemWithPlayerItem(AVPlayerItem(URL: url))
self.controller.firstAsset = AVAsset(URL: url)
}
}
}
}
func exportDidFinish(session: AVAssetExportSession) {
if session.status == AVAssetExportSessionStatus.Failed {
print(session.error)
}
if session.status == AVAssetExportSessionStatus.Completed {
print("succed")
}
}
在此处转换图像
class MyConverter: NSObject {
var image:UIImage!
convenience init(image:UIImage) {
self.init()
self.image = image
}
var outputURL: NSURL {
let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let savePath = (documentDirectory as NSString).stringByAppendingPathComponent("mergeVideo-pic.mov")
return getURL(savePath)
}
func getURL(path:String) -> NSURL {
let movieDestinationUrl = NSURL(fileURLWithPath: path)
_ = try? NSFileManager().removeItemAtURL(movieDestinationUrl)
let url = NSURL(fileURLWithPath: path)
return url
}
func build(completion:() -> Void) {
guard let videoWriter = try? AVAssetWriter(URL: outputURL, fileType: AVFileTypeQuickTimeMovie) else {
fatalError("AVAssetWriter error")
}
let outputSettings = [AVVideoCodecKey : AVVideoCodecH264, AVVideoWidthKey : NSNumber(float: Float(image.size.width)), AVVideoHeightKey : NSNumber(float: Float(image.size.height))]
guard videoWriter.canApplyOutputSettings(outputSettings, forMediaType: AVMediaTypeVideo) else {
fatalError("Negative : Can't apply the Output settings...")
}
let videoWriterInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: outputSettings)
let sourcePixelBufferAttributesDictionary = [kCVPixelBufferPixelFormatTypeKey as String : NSNumber(unsignedInt: kCVPixelFormatType_32ARGB), kCVPixelBufferWidthKey as String: NSNumber(float: Float(image.size.width)), kCVPixelBufferHeightKey as String: NSNumber(float: Float(image.size.height))]
let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
if videoWriter.canAddInput(videoWriterInput) {
videoWriter.addInput(videoWriterInput)
}
if videoWriter.startWriting() {
videoWriter.startSessionAtSourceTime(kCMTimeZero)
assert(pixelBufferAdaptor.pixelBufferPool != nil)
}
let media_queue = dispatch_queue_create("mediaInputQueue", nil)
videoWriterInput.requestMediaDataWhenReadyOnQueue(media_queue, usingBlock: { () -> Void in
var appendSucceeded = true
//Time HERE IS ZERO, but in Merge file, it is 0.66667
let presentationTime = CMTimeMake(0, 600)
var pixelBuffer: CVPixelBuffer? = nil
let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferAdaptor.pixelBufferPool!, &pixelBuffer)
if let pixelBuffer = pixelBuffer where status == 0 {
let managedPixelBuffer = pixelBuffer
CVPixelBufferLockBaseAddress(managedPixelBuffer, 0)
let data = CVPixelBufferGetBaseAddress(managedPixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGBitmapContextCreate(data, Int(self.image.size.width), Int(self.image.size.height), 8, CVPixelBufferGetBytesPerRow(managedPixelBuffer), rgbColorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue)
CGContextClearRect(context, CGRectMake(0, 0, CGFloat(self.image.size.width), CGFloat(self.image.size.height)))
CGContextDrawImage(context, CGRectMake(0, 0, self.image.size.width, self.image.size.height), self.image.CGImage)
CVPixelBufferUnlockBaseAddress(managedPixelBuffer, 0)
appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: presentationTime)
} else {
print("Failed to allocate pixel buffer")
appendSucceeded = false
}
if !appendSucceeded {
print("append failed")
}
videoWriterInput.markAsFinished()
videoWriter.finishWritingWithCompletionHandler { () -> Void in
print("FINISHED!!!!!")
