Видео -кадм -шоу перевернуто ⇐ IOS

[Anonymous]

Func CreateComposition (с активом: Avasset, Sizeratio: CGPoint, Centerratio: CGPoint) -> (Mixcomposition: AvmutableCoposion, VideoComposition: AvmutableVideOcomposition)? {
let mixcomposition = avmutablecomposion () < /p>

Код: Выделить всё

    guard let videoTrack = mixComposition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid),
let vTrack = asset.tracks(withMediaType: .video).first else {
return nil
}

do {
try videoTrack.insertTimeRange(CMTimeRange(start: .zero, duration: asset.duration), of: vTrack, at: .zero)
} catch {
return nil
}

let videoComposition = AVMutableVideoComposition()
let instruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack)

// Get video orientation and natural size
let naturalSize = vTrack.naturalSize
let transform = vTrack.preferredTransform

let isPortrait = abs(transform.b) == 1 && abs(transform.c) == 1
let videoSize = isPortrait ? CGSize(width: naturalSize.height, height: naturalSize.width) : naturalSize

// Calculate crop area
let cropWidth = round(videoSize.width * sizeRatio.x)
let cropHeight = round(videoSize.height * sizeRatio.y)
let cropX = videoSize.width * centerRatio.x - cropWidth / 2
let cropY = videoSize.height * centerRatio.y - cropHeight / 2

let oriantation = orientation(from: transform)
var finalTransform : CGAffineTransform = .identity

switch oriantation {
case .down:
finalTransform = finalTransform
.translatedBy(x: 0 - cropX, y: naturalSize.width - cropY)
.rotated(by: -.pi / 2)
case .right:
finalTransform = finalTransform.translatedBy(x: 0 - cropX, y: 0 - cropY)
case .up:
finalTransform = finalTransform
.translatedBy(x: naturalSize.height - cropX, y: 0 - cropY)
.rotated(by: .pi / 2)
case .left:
finalTransform = finalTransform
.translatedBy(x: naturalSize.width - cropX, y: naturalSize.height - cropY)
.rotated(by: -.pi)
case .upMirrored:
finalTransform = finalTransform
.translatedBy(x: naturalSize.height - cropX, y: 0 - cropY)
.rotated(by: .pi / 2)
case .downMirrored:
finalTransform = finalTransform
.translatedBy(x: 0 - cropX, y: naturalSize.width - cropY)
.rotated(by: -.pi / 2)

case .leftMirrored:
finalTransform = finalTransform
.translatedBy(x: naturalSize.width - cropX, y: naturalSize.height - cropY)
.rotated(by: -.pi / 2)
case .rightMirrored:
finalTransform = finalTransform.translatedBy(x: 0 - cropX, y: 0 - cropY)
}

instruction.setTransform(finalTransform, at: .zero)

// Instruction setup
let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRange(start: .zero, duration: asset.duration)
mainInstruction.layerInstructions = [instruction]

// Final video composition setup
videoComposition.instructions = [mainInstruction]
videoComposition.renderSize = CGSize(width: cropWidth, height: cropHeight)
videoComposition.frameDuration = CMTimeMake(value: 1, timescale: 30) // Safe fallback

return (mixComposition, videoComposition)
}

enum Orientation {
case up
case down
case left
case right
case upMirrored
case downMirrored
case leftMirrored
case rightMirrored
}
func orientation(from transform: CGAffineTransform) ->  Orientation {
// Round small floating-point errors
let a = round(transform.a * 1000) / 1000
let b = round(transform.b * 1000) / 1000
let c = round(transform.c * 1000) / 1000
let d = round(transform.d * 1000) / 1000

switch (a, b, c, d) {
case (0, 1, -1, 0): return .up          // 90° rotation
case (0, 1, 1, 0): return .upMirrored   // 90° rotation + mirror
case (0, -1, 1, 0): return .down        // 270° rotation
case (0, -1, -1, 0): return .downMirrored // 270° rotation + mirror
case (1, 0, 0, 1): return .right        // 0° (identity)
case (-1, 0, 0, 1): return .rightMirrored // 0° + mirror horizontally
case (-1, 0, 0, -1): return .left       // 180° rotation
case (1, 0, 0, -1): return .leftMirrored // 180° + mirror
default: return .up // fallback
}
}

вот код
Я не могу изменить проблему с переворотом видео, когда ориентация на видео - это зеркало, я не могу рассчитать фактическое преобразование.

Подробнее здесь: https://stackoverflow.com/questions/796 ... ow-flipped