问题
I am developing a Video based Application in Swift. Where I am exporting a Video clip with Watermark logo and Fade In Out effect. Here is my code:
func watermark(video videoAsset:AVAsset, videoModal:VideoModel, watermarkText text : String!, imageName name : String!, saveToLibrary flag : Bool, watermarkPosition position : PDWatermarkPosition, withMode mode: SpeedoVideoMode, completion : ((_ status : AVAssetExportSessionStatus?, _ session: AVAssetExportSession?, _ outputURL : URL?) -> ())?) {
var arrayLayerInstructions:[AVMutableVideoCompositionLayerInstruction] = []
let servicemodel = ServiceModel()
DispatchQueue.global(qos: DispatchQoS.QoSClass.default).sync {
let mixComposition = AVMutableComposition()
let compositionVideoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
if videoAsset.tracks(withMediaType: AVMediaTypeVideo).count == 0
{
completion!(nil, nil, nil)
return
}
let clipVideoTrack = videoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
self.addAudioTrack(composition: mixComposition, videoAsset: videoAsset as! AVURLAsset, withMode: mode, videoModal:videoModal)
do {
try compositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: clipVideoTrack, at: kCMTimeZero)
}
catch {
print(error.localizedDescription)
}
let videoSize = clipVideoTrack.naturalSize //CGSize(width: 375, height: 300)
//to add Watermark
let parentLayer = CALayer()
let videoLayer = CALayer()
parentLayer.frame = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
videoLayer.frame = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
//videoLayer.backgroundColor = UIColor.red.cgColor
parentLayer.addSublayer(videoLayer)
if name != nil {
let watermarkImage = UIImage(named: name)
let imageLayer = CALayer()
//imageLayer.backgroundColor = UIColor.purple.cgColor
imageLayer.contents = watermarkImage?.cgImage
var xPosition : CGFloat = 0.0
var yPosition : CGFloat = 0.0
let imageSize : CGFloat = 150
switch (position) {
case .TopLeft:
xPosition = 0
yPosition = 0
break
case .TopRight:
xPosition = videoSize.width - imageSize - 100
yPosition = 80
break
case .BottomLeft:
xPosition = 0
yPosition = videoSize.height - imageSize
break
case .BottomRight, .Default:
xPosition = videoSize.width - imageSize
yPosition = videoSize.height - imageSize
break
}
imageLayer.frame = CGRect(x: xPosition, y: yPosition, width: imageSize, height: imageSize)
imageLayer.opacity = 0.75
parentLayer.addSublayer(imageLayer)
if text != nil {
let titleLayer = CATextLayer()
titleLayer.backgroundColor = UIColor.clear.cgColor
titleLayer.string = text
titleLayer.font = "Helvetica" as CFTypeRef
titleLayer.fontSize = 20
titleLayer.alignmentMode = kCAAlignmentRight
titleLayer.frame = CGRect(x: 0, y: yPosition - imageSize, width: videoSize.width - imageSize/2 - 4, height: 57)
titleLayer.foregroundColor = UIColor.lightGray.cgColor
parentLayer.addSublayer(titleLayer)
}
}
let videoComp = AVMutableVideoComposition()
videoComp.renderSize = videoSize
videoComp.frameDuration = CMTimeMake(1, 30)
videoComp.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, in: parentLayer)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, mixComposition.duration)
_ = mixComposition.tracks(withMediaType: AVMediaTypeVideo)[0] as AVAssetTrack
let layerInstruction = self.videoCompositionInstructionForTrack(track: compositionVideoTrack, asset: videoAsset)
//Add Fade In Out effects
let startTime = CMTime(seconds: Double(0), preferredTimescale: 1000)
let endTime = CMTime(seconds: Double(1), preferredTimescale: 1000)
let timeRange = CMTimeRange(start: startTime, end: endTime)
layerInstruction.setOpacityRamp(fromStartOpacity: 0.1, toEndOpacity: 1.0, timeRange: timeRange)
let startTime1 = CMTime(seconds: videoAsset.duration.seconds-1, preferredTimescale: 1000)
let endTime1 = CMTime(seconds: videoAsset.duration.seconds, preferredTimescale: 1000)
let timeRange1 = CMTimeRange(start: startTime1, end: endTime1)
layerInstruction.setOpacityRamp(fromStartOpacity: 1.0, toEndOpacity: 0.1, timeRange: timeRange1)
arrayLayerInstructions.append(layerInstruction)
instruction.layerInstructions = arrayLayerInstructions
videoComp.instructions = [instruction]
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let url = URL(fileURLWithPath: documentDirectory).appendingPathComponent("\(videoModal.fileID).mov")
let filePath = url.path
let fileManager = FileManager.default
do {
if fileManager.fileExists(atPath: filePath) {
print("FILE AVAILABLE")
try fileManager.removeItem(atPath:filePath)
} else {
print("FILE NOT AVAILABLE")
}
} catch _ {
}
let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
exporter?.outputURL = url
exporter?.outputFileType = AVFileTypeQuickTimeMovie
let timeRangetoTrim = CMTimeRange(start: CMTime(seconds: Double(videoModal.leftRangeValue), preferredTimescale: 1000),
end: CMTime(seconds: Double(videoModal.rightRangeValue), preferredTimescale: 1000))
exporter?.timeRange = timeRangetoTrim
exporter?.shouldOptimizeForNetworkUse = false
exporter?.videoComposition = videoComp
exporter?.exportAsynchronously() {
DispatchQueue.main.async {
if exporter?.status == AVAssetExportSessionStatus.completed {
let outputURL = exporter?.outputURL
if flag {
if UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(outputURL!.path) {
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: outputURL!)
