I am working on a video editing app in Swift. In my case my output video looks like as following
I am trying to fill the black portion with blur effect exactly like this
我搜索但没有得到任何有效的解决方案。任何帮助都会有很大帮助。
可能我这个答案迟到了，但我仍然没有找到满足此要求的任何解决方案。所以分享我的工作：
在此下载示例代码
Features
合并视频
func mergeVideos(_ videos: Array<AVURLAsset>, inArea area:CGSize, completion: @escaping (_ error: Error?, _ url:URL?) -> Swift.Void) {
// Create AVMutableComposition Object.This object will hold our multiple AVMutableCompositionTrack.
let mixComposition = AVMutableComposition()
var instructionLayers : Array<AVMutableVideoCompositionLayerInstruction> = []
for asset in videos {
// Here we are creating the AVMutableCompositionTrack. See how we are adding a new track to our AVMutableComposition.
let track = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)
// Now we set the length of the track equal to the length of the asset and add the asset to out newly created track at kCMTimeZero for first track and lastAssetTime for current track so video plays from the start of the track to end.
if let videoTrack = asset.tracks(withMediaType: AVMediaType.video).first {
/// Hide time for this video's layer
let opacityStartTime: CMTime = CMTimeMakeWithSeconds(0, asset.duration.timescale)
let opacityEndTime: CMTime = CMTimeAdd(mixComposition.duration, asset.duration)
let hideAfter: CMTime = CMTimeAdd(opacityStartTime, opacityEndTime)
let timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration)
try? track?.insertTimeRange(timeRange, of: videoTrack, at: mixComposition.duration)
/// Layer instrcution
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track!)
layerInstruction.setOpacity(0.0, at: hideAfter)
/// Add logic for aspectFit in given area
let properties = scaleAndPositionInAspectFillMode(forTrack: videoTrack, inArea: area)
/// Checking for orientation
let videoOrientation: UIImageOrientation = self.getVideoOrientation(forTrack: videoTrack)
let assetSize = self.assetSize(forTrack: videoTrack)
if (videoOrientation == .down) {
/// Rotate
let defaultTransfrom = asset.preferredTransform
let rotateTransform = CGAffineTransform(rotationAngle: -CGFloat(Double.pi/2.0))
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
var ytranslation: CGFloat = assetSize.height
var xtranslation: CGFloat = 0
if properties.position.y == 0 {
xtranslation = -(assetSize.width - ((size.width/size.height) * assetSize.height))/2.0
}
else {
ytranslation = assetSize.height - (assetSize.height - ((size.height/size.width) * assetSize.width))/2.0
}
let translationTransform = CGAffineTransform(translationX: xtranslation, y: ytranslation)
// Final transformation - Concatination
let finalTransform = defaultTransfrom.concatenating(rotateTransform).concatenating(translationTransform).concatenating(scaleTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
else if (videoOrientation == .left) {
/// Rotate
let defaultTransfrom = asset.preferredTransform
let rotateTransform = CGAffineTransform(rotationAngle: -CGFloat(Double.pi))
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
var ytranslation: CGFloat = assetSize.height
var xtranslation: CGFloat = assetSize.width
if properties.position.y == 0 {
xtranslation = assetSize.width - (assetSize.width - ((size.width/size.height) * assetSize.height))/2.0
}
else {
ytranslation = assetSize.height - (assetSize.height - ((size.height/size.width) * assetSize.width))/2.0
}
let translationTransform = CGAffineTransform(translationX: xtranslation, y: ytranslation)
// Final transformation - Concatination
let finalTransform = defaultTransfrom.concatenating(rotateTransform).concatenating(translationTransform).concatenating(scaleTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
else if (videoOrientation == .right) {
/// No need to rotate
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
let translationTransform = CGAffineTransform(translationX: properties.position.x, y: properties.position.y)
let finalTransform = scaleTransform.concatenating(translationTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
else {
/// Rotate
let defaultTransfrom = asset.preferredTransform
let rotateTransform = CGAffineTransform(rotationAngle: CGFloat(Double.pi/2.0))
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
var ytranslation: CGFloat = 0
var xtranslation: CGFloat = assetSize.width
if properties.position.y == 0 {
xtranslation = assetSize.width - (assetSize.width - ((size.width/size.height) * assetSize.height))/2.0
}
else {
ytranslation = -(assetSize.height - ((size.height/size.width) * assetSize.width))/2.0
}
