I am using video merging tutorial in that in ray wenderlich. I always get an 90 degree rotated video.When I add some different caffeine rotation codes my videos can t seen. Can you advise me I code that include CGAffineTransformMakeRotation.
My code is below
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)
}
func videoCompositionInstructionForTrack(track: AVCompositionTrack, asset: AVAsset) -> AVMutableVideoCompositionLayerInstruction {
// 1
let instruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
// 2
let assetTrack = asset.tracksWithMediaType(AVMediaTypeVideo)[0] as! AVAssetTrack
// 3
var transform = assetTrack.preferredTransform
let assetInfo = orientationFromTransform(transform)
var scaleToFitRatio = UIScreen.mainScreen().bounds.width / assetTrack.naturalSize.width
if assetInfo.isPortrait {
// 4
print("ppppp")
scaleToFitRatio = UIScreen.mainScreen().bounds.width / assetTrack.naturalSize.height
let scaleFactor = CGAffineTransformMakeScale(scaleToFitRatio, scaleToFitRatio)
//instruction.setTransform(t2, atTime: kCMTimeZero)
instruction.setTransform(CGAffineTransformConcat(assetTrack.preferredTransform, scaleFactor),
atTime: kCMTimeZero)
} else {
// 5
let scaleFactor = CGAffineTransformMakeScale(scaleToFitRatio, scaleToFitRatio)
var concat = CGAffineTransformConcat(CGAffineTransformConcat(assetTrack.preferredTransform, scaleFactor), CGAffineTransformMakeTranslation(0, UIScreen.mainScreen().bounds.width / 2))
if assetInfo.orientation == .Down {
print("down")
let fixUpsideDown = CGAffineTransformMakeRotation(CGFloat(M_PI))
let windowBounds = UIScreen.mainScreen().bounds
let yFix = assetTrack.naturalSize.height + windowBounds.height
let centerFix = CGAffineTransformMakeTranslation(assetTrack.naturalSize.width, yFix)
concat = CGAffineTransformConcat(CGAffineTransformConcat(fixUpsideDown, centerFix), scaleFactor)
}
instruction.setTransform(concat, atTime: kCMTimeZero)
}
return instruction
}
A CGAffineTransformRotate operates around a point.
When you rotate the video, it "moves" around that point, including sometimes off the screen.
x--- rotate 90 degrees clockwise around X becomes -----x
| | | |
| | -----
| |
---
Not a great picture but you can see that if x is a fixed point, the video has actually moved.
Anyway, it's easy to fix - you're missing a Translate (literally moving the position of the video within the output frame).
Experiment with CGAffineTranslate (by the scale of the video) and you'll see the frame move around.
Good luck!