IOS - fast video merge using AVFoundation

Question

I am trying to combine some videos in a unique output.mov. The exported file does not play, and now I do not understand why. Can anybody help me?

func exportVideo2(path:String, outputPath:String, nMovie:Int) -> Bool{ var composition = AVMutableComposition() let track:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID()) var insertTime = kCMTimeZero var movie = movieOfProject(path) if movie.count == nMovie{ for (index,mov) in enumerate(movie){ let moviePath = path.stringByAppendingPathComponent(mov) // moviePath = path to the .mov file println(moviePath) let moviePathUrl = NSURL(fileURLWithPath: moviePath) let sourceAsset = AVURLAsset(URL: moviePathUrl, options: nil) println(sourceAsset) let tracks = sourceAsset.tracksWithMediaType(AVMediaTypeVideo) println(sourceAsset.playable) // print true println(sourceAsset.exportable) // print true println(sourceAsset.readable) // print true if tracks.count > 0{ let assetTrack:AVAssetTrack = tracks[0] as AVAssetTrack track.insertTimeRange(CMTimeRangeMake(kCMTimeZero,sourceAsset.duration), ofTrack: assetTrack, atTime: insertTime, error: nil) insertTime = CMTimeAdd(insertTime, sourceAsset.duration) } } let completeMovie = outputPath.stringByAppendingPathComponent("movie.mov") let completeMovieUrl = NSURL(fileURLWithPath: completeMovie) var exporter = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality) exporter.outputURL = completeMovieUrl exporter.outputFileType = AVFileTypeMPEG4 exporter.exportAsynchronouslyWithCompletionHandler(nil) let ass = AVURLAsset(URL: completeMovieUrl, options: nil) println(ass.readable) // print false println(ass.exportable) // print false println(ass.playable) // print false return true }else{ return false } } 

The .mov files that I need to combine are readable, so I think the problem is in the last part where the output video is exported.

Answer 1

Decided.

 func exportVideo3(path:String, outputPath:String, nMovie:Int) -> Bool{ var composition = AVMutableComposition() let trackVideo:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID()) let trackAudio:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID()) var insertTime = kCMTimeZero var movie = movieOfProject(path) if movie.count == nMovie{ for (index,mov) in enumerate(movie){ let moviePath = path.stringByAppendingPathComponent(mov) let moviePathUrl = NSURL(fileURLWithPath: moviePath) let sourceAsset = AVURLAsset(URL: moviePathUrl, options: nil) let tracks = sourceAsset.tracksWithMediaType(AVMediaTypeVideo) let audios = sourceAsset.tracksWithMediaType(AVMediaTypeAudio) if tracks.count > 0{ let assetTrack:AVAssetTrack = tracks[0] as AVAssetTrack trackVideo.insertTimeRange(CMTimeRangeMake(kCMTimeZero,sourceAsset.duration), ofTrack: assetTrack, atTime: insertTime, error: nil) let assetTrackAudio:AVAssetTrack = audios[0] as AVAssetTrack trackAudio.insertTimeRange(CMTimeRangeMake(kCMTimeZero,sourceAsset.duration), ofTrack: assetTrackAudio, atTime: insertTime, error: nil) insertTime = CMTimeAdd(insertTime, sourceAsset.duration) } } let completeMovie = outputPath.stringByAppendingPathComponent("movie.mov") let completeMovieUrl = NSURL(fileURLWithPath: completeMovie) var exporter = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality) exporter.outputURL = completeMovieUrl exporter.outputFileType = AVFileTypeMPEG4 //AVFileTypeQuickTimeMovie exporter.exportAsynchronouslyWithCompletionHandler({ switch exporter.status{ case AVAssetExportSessionStatus.Failed: println("failed \(exporter.error)") case AVAssetExportSessionStatus.Cancelled: println("cancelled \(exporter.error)") default: println("complete") } }) return true }else{ return false } }