我想将视频裁剪成方形,但我无法做到这一点。
我将this code转换为快速,但导出视频后我只获得了黑屏
var videoComposition: AVMutableVideoComposition = AVMutableVideoComposition()
videoComposition.frameDuration = CMTimeMake(1, 60)
videoComposition.renderSize = CGSizeMake(clipVideoTrack.naturalSize.height, clipVideoTrack.naturalSize.height)
var instruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30))
var transformer: AVMutableVideoCompositionLayerInstruction =
AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)
var t1: CGAffineTransform = CGAffineTransformMakeTranslation(clipVideoTrack.naturalSize.height, 0)
var t2: CGAffineTransform = CGAffineTransformRotate(t1, CGFloat(M_PI_2))
var finalTransform: CGAffineTransform = t2
transformer.setTransform(finalTransform, atTime: kCMTimeZero)
instruction.layerInstructions = NSArray(object: transformer)
videoComposition.instructions = NSArray(object: instruction)
var documentsPath: NSString = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,.UserDomainMask,true)[0] as NSString
var exportPath: NSString = documentsPath.stringByAppendingFormat("/xvideo.mov")
var exportUrl: NSURL = NSURL.fileURLWithPath(exportPath)!
var exporter = AVAssetExportSession(asset: asset!, presetName: AVAssetExportPresetHighestQuality)
exporter.videoComposition = videoComposition
exporter.outputFileType = AVFileTypeQuickTimeMovie
exporter.outputURL = exportUrl
我缺少什么?
答案 0 :(得分:4)
您最后错过了导出块,以便使用您创建的AVAssetExportSession
执行导出操作:
exporter.exportAsynchronouslyWithCompletionHandler({
//display video after export is complete, for example...
let outputURL:NSURL = exporter.outputURL;
let asset:AVURLAsset = AVURLAsset(URL: outputURL, options: nil)
let newPlayerItem:AVPlayerItem = AVPlayerItem(asset: asset)
self.mPlayer = AVPlayer.playerWithPlayerItem(newPlayerItem) as AVPlayer
})