completion()
}
})
}
}
注意： 我发现如果我在 ImageConverter 内部执行 print(presentationTime) 它会打印 0，然后在合并内打印持续时间的时间，我得到 0.666667
注意： 还没有答案，但我会不断地把这个问题设为悬赏，直到我找到答案或有人帮助我！谢谢！
对，所以我前阵子确实处理过这个问题。问题确实在于您如何从图片创建视频。您需要做的是在时间为零时添加像素缓冲区，然后在最后添加 AGAIN，否则您将在最后一帧之前得到一个空视频，就像您正在经历的那样。
以下代码将是我更新您的代码的最佳尝试。最后，我将 post 我的解决方案 Objective-C 以防它对其他人有帮助。
func build(completion:() -> Void) {
guard let videoWriter = try? AVAssetWriter(URL: outputURL, fileType: AVFileTypeQuickTimeMovie) else {
fatalError("AVAssetWriter error")
}
// This might not be a problem for you but width HAS to be divisible by 16 or the movie will come out distorted... don't ask me why. So this is a safeguard
let pixelsToRemove: Double = fmod(image.size.width, 16)
let pixelsToAdd: Double = 16 - pixelsToRemove
let size: CGSize = CGSizeMake(image.size.width + pixelsToAdd, image.size.height)
let outputSettings = [AVVideoCodecKey : AVVideoCodecH264, AVVideoWidthKey : NSNumber(float: Float(size.width)), AVVideoHeightKey : NSNumber(float: Float(size.height))]
guard videoWriter.canApplyOutputSettings(outputSettings, forMediaType: AVMediaTypeVideo) else {
fatalError("Negative : Can't apply the Output settings...")
}
let videoWriterInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: outputSettings)
let sourcePixelBufferAttributesDictionary = [kCVPixelBufferPixelFormatTypeKey as String : NSNumber(unsignedInt: kCVPixelFormatType_32ARGB), kCVPixelBufferWidthKey as String: NSNumber(float: Float(size.width)), kCVPixelBufferHeightKey as String: NSNumber(float: Float(size.height))]
let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
if videoWriter.canAddInput(videoWriterInput) {
videoWriter.addInput(videoWriterInput)
}
if videoWriter.startWriting() {
videoWriter.startSessionAtSourceTime(kCMTimeZero)
assert(pixelBufferAdaptor.pixelBufferPool != nil)
}
// For simplicity, I'm going to remove the media queue you created and instead explicitly wait until I can append since i am only writing one pixel buffer at two different times
var pixelBufferCreated = true
var pixelBuffer: CVPixelBuffer? = nil
let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferAdaptor.pixelBufferPool!, &pixelBuffer)
if let pixelBuffer = pixelBuffer where status == 0 {
let managedPixelBuffer = pixelBuffer
CVPixelBufferLockBaseAddress(managedPixelBuffer, 0)
let data = CVPixelBufferGetBaseAddress(managedPixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGBitmapContextCreate(data, Int(size.width), Int(size.height), 8, CVPixelBufferGetBytesPerRow(managedPixelBuffer), rgbColorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue)
CGContextClearRect(context, CGRectMake(0, 0, CGFloat(size.width), CGFloat(size.height)))
CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), self.image.CGImage)
CVPixelBufferUnlockBaseAddress(managedPixelBuffer, 0)
} else {
print("Failed to allocate pixel buffer")
pixelBufferCreated = false
}
if (pixelBufferCreated) {
// Here is where the magic happens, we have our pixelBuffer it's time to start writing
// FIRST - add at time zero
var appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: kCMTimeZero];
if (!appendSucceeded) {
// something went wrong, up to you to handle. Should probably return so the rest of the code is not executed though
}
// SECOND - wait until the writer is ready for more data with an empty while
while !writerInput.readyForMoreMediaData {}
// THIRD - make a CMTime with the desired length of your picture-video. I am going to arbitrarily make it 5 seconds here
let frameTime: CMTime = CMTimeMake(5, 1) // 5 seconds
// FOURTH - add the same exact pixel to the end of the video you are creating
appendSucceeded = pixelBufferAdaptor.appendPixelBuffer(pixelBuffer, withPresentationTime: frameTime];
if (!appendSucceeded) {
// something went wrong, up to you to handle. Should probably return so the rest of the code is not executed though
}
videoWriterInput.markAsFinished() {
videoWriter.endSessionAtSourceTime(frameTime)
}
videoWriter.finishWritingWithCompletionHandler { () -> Void in
if videoWriter.status != .Completed {
// Error writing the video... handle appropriately
} else {
print("FINISHED!!!!!")
