Swift Merge audio and video files into one video
Improved code (of Govind's answer) with some additional features:
- Merge audio of the video + external audio (the initial answer was dropping the sound of the video)
- Flip video horizontally if needed (I personally use it when user captures using frontal camera, btw instagram flips it too)
- Apply
preferredTransformcorrectly which solves the issue when video was saved rotated (video is external: captured by other device/generated by other app) - Removed some unused code with VideoComposition.
- Added a completion handler to the method so that it can be called from a different class.
- Update to Swift 4.
Step 1.
import UIKit
import AVFoundation
import AVKit
import AssetsLibrary
Step 2.
/// Merges video and sound while keeping sound of the video too
///
/// - Parameters:
/// - videoUrl: URL to video file
/// - audioUrl: URL to audio file
/// - shouldFlipHorizontally: pass True if video was recorded using frontal camera otherwise pass False
/// - completion: completion of saving: error or url with final video
func mergeVideoAndAudio(videoUrl: URL,
audioUrl: URL,
shouldFlipHorizontally: Bool = false,
completion: @escaping (_ error: Error?, _ url: URL?) -> Void) {
let mixComposition = AVMutableComposition()
var mutableCompositionVideoTrack = [AVMutableCompositionTrack]()
var mutableCompositionAudioTrack = [AVMutableCompositionTrack]()
var mutableCompositionAudioOfVideoTrack = [AVMutableCompositionTrack]()
//start merge
let aVideoAsset = AVAsset(url: videoUrl)
let aAudioAsset = AVAsset(url: audioUrl)
let compositionAddVideo = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo,
preferredTrackID: kCMPersistentTrackID_Invalid)
let compositionAddAudio = mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio,
preferredTrackID: kCMPersistentTrackID_Invalid)
let compositionAddAudioOfVideo = mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio,
preferredTrackID: kCMPersistentTrackID_Invalid)
let aVideoAssetTrack: AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
let aAudioOfVideoAssetTrack: AVAssetTrack? = aVideoAsset.tracks(withMediaType: AVMediaTypeAudio).first
let aAudioAssetTrack: AVAssetTrack = aAudioAsset.tracks(withMediaType: AVMediaTypeAudio)[0]
// Default must have tranformation
compositionAddVideo.preferredTransform = aVideoAssetTrack.preferredTransform
if shouldFlipHorizontally {
// Flip video horizontally
var frontalTransform: CGAffineTransform = CGAffineTransform(scaleX: -1.0, y: 1.0)
frontalTransform = frontalTransform.translatedBy(x: -aVideoAssetTrack.naturalSize.width, y: 0.0)
frontalTransform = frontalTransform.translatedBy(x: 0.0, y: -aVideoAssetTrack.naturalSize.width)
compositionAddVideo.preferredTransform = frontalTransform
}
mutableCompositionVideoTrack.append(compositionAddVideo)
mutableCompositionAudioTrack.append(compositionAddAudio)
mutableCompositionAudioOfVideoTrack.append(compositionAddAudioOfVideo)
do {
try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,
aVideoAssetTrack.timeRange.duration),
of: aVideoAssetTrack,
at: kCMTimeZero)
//In my case my audio file is longer then video file so i took videoAsset duration
//instead of audioAsset duration
try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,
aVideoAssetTrack.timeRange.duration),
of: aAudioAssetTrack,
at: kCMTimeZero)
// adding audio (of the video if exists) asset to the final composition
if let aAudioOfVideoAssetTrack = aAudioOfVideoAssetTrack {
try mutableCompositionAudioOfVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,
aVideoAssetTrack.timeRange.duration),
of: aAudioOfVideoAssetTrack,
at: kCMTimeZero)
}
} catch {
print(error.localizedDescription)
}
// Exporting
let savePathUrl: URL = URL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")
do { // delete old video
try FileManager.default.removeItem(at: savePathUrl)
} catch { print(error.localizedDescription) }
let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
assetExport.outputFileType = AVFileTypeMPEG4
assetExport.outputURL = savePathUrl
assetExport.shouldOptimizeForNetworkUse = true
assetExport.exportAsynchronously { () -> Void in
switch assetExport.status {
case AVAssetExportSessionStatus.completed:
print("success")
completion(nil, savePathUrl)
case AVAssetExportSessionStatus.failed:
print("failed \(assetExport.error?.localizedDescription ?? "error nil")")
completion(assetExport.error, nil)
case AVAssetExportSessionStatus.cancelled:
print("cancelled \(assetExport.error?.localizedDescription ?? "error nil")")
completion(assetExport.error, nil)
default:
print("complete")
completion(assetExport.error, nil)
}
}
}
Again thanks to @Govind's answer! It helped me a lot!