let translationTransform = CGAffineTransform(translationX: xtranslation, y: ytranslation)
// Final transformation - Concatination
let finalTransform = defaultTransfrom.concatenating(rotateTransform).concatenating(translationTransform).concatenating(scaleTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
instructionLayers.append(layerInstruction)
}
}
let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, mixComposition.duration)
mainInstruction.layerInstructions = instructionLayers
let mainCompositionInst = AVMutableVideoComposition()
mainCompositionInst.instructions = [mainInstruction]
mainCompositionInst.frameDuration = CMTimeMake(1, 30)
mainCompositionInst.renderSize = area
//let url = URL(fileURLWithPath: "/Users/enacteservices/Desktop/final_video.mov")
let url = self.videoOutputURL
try? FileManager.default.removeItem(at: url)
let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
exporter?.outputURL = url
exporter?.outputFileType = .mp4
exporter?.videoComposition = mainCompositionInst
exporter?.shouldOptimizeForNetworkUse = true
exporter?.exportAsynchronously(completionHandler: {
if let anError = exporter?.error {
completion(anError, nil)
}
else if exporter?.status == AVAssetExportSessionStatus.completed {
completion(nil, url)
}
})
}
添加模糊效果
func addBlurEffect(toVideo asset:AVURLAsset, completion: @escaping (_ error: Error?, _ url:URL?) -> Swift.Void) {
let filter = CIFilter(name: "CIGaussianBlur")
let composition = AVVideoComposition(asset: asset, applyingCIFiltersWithHandler: { request in
// Clamp to avoid blurring transparent pixels at the image edges
let source: CIImage? = request.sourceImage.clampedToExtent()
filter?.setValue(source, forKey: kCIInputImageKey)
filter?.setValue(10.0, forKey: kCIInputRadiusKey)
// Crop the blurred output to the bounds of the original image
let output: CIImage? = filter?.outputImage?.cropped(to: request.sourceImage.extent)
// Provide the filter output to the composition
if let anOutput = output {
request.finish(with: anOutput, context: nil)
}
})
//let url = URL(fileURLWithPath: "/Users/enacteservices/Desktop/final_video.mov")
let url = self.videoOutputURL
// Remove any prevouis videos at that path
try? FileManager.default.removeItem(at: url)
let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality)
// assign all instruction for the video processing (in this case the transformation for cropping the video
exporter?.videoComposition = composition
exporter?.outputFileType = .mp4
exporter?.outputURL = url
exporter?.exportAsynchronously(completionHandler: {
if let anError = exporter?.error {
completion(anError, nil)
}
else if exporter?.status == AVAssetExportSessionStatus.completed {
completion(nil, url)
}
})
}
将一张一张的视频放在模糊视频的中心
这将是您的最终视频网址。
func addAllVideosAtCenterOfBlur(videos: Array<AVURLAsset>, blurVideo: AVURLAsset, completion: @escaping (_ error: Error?, _ url:URL?) -> Swift.Void) {
// Create AVMutableComposition Object.This object will hold our multiple AVMutableCompositionTrack.
let mixComposition = AVMutableComposition()
var instructionLayers : Array<AVMutableVideoCompositionLayerInstruction> = []
// Add blur video first
let blurVideoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)
// Blur layer instruction
if let videoTrack = blurVideo.tracks(withMediaType: AVMediaType.video).first {
let timeRange = CMTimeRangeMake(kCMTimeZero, blurVideo.duration)
try? blurVideoTrack?.insertTimeRange(timeRange, of: videoTrack, at: kCMTimeZero)
}
/// Add other videos at center of the blur video
var startAt = kCMTimeZero
for asset in videos {
/// Time Range of asset
let timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration)
// Here we are creating the AVMutableCompositionTrack. See how we are adding a new track to our AVMutableComposition.
let track = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)
// Now we set the length of the track equal to the length of the asset and add the asset to out newly created track at kCMTimeZero for first track and lastAssetTime for current track so video plays from the start of the track to end.
if let videoTrack = asset.tracks(withMediaType: AVMediaType.video).first {
/// Hide time for this video's layer
let opacityStartTime: CMTime = CMTimeMakeWithSeconds(0, asset.duration.timescale)
let opacityEndTime: CMTime = CMTimeAdd(startAt, asset.duration)
let hideAfter: CMTime = CMTimeAdd(opacityStartTime, opacityEndTime)
/// Adding video track
try? track?.insertTimeRange(timeRange, of: videoTrack, at: startAt)
/// Layer instrcution
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track!)