completion()
}
}
}
}
我是如何在 Obj-C 中做到这一点的
注意：我必须进行一些编辑才能使其独立，因此此方法将 return 一个字符串，其中包含视频 将 写入的路径。它是在视频写入完成之前 return 编辑的，因此如果您不小心 可能 可以在它准备好之前访问它
-(NSString *)makeMovieFromImageData:(NSData *)imageData {
NSError *error;
UIImage *image = [UIImage imageWithData:imageData];
// width has to be divisible by 16 or the movie comes out distorted... don't ask me why
double pixelsToRemove = fmod(image.size.width, 16);
double pixelsToAdd = 16 - pixelsToRemove;
CGSize size = CGSizeMake(image.size.width+pixelsToAdd, image.size.height);
BOOL hasFoundValidPath = NO;
NSURL *tempFileURL;
NSString *outputFile;
while (!hasFoundValidPath) {
NSString *guid = [[NSUUID new] UUIDString];
outputFile = [NSString stringWithFormat:@"picture_%@.mp4", guid];
NSString *outputDirectory = [NSSearchPathForDirectoriesInDomains(NSTemporaryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *tempPath = [outputDirectory stringByAppendingPathComponent:outputFile];
// Will fail if destination already has a file
if ([[NSFileManager defaultManager] fileExistsAtPath:tempPath]) {
continue;
} else {
hasFoundValidPath = YES;
}
tempFileURL = [NSURL fileURLWithPath:tempPath];
}
// Start writing
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:tempFileURL
fileType:AVFileTypeQuickTimeMovie
error:&error];
if (error) {
// handle error
}
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:size.width], AVVideoWidthKey,
[NSNumber numberWithInt:size.height], AVVideoHeightKey,
nil];
AVAssetWriterInput* writerInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings];
NSDictionary *bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil];
AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
sourcePixelBufferAttributes:bufferAttributes];
if ([videoWriter canAddInput:writerInput]) {
[videoWriter addInput:writerInput];
} else {
// handle error
}
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CGImageRef img = [image CGImage];
// Now I am going to create the bixelBuffer
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef buffer = NULL;
CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, size.width,
size.height, kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options,
&pxbuffer);
if ( !(status == kCVReturnSuccess && pxbuffer != NULL) ) {
NSLog(@"There be some issue. We didn't get a buffer from the image");
}
CVPixelBufferLockBaseAddress(buffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(buffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
size.height, 8, 4*size.width, rgbColorSpace,
(CGBitmapInfo)kCGImageAlphaPremultipliedFirst);
CGContextSetRGBFillColor(context, 0, 0, 0, 0);
CGContextConcatCTM(context, CGAffineTransformIdentity);
CGContextDrawImage(context, CGRectMake(0, 0, size.width,
size.height), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(buffer, 0);
// At this point we have our buffer so we are going to start by adding to time zero
[adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];
while (!writerInput.readyForMoreMediaData) {} // wait until ready
CMTime frameTime = CMTimeMake(5, 1); // 5 second frame
[adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
CFRelease(buffer);
[writerInput markAsFinished];
[videoWriter endSessionAtSourceTime:frameTime];
[videoWriter finishWritingWithCompletionHandler:^{
if (videoWriter.status != AVAssetWriterStatusCompleted) {
// Error
}
}]; // end videoWriter finishWriting Block
// NOTE: the URL is actually being returned before the videoWriter finishes writing so be careful to not access it until it's ready
return outputFile;
}
这是对我有用的我希望这对你有用:-
-(void)MixVideo:(NSString *)vidioUrlString withImage:(UIImage *)img
{
NSURL *videoUrl1 = [[NSURL alloc] initFileURLWithPath:vidioUrlString];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl1 options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];