Hope this update helps someone too:)
In Above question same error I found due to wrong savePathUrl, destination URL should be like below code including new video name.
I was looking for the code to Merge audio and video files into one video but couldn't find anywhere so after spending hours while reading apple docs I wrote this code.
NOTE : This is tested and 100% working code for me.
Stap : 1 Import this modules in your viewController.
import UIKit
import AVFoundation
import AVKit
import AssetsLibrary
step 2: Add this function in your code
func mergeFilesWithUrl(videoUrl:NSURL, audioUrl:NSURL)
{
let mixComposition : AVMutableComposition = AVMutableComposition()
var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
//start merge
let aVideoAsset : AVAsset = AVAsset(URL: videoUrl)
let aAudioAsset : AVAsset = AVAsset(URL: audioUrl)
mutableCompositionVideoTrack.append(mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
mutableCompositionAudioTrack.append( mixComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracksWithMediaType(AVMediaTypeVideo)[0]
let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracksWithMediaType(AVMediaTypeAudio)[0]
do{
try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aVideoAssetTrack, atTime: kCMTimeZero)
//In my case my audio file is longer then video file so i took videoAsset duration
//instead of audioAsset duration
try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
//Use this instead above line if your audiofile and video file's playing durations are same
// try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
}catch{
}
totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration )
let mutableVideoComposition : AVMutableVideoComposition = AVMutableVideoComposition()
mutableVideoComposition.frameDuration = CMTimeMake(1, 30)
mutableVideoComposition.renderSize = CGSizeMake(1280,720)
// playerItem = AVPlayerItem(asset: mixComposition)
// player = AVPlayer(playerItem: playerItem!)
//
//
// AVPlayerVC.player = player
//find your video on this URl
let savePathUrl : NSURL = NSURL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")
let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
assetExport.outputFileType = AVFileTypeMPEG4
assetExport.outputURL = savePathUrl
assetExport.shouldOptimizeForNetworkUse = true
assetExport.exportAsynchronouslyWithCompletionHandler { () -> Void in
switch assetExport.status {
case AVAssetExportSessionStatus.Completed:
//Uncomment this if u want to store your video in asset
//let assetsLib = ALAssetsLibrary()
//assetsLib.writeVideoAtPathToSavedPhotosAlbum(savePathUrl, completionBlock: nil)
print("success")
case AVAssetExportSessionStatus.Failed:
print("failed \(assetExport.error)")
case AVAssetExportSessionStatus.Cancelled:
print("cancelled \(assetExport.error)")
default:
print("complete")
}
}
}
Step 3: Call function where u want like this
let videoUrl : NSURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("SampleVideo", ofType: "mp4")!)
let audioUrl : NSURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("SampleAudio", ofType: "mp3")!)
mergeFilesWithUrl(videoUrl, audioUrl: audioUrl)
hope this will help you and will save your time.
