Swift merge .ts or mpeg files - swift

Question

I have an array of local files, I downloaded them from a .m3u8 playlist, since i have to save for later local playing.
All the files are in .ts format, and I want to merge them all in a single video file. I already tried to merge the files using AVMutableComposition, I tried to convert all local files to a AVAsset but the property .tracks always return 0, so i presume the AVAsset was incorrect, then I tried to rename all the files to MPEG but the problem still the same.
Does anyone have any idea on how to, read correctly those files, here is my code so far :
func mergeAllVideos(filesPath: URL) {
let allVideos = extractAllFile(atPath: filesPath.absoluteString)
var arrayVideos = [AVURLAsset]()
var atTimeM: CMTime = CMTimeMake(0, 0)
var lastAsset: AVAsset!
var layerInstructionsArray = [AVVideoCompositionLayerInstruction]()
var completeTrackDuration: CMTime = CMTimeMake(0, 1)
var videoSize: CGSize = CGSize(width: 0.0, height: 0.0)
var totalTime : CMTime = CMTimeMake(0, 0)
for asset in allVideos.enumerated() {
if let url = URL(string: asset.element) {
let newAsset = AVURLAsset(url: url)
arrayVideos.append(newAsset)
}
}
let mixComposition = AVMutableComposition()
for videoAsset in arrayVideos {
let player = AVPlayer(url: videoAsset.url)
let videoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
do {
if videoAsset == arrayVideos.first{
atTimeM = kCMTimeZero
} else{
atTimeM = totalTime
}
print(videoAsset.tracks)
try videoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAsset.tracks(withMediaType: AVMediaTypeVideo)[0], at: atTimeM)
videoSize = videoTrack.naturalSize
} catch let error as NSError {
print("error: \(error)")
}
totalTime = CMTimeAdd(totalTime, videoAsset.duration)
completeTrackDuration = CMTimeAdd(completeTrackDuration, videoAsset.duration)
let videoInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack)
if let asset = arrayVideos.last, videoAsset != asset {
videoInstruction.setOpacity(0.0, at: completeTrackDuration)
}
layerInstructionsArray.append(videoInstruction)
lastAsset = videoAsset
}
let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, completeTrackDuration)
mainInstruction.layerInstructions = layerInstructionsArray
let mainComposition = AVMutableVideoComposition()
mainComposition.instructions = [mainInstruction]
mainComposition.frameDuration = CMTimeMake(1, 30)
mainComposition.renderSize = CGSize(width: videoSize.width, height: videoSize.height)
let documentDirectory = NSSearchPathForDirectoriesInDomains(.developerApplicationDirectory, .userDomainMask, true)[0]
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .short
let date = dateFormatter.string(from: NSDate() as Date)
let savePath = (documentDirectory as NSString).appendingPathComponent("mergeVideo-\(date).mov")
let url = NSURL(fileURLWithPath: savePath)
let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
exporter!.outputURL = url as URL
exporter!.outputFileType = AVFileTypeQuickTimeMovie
exporter!.shouldOptimizeForNetworkUse = true
exporter!.videoComposition = mainComposition
exporter!.exportAsynchronously {
print("exported")
}
}

Answer 1

You can't work with .tsfiles, also renaming of .tv extension to .mp4 will not be enough
You need to translate .tv file to mp4. You can use this lib https://github.com/Keemotion/TS2MP4 for this
And then you will be able to mix videos