CGSize sizeOfVideo = CGSizeMake(320, 568);
//Image of watermark
UIImage *myImage=img;
CALayer *layerCa = [CALayer layer];
layerCa.contents = (id)myImage.CGImage;
layerCa.frame = CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
layerCa.opacity = 1.0;
CALayer *parentLayer=[CALayer layer];
CALayer *videoLayer=[CALayer layer];
parentLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
videoLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:layerCa];
AVMutableVideoComposition *videoComposition=[AVMutableVideoComposition videoComposition] ;
videoComposition.frameDuration=CMTimeMake(1, 30);
videoComposition.renderSize=sizeOfVideo;
videoComposition.animationTool=[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComposition.instructions = [NSArray arrayWithObject: instruction];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
finalPath = [documentsDirectory stringByAppendingFormat:@"/myVideo.mp4"];
if ([[NSFileManager defaultManager] fileExistsAtPath:finalPath])
{
[[NSFileManager defaultManager] removeItemAtPath:finalPath error:nil];
}
SDAVAssetExportSession *encoder = [SDAVAssetExportSession.alloc initWithAsset:mixComposition];
encoder.outputFileType = AVFileTypeMPEG4;
encoder.outputURL = [NSURL fileURLWithPath:finalPath];
encoder.videoComposition=videoComposition;
encoder.videoSettings = @
{
AVVideoCodecKey: AVVideoCodecH264,
AVVideoWidthKey: @320,
AVVideoHeightKey: @568,
AVVideoCompressionPropertiesKey: @
{
AVVideoAverageBitRateKey: @900000,
AVVideoProfileLevelKey: AVVideoProfileLevelH264MainAutoLevel,
},
};
encoder.audioSettings = @
{
AVFormatIDKey: @(kAudioFormatMPEG4AAC),
AVNumberOfChannelsKey: @2,
AVSampleRateKey: @44100,
AVEncoderBitRateKey: @128000,
};
[encoder exportAsynchronouslyWithCompletionHandler:^
{
if (encoder.status == AVAssetExportSessionStatusCompleted)
{
NSLog(@"Video export succeeded");
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(finalPath))
{
NSLog(@"Video exported successfully path = %@ ",finalPath);
}
}
else if (encoder.status == AVAssetExportSessionStatusCancelled)
{
NSLog(@"Video export cancelled");
}
else
{
NSLog(@"Video export failed with error: %@ (%ld)", encoder.error.localizedDescription, (long)encoder.error.code);
}
}];
}
这对我有用，将单个图像导出到视频（视频是可移动的而不是静态的）。 Swift3.
//
// CXEImageToAssetURL.swift
// CXEngine
//
// Created by wulei on 16/12/14.
// Copyright © 2016年 wulei. All rights reserved.
//
import Foundation
import AVFoundation
import UIKit
import Photos
fileprivate extension UIImage{
func normalizedImage() -> UIImage?{
// if self.imageOrientation == .up{
// return self
// }
let factor = CGFloat(0.8)
UIGraphicsBeginImageContextWithOptions(CGSize(width:self.size.width * factor, height: self.size.height * factor), false, self.scale)
self.draw(in: CGRect(x: 0, y: 0, width: self.size.width * factor, height: self.size.height * factor))
let normalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return normalImage
}
// func clipImage() -> UIImage {
// var x = CGFloat(0)
// var y = CGFloat(0)
// let imageHeight = (self.size.width * 9) / 16
// y = (self.size.height - imageHeight)/2
// var rcTmp = CGRect(origin: CGPoint(x: x, y: y), size: self.size)
// if self.scale > 1.0 {
// rcTmp = CGRect(x: rcTmp.origin.x * self.scale, y: rcTmp.origin.y * self.scale, width: rcTmp.size.width * self.scale, height: rcTmp.size.height * self.scale)
// }
// rcTmp.size.height = imageHeight
// let imageRef = self.cgImage!.cropping(to: rcTmp)
// let result = UIImage(cgImage: imageRef!, scale: self.scale, orientation: self.imageOrientation)
// return result
// return self
// }
}
public typealias CXEImageToVideoProgress = (Float) -> Void
typealias CXEMovieMakerUIImageExtractor = (AnyObject) -> UIImage?
public class CXEImageToVideo: NSObject{
//MARK: Private Properties
private var assetWriter:AVAssetWriter!
