iOS - swift - merge videos using AVFoundation - ios

Question

I'm trying to merge some videos in a unique output.mov. The exported file isn't playable and I don't now why. Can someone 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 have to merge are all readable so I think the problem is in the last part, where the output video is exported.

Answer 1

Resolved.
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
}
}