}) { saved, error in
if saved {
completion!(AVAssetExportSessionStatus.completed, exporter, outputURL)
}
}
}
} else {
completion!(AVAssetExportSessionStatus.completed, exporter, outputURL)
}
} else {
// Error
completion!(exporter?.status, exporter, nil)// Getting error here
}
}
}
}
}
func addAudioTrack(composition: AVMutableComposition, videoAsset: AVURLAsset, withMode mode: SpeedoVideoMode, videoModal:VideoFileModel) {
let compositionAudioTrack:AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
let audioTracks = videoAsset.tracks(withMediaType: AVMediaTypeAudio)
for audioTrack in audioTracks {
try! compositionAudioTrack.insertTimeRange(audioTrack.timeRange, of: audioTrack, at: kCMTimeZero)
}
}
func videoCompositionInstructionForTrack(track: AVCompositionTrack, asset: AVAsset) -> AVMutableVideoCompositionLayerInstruction {
let instruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
let assetTrack = asset.tracks(withMediaType: AVMediaTypeVideo)[0]
let transform = assetTrack.preferredTransform
let assetInfo = orientationFromTransform(transform: transform)
var scaleToFitRatio = UIScreen.main.bounds.width / 375
if assetInfo.isPortrait {
scaleToFitRatio = UIScreen.main.bounds.width / assetTrack.naturalSize.height
let scaleFactor = CGAffineTransform(scaleX: scaleToFitRatio, y: scaleToFitRatio)
instruction.setTransform(assetTrack.preferredTransform.concatenating(scaleFactor),
at: kCMTimeZero)
} else {
let scaleFactor = CGAffineTransform(scaleX: scaleToFitRatio, y: scaleToFitRatio)
var concat = assetTrack.preferredTransform.concatenating(scaleFactor).concatenating(CGAffineTransform(translationX: 0, y: 0))
if assetInfo.orientation == .down {
let fixUpsideDown = CGAffineTransform(rotationAngle: CGFloat(Double.pi))
let windowBounds = UIScreen.main.bounds
let yFix = 375 + windowBounds.height
let centerFix = CGAffineTransform(translationX: assetTrack.naturalSize.width, y: CGFloat(yFix))
concat = fixUpsideDown.concatenating(centerFix).concatenating(scaleFactor)
}
instruction.setTransform(concat, at: kCMTimeZero)
}
return instruction
}
private func orientationFromTransform(transform: CGAffineTransform) -> (orientation: UIImageOrientation, isPortrait: Bool) {
var assetOrientation = UIImageOrientation.up
var isPortrait = false
if transform.a == 0 && transform.b == 1.0 && transform.c == -1.0 && transform.d == 0 {
assetOrientation = .right
isPortrait = true
} else if transform.a == 0 && transform.b == -1.0 && transform.c == 1.0 && transform.d == 0 {
assetOrientation = .left
isPortrait = true
} else if transform.a == 1.0 && transform.b == 0 && transform.c == 0 && transform.d == 1.0 {
assetOrientation = .up
} else if transform.a == -1.0 && transform.b == 0 && transform.c == 0 && transform.d == -1.0 {
assetOrientation = .down
}
return (assetOrientation, isPortrait)
}
My code is working fine for some of the videos and sometimes it's not working for some videos too. I am getting below error due to AVAssetExportSessionStatus failed :
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12780), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x28262c240 {Error Domain=NSOSStatusErrorDomain Code=-12780 "(null)"}}
Can anyone help me on this? Thank you in advance.
回答1:
This method func videoCompositionInstructionForTrack(track: AVCompositionTrack, asset: AVAsset) -> AVMutableVideoCompositionLayerInstruction { is wrong because you need to provide and AVAssetTrack which has the actual videos.
But instead of that, you are passing AVCompositionTrack which is still need to be composed, so replace your method with this func videoCompositionInstructionForTrack(track: AVAssetTrack, asset: AVAsset) -> AVMutableVideoCompositionLayerInstruction {.
Now when you are calling the actual method, you need to pass clipVideoTrack, i.e., let layerInstruction = self.videoCompositionInstructionForTrack(track: clipVideoTrack, asset: videoAsset).
let me know, if you are still facing the error!
来源：https://stackoverflow.com/questions/56930602/avassetexportsession-avfoundationerrordomain-code-11800-the-operation-could-not