private var writeInput:AVAssetWriterInput!
private var bufferAdapter:AVAssetWriterInputPixelBufferAdaptor!
private var videoSettings:[String : Any]!
private var frameTime:CMTime!
private var fileURL:URL!
private var duration:Int = 0
//MARK: Class Method
private func videoSettingsFunc(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: AVVideoCodecH264,
AVVideoWidthKey: width,
AVVideoHeightKey: height]
return videoSettings
}
//MARK: Public methods
public init(fileURL: URL, videoWidth:Int, videoHeight:Int) {
super.init()
self.videoSettings = videoSettingsFunc(width: videoWidth, height: videoHeight)
self.fileURL = fileURL
self.assetWriter = try! AVAssetWriter(url: self.fileURL, fileType: AVFileTypeQuickTimeMovie)
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, 25)
}
// public func createMovieFrom(url: URL, duration:Int, progressExtractor: CXEImageToVideoProgress){
// self.duration = duration
// self.createMovieFromSource(image: url as AnyObject, extractor:{(inputObject:AnyObject) ->UIImage? in
// return UIImage(data: try! Data(contentsOf: inputObject as! URL))}, progressExtractor: progressExtractor)
// }
public func createMovieFrom(imageData: Data, duration:Int, progressExtractor: CXEImageToVideoProgress){
var image = UIImage(data: imageData)
image = image?.normalizedImage()
assert(image != nil)
self.duration = duration
self.createMovieFromSource(image: image!, extractor: {(inputObject:AnyObject) -> UIImage? in
return inputObject as? UIImage}, progressExtractor: progressExtractor)
}
//MARK: Private methods
private func createMovieFromSource(image: AnyObject, extractor: @escaping CXEMovieMakerUIImageExtractor, progressExtractor: CXEImageToVideoProgress){
self.assetWriter.startWriting()
let zeroTime = CMTimeMake(Int64(0),self.frameTime.timescale)
self.assetWriter.startSession(atSourceTime: zeroTime)
while !self.writeInput.isReadyForMoreMediaData {
usleep(100)
}
var sampleBuffer:CVPixelBuffer?
var pxDataBuffer:CVPixelBuffer?
let img = extractor(image)
assert(img != nil)
let options:[String: Any] = [kCVPixelBufferCGImageCompatibilityKey as String: true, kCVPixelBufferCGBitmapContextCompatibilityKey as String: true]
let frameHeight = self.videoSettings[AVVideoHeightKey] as! Int
let frameWidth = self.videoSettings[AVVideoWidthKey] as! Int
let originHeight = frameWidth * img!.cgImage!.height / img!.cgImage!.width
let heightDifference = originHeight - frameHeight
let frameCounts = self.duration * Int(self.frameTime.timescale)
let spacingOfHeight = heightDifference / frameCounts
sampleBuffer = self.newPixelBufferFrom(cgImage: img!.cgImage!)
assert(sampleBuffer != nil)
var presentTime = CMTimeMake(1, self.frameTime.timescale)
var stepRows = 0
for i in 0..<frameCounts {
progressExtractor(Float(i) / Float(frameCounts))
CVPixelBufferLockBaseAddress(sampleBuffer!, CVPixelBufferLockFlags(rawValue: 0))
let pointer = CVPixelBufferGetBaseAddress(sampleBuffer!)
