我正在合并多个视频(实现暂停按钮),除了从后置摄像头和前置摄像头合并视频时,其中一个视频在新视频(合并后的视频)中倒置之外,一切正常。以下是我的代码:
let mixComposition = AVMutableComposition()
let videoTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
let trackAudio = mixComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
var insertTime = kCMTimeZero
for var i = 0; i < currentAssets.count; i++ {
let tracks = currentAssets[i].tracksWithMediaType(AVMediaTypeVideo)
let audios = currentAssets[i].tracksWithMediaType(AVMediaTypeAudio)
let assetTrack:AVAssetTrack = tracks[0] as AVAssetTrack
try videoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, currentAssets[i].duration), ofTrack: assetTrack, atTime: insertTime)
let assetTrackAudio:AVAssetTrack = audios[0] as AVAssetTrack
try trackAudio.insertTimeRange(CMTimeRangeMake(kCMTimeZero, currentAssets[i].duration), ofTrack: assetTrackAudio, atTime: insertTime)
insertTime = CMTimeAdd(insertTime, currentAssets[i].duration)
}
videoTrack.preferredTransform = assetTrack.preferredTransform
let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask).last!
let mediaURL = documentsURL.URLByAppendingPathComponent(AppMediaFolder)
let savePath = mediaURL.URLByAppendingPathComponent("\(NSUUID().UUIDString).mp4").path!
self.createDirectoryIfExists(mediaURL)
let url = NSURL(fileURLWithPath: savePath)
currentAssets.removeAll()
currentAssets.append(AVAsset(URL: url))
//Create Exporter
let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
exporter.outputURL = url
exporter.outputFileType = AVFileTypeMPEG4
exporter.shouldOptimizeForNetworkUse = true