I have this code that resizes a video from 1280 x 720 to 640 x 360 But i want a resize with no crop.
Is there a way to do a full resize the don't crop ?
Here's the code
class func resizer(inputURL : NSURL , completion: (outPutURL : NSURL?) -> Void ){
let videoAsset = AVAsset(URL: inputURL) as AVAsset
let clipVideoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo).first! as AVAssetTrack
let composition = AVMutableComposition()
composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = CGSizeMake(360,640)
videoComposition.frameDuration = CMTimeMake(1, 30)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(180, 30))
let transformer : AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)
let t1 = CGAffineTransformMakeTranslation(360, 0)
let t2 = CGAffineTransformRotate(t1, CGFloat(M_PI_2))
// let t2 = CGAffineTransformMakeRotation(CGFloat(M_PI_2))
transformer.setTransform(t2, atTime: kCMTimeZero)
instruction.layerInstructions = [transformer]
videoComposition.instructions = [instruction]
let formatter = NSDateFormatter()
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'"
let date = NSDate()
let tempDir = NSTemporaryDirectory().stringByAppendingString(formatter.stringFromDate(date))
let d = "\(tempDir).mp4"
let outputURL = NSURL(fileURLWithPath: d)
let exporter = AVAssetExportSession(asset: videoAsset, presetName: AVAssetExportPresetHighestQuality)
exporter!.videoComposition = videoComposition
exporter!.outputURL = outputURL
exporter!.outputFileType = AVFileTypeQuickTimeMovie
exporter?.exportAsynchronouslyWithCompletionHandler({ () -> Void in
dispatch_async(dispatch_get_main_queue(), {
completion(outPutURL: outputURL)
})
})
}
I think what you're looking for (resize with no crop) is to SCALE the video too. Try using CGAffineTransformScale / MakeScale as well.
https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CGAffineTransform/#//apple_ref/c/func/CGAffineTransformMakeScale
Given you have a ratio of 0.5 (1280 / 640) you could try this:
let t3 = CGAffineTransformScale(t2, 0.5, 0.5)
transformer.setTransform(t3, atTime: kCMTimeZero)
If it doesn't look right, you may also need to adjust the translate by the scale ratio too.
In Swift 4
let playerLayer = AVPlayerLayer(player: player)
let transform = CGAffineTransform.init(scaleX: 0.5, y: 0.5)
playerLayer.setAffineTransform(transform)
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