var pxData = pointer?.assumingMemoryBound(to: UInt8.self)
let bytes = CVPixelBufferGetBytesPerRow(sampleBuffer!) * stepRows
pxData = pxData?.advanced(by: bytes)
let status = CVPixelBufferCreateWithBytes(kCFAllocatorDefault, frameWidth, frameHeight, kCVPixelFormatType_32ARGB, pxData!, CVPixelBufferGetBytesPerRow(sampleBuffer!), nil, nil, options as CFDictionary?, &pxDataBuffer)
assert(status == kCVReturnSuccess && pxDataBuffer != nil, "newPixelBuffer failed")
CVPixelBufferUnlockBaseAddress(sampleBuffer!, CVPixelBufferLockFlags(rawValue: 0))
while !self.writeInput.isReadyForMoreMediaData {
usleep(100)
}
if (self.writeInput.isReadyForMoreMediaData){
if i == 0{
self.bufferAdapter.append(pxDataBuffer!, withPresentationTime: zeroTime)
}else{
self.bufferAdapter.append(pxDataBuffer!, withPresentationTime: presentTime)
}
presentTime = CMTimeAdd(presentTime, self.frameTime)
}
stepRows += spacingOfHeight
}
self.writeInput.markAsFinished()
self.assetWriter.finishWriting {}
var isSuccess:Bool = false
while(!isSuccess){
switch self.assetWriter.status {
case .completed:
isSuccess = true
print("completed")
case .writing:
usleep(100)
print("writing")
case .failed:
isSuccess = true
print("failed")
case .cancelled:
isSuccess = true
print("cancelled")
default:
isSuccess = true
print("unknown")
}
}
}
private 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 originHeight = frameWidth * cgImage.height / cgImage.width
let status = CVPixelBufferCreate(kCFAllocatorDefault, frameWidth, originHeight, 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: originHeight, 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: frameWidth, height: originHeight))
CVPixelBufferUnlockBaseAddress(pxbuffer!, CVPixelBufferLockFlags(rawValue: 0))
return pxbuffer
}
}
Swift 3 代码，应该是一个好的开始。如果在生产中使用，仍然需要错误处理和处理某些视频的视频大小/方向。
@discardableResult func merge(
video videoPath: String,
withForegroundImage foregroundImage: UIImage,
completion: @escaping (AVAssetExportSession) -> Void) -> AVAssetExportSession {
let videoUrl = URL(fileURLWithPath: videoPath)
let videoUrlAsset = AVURLAsset(url: videoUrl, options: nil)
// Setup `mutableComposition` from the existing video
let mutableComposition = AVMutableComposition()
let videoAssetTrack = videoUrlAsset.tracks(withMediaType: AVMediaTypeVideo).first!
let videoCompositionTrack = mutableComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
videoCompositionTrack.preferredTransform = videoAssetTrack.preferredTransform
try! videoCompositionTrack.insertTimeRange(CMTimeRange(start:kCMTimeZero, duration:videoAssetTrack.timeRange.duration), of: videoAssetTrack, at: kCMTimeZero)
let audioAssetTrack = videoUrlAsset.tracks(withMediaType: AVMediaTypeAudio).first!
let audioCompositionTrack = mutableComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid)
try! audioCompositionTrack.insertTimeRange(CMTimeRange(start: kCMTimeZero, duration:audioAssetTrack.timeRange.duration), of: audioAssetTrack, at: kCMTimeZero)
// Create a `videoComposition` to represent the `foregroundImage`
let videoSize: CGSize = videoCompositionTrack.naturalSize
let frame = CGRect(x: 0.0, y: 0.0, width: videoSize.width, height: videoSize.height)
let imageLayer = CALayer()
imageLayer.contents = foregroundImage.cgImage
imageLayer.frame = frame
let videoLayer = CALayer()
videoLayer.frame = frame
let animationLayer = CALayer()
animationLayer.frame = frame
animationLayer.addSublayer(videoLayer)
animationLayer.addSublayer(imageLayer)
let videoComposition = AVMutableVideoComposition(propertiesOf: videoCompositionTrack.asset!)
videoComposition.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, in: animationLayer)
// Export the video
let documentDirectory = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.cachesDirectory, FileManager.SearchPathDomainMask.userDomainMask, true).first!
let documentDirectoryUrl = URL(fileURLWithPath: documentDirectory)
let destinationFilePath = documentDirectoryUrl.appendingPathComponent("video_\(NSUUID().uuidString).mov")
let exportSession = AVAssetExportSession( asset: mutableComposition, presetName: AVAssetExportPresetHighestQuality)!
exportSession.videoComposition = videoComposition
exportSession.outputURL = destinationFilePath
exportSession.outputFileType = AVFileTypeQuickTimeMovie
exportSession.exportAsynchronously { [weak exportSession] in
if let strongExportSession = exportSession {
completion(strongExportSession)
}
}
return exportSession
}