layerInstruction.setOpacity(0.0, at: hideAfter)
/// Add logic for aspectFit in given area
let properties = scaleAndPositionInAspectFitMode(forTrack: videoTrack, inArea: size)
/// Checking for orientation
let videoOrientation: UIImageOrientation = self.getVideoOrientation(forTrack: videoTrack)
let assetSize = self.assetSize(forTrack: videoTrack)
if (videoOrientation == .down) {
/// Rotate
let defaultTransfrom = asset.preferredTransform
let rotateTransform = CGAffineTransform(rotationAngle: -CGFloat(Double.pi/2.0))
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
var ytranslation: CGFloat = assetSize.height
var xtranslation: CGFloat = 0
if properties.position.y == 0 {
xtranslation = -(assetSize.width - ((size.width/size.height) * assetSize.height))/2.0
}
else {
ytranslation = assetSize.height - (assetSize.height - ((size.height/size.width) * assetSize.width))/2.0
}
let translationTransform = CGAffineTransform(translationX: xtranslation, y: ytranslation)
// Final transformation - Concatination
let finalTransform = defaultTransfrom.concatenating(rotateTransform).concatenating(translationTransform).concatenating(scaleTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
else if (videoOrientation == .left) {
/// Rotate
let defaultTransfrom = asset.preferredTransform
let rotateTransform = CGAffineTransform(rotationAngle: -CGFloat(Double.pi))
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
var ytranslation: CGFloat = assetSize.height
var xtranslation: CGFloat = assetSize.width
if properties.position.y == 0 {
xtranslation = assetSize.width - (assetSize.width - ((size.width/size.height) * assetSize.height))/2.0
}
else {
ytranslation = assetSize.height - (assetSize.height - ((size.height/size.width) * assetSize.width))/2.0
}
let translationTransform = CGAffineTransform(translationX: xtranslation, y: ytranslation)
// Final transformation - Concatination
let finalTransform = defaultTransfrom.concatenating(rotateTransform).concatenating(translationTransform).concatenating(scaleTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
else if (videoOrientation == .right) {
/// No need to rotate
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
let translationTransform = CGAffineTransform(translationX: properties.position.x, y: properties.position.y)
let finalTransform = scaleTransform.concatenating(translationTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
else {
/// Rotate
let defaultTransfrom = asset.preferredTransform
let rotateTransform = CGAffineTransform(rotationAngle: CGFloat(Double.pi/2.0))
// Scale
let scaleTransform = CGAffineTransform(scaleX: properties.scale.width, y: properties.scale.height)
// Translate
var ytranslation: CGFloat = 0
var xtranslation: CGFloat = assetSize.width
if properties.position.y == 0 {
xtranslation = assetSize.width - (assetSize.width - ((size.width/size.height) * assetSize.height))/2.0
}
else {
ytranslation = -(assetSize.height - ((size.height/size.width) * assetSize.width))/2.0
}
let translationTransform = CGAffineTransform(translationX: xtranslation, y: ytranslation)
// Final transformation - Concatination
let finalTransform = defaultTransfrom.concatenating(rotateTransform).concatenating(translationTransform).concatenating(scaleTransform)
layerInstruction.setTransform(finalTransform, at: kCMTimeZero)
}
instructionLayers.append(layerInstruction)
}
/// Adding audio
if let audioTrack = asset.tracks(withMediaType: AVMediaType.audio).first {
let aTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid)
try? aTrack?.insertTimeRange(timeRange, of: audioTrack, at: startAt)
}
// Increase the startAt time
startAt = CMTimeAdd(startAt, asset.duration)
}
/// Blur layer instruction
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: blurVideoTrack!)
instructionLayers.append(layerInstruction)
let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, blurVideo.duration)
mainInstruction.layerInstructions = instructionLayers
let mainCompositionInst = AVMutableVideoComposition()
mainCompositionInst.instructions = [mainInstruction]
mainCompositionInst.frameDuration = CMTimeMake(1, 30)
mainCompositionInst.renderSize = size
//let url = URL(fileURLWithPath: "/Users/enacteservices/Desktop/final_video.mov")
let url = self.videoOutputURL
try? FileManager.default.removeItem(at: url)
let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
exporter?.outputURL = url
exporter?.outputFileType = .mp4
exporter?.videoComposition = mainCompositionInst
exporter?.shouldOptimizeForNetworkUse = true
exporter?.exportAsynchronously(completionHandler: {
if let anError = exporter?.error {
completion(anError, nil)
}
else if exporter?.status == AVAssetExportSessionStatus.completed {
completion(nil, url)
}
})
}
有关上述代码中使用的帮助方法，请下载随附的示例代码。
我也期待您是否有更短的方法来做到这一点。因为我必须将视频导出 3 次才能实现此目的。