嗨,
努力旋转此视频以正确的方向显示并填满整个屏幕。
我无法通过视频冲击获得avasset但无法使其正常工作。
let videoAsset: AVAsset = AVAsset(URL: outputFileURL) as AVAsset
let clipVideoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo).first! as AVAssetTrack
let newHeight = CGFloat(clipVideoTrack.naturalSize.height/3*4)
let composition = AVMutableComposition()
composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
let videoComposition = AVMutableVideoComposition()
var videoSize = CGSize()
videoSize = clipVideoTrack.naturalSize
videoComposition.renderSize = videoSize
videoComposition.frameDuration = CMTimeMake(1, 30)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(180, 30))
// rotate to portrait
let transformer:AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)
let t1 = CGAffineTransformMakeTranslation(0, 0);
let t2 = CGAffineTransformRotate(t1, 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 documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as NSString
let outputPath = "\(documentsPath)/\(formatter.stringFromDate(date)).mp4"
let outputURL = NSURL(fileURLWithPath: outputPath)
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(), {
self.handleExportCompletion(exporter)
})
})
解决了以下代码中的旋转转换:
AVMutableVideoComposition rotated video captured in portrait mode
如果有人知道,现在有问题导出问题: https://stackoverflow.com/questions/35233766/avasset-failing-to-export