Swift 4.2 / 5
func mergeVideoWithAudio(videoUrl: URL, audioUrl: URL, success: @escaping ((URL) -> Void), failure: @escaping ((Error?) -> Void)) {
let mixComposition: AVMutableComposition = AVMutableComposition()
var mutableCompositionVideoTrack: [AVMutableCompositionTrack] = []
var mutableCompositionAudioTrack: [AVMutableCompositionTrack] = []
let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
let aVideoAsset: AVAsset = AVAsset(url: videoUrl)
let aAudioAsset: AVAsset = AVAsset(url: audioUrl)
if let videoTrack = mixComposition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid), let audioTrack = mixComposition.addMutableTrack(withMediaType: .audio, preferredTrackID: kCMPersistentTrackID_Invalid) {
mutableCompositionVideoTrack.append(videoTrack)
mutableCompositionAudioTrack.append(audioTrack)
if let aVideoAssetTrack: AVAssetTrack = aVideoAsset.tracks(withMediaType: .video).first, let aAudioAssetTrack: AVAssetTrack = aAudioAsset.tracks(withMediaType: .audio).first {
do {
try mutableCompositionVideoTrack.first?.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: aVideoAssetTrack.timeRange.duration), of: aVideoAssetTrack, at: CMTime.zero)
try mutableCompositionAudioTrack.first?.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: aVideoAssetTrack.timeRange.duration), of: aAudioAssetTrack, at: CMTime.zero)
videoTrack.preferredTransform = aVideoAssetTrack.preferredTransform
} catch{
print(error)
}
totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(start: CMTime.zero,duration: aVideoAssetTrack.timeRange.duration)
}
}
let mutableVideoComposition: AVMutableVideoComposition = AVMutableVideoComposition()
mutableVideoComposition.frameDuration = CMTimeMake(value: 1, timescale: 30)
mutableVideoComposition.renderSize = CGSize(width: 480, height: 640)
if let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {
let outputURL = URL(fileURLWithPath: documentsPath).appendingPathComponent("\("fileName").m4v")
do {
if FileManager.default.fileExists(atPath: outputURL.path) {
try FileManager.default.removeItem(at: outputURL)
}
} catch { }
if let exportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality) {
exportSession.outputURL = outputURL
exportSession.outputFileType = AVFileType.mp4
exportSession.shouldOptimizeForNetworkUse = true
/// try to export the file and handle the status cases
exportSession.exportAsynchronously(completionHandler: {
switch exportSession.status {
case .failed:
if let _error = exportSession.error {
failure(_error)
}
case .cancelled:
if let _error = exportSession.error {
failure(_error)
}
default:
print("finished")
success(outputURL)
}
})
} else {
failure(nil)
}
}
}
Version Swift3 with URL and new syntax.
func mergeFilesWithUrl(videoUrl:URL, audioUrl:URL)
{
let mixComposition : AVMutableComposition = AVMutableComposition()
var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
//start merge
let aVideoAsset : AVAsset = AVAsset(url: videoUrl)
let aAudioAsset : AVAsset = AVAsset(url: audioUrl)
mutableCompositionVideoTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
mutableCompositionAudioTrack.append( mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracks(withMediaType: AVMediaTypeAudio)[0]
do{
try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aVideoAssetTrack, at: kCMTimeZero)
//In my case my audio file is longer then video file so i took videoAsset duration
//instead of audioAsset duration
try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aAudioAssetTrack, at: kCMTimeZero)
//Use this instead above line if your audiofile and video file's playing durations are same
// try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
}catch{
}
totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration )
let mutableVideoComposition : AVMutableVideoComposition = AVMutableVideoComposition()
mutableVideoComposition.frameDuration = CMTimeMake(1, 30)
mutableVideoComposition.renderSize = CGSize(width: 1280, height: 720)
// playerItem = AVPlayerItem(asset: mixComposition)
// player = AVPlayer(playerItem: playerItem!)
//
//
// AVPlayerVC.player = player
//find your video on this URl
let savePathUrl : URL = URL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")
let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
assetExport.outputFileType = AVFileTypeMPEG4
assetExport.outputURL = savePathUrl
assetExport.shouldOptimizeForNetworkUse = true
assetExport.exportAsynchronously { () -> Void in
switch assetExport.status {
case AVAssetExportSessionStatus.completed:
//Uncomment this if u want to store your video in asset
//let assetsLib = ALAssetsLibrary()
//assetsLib.writeVideoAtPathToSavedPhotosAlbum(savePathUrl, completionBlock: nil)
print("success")
case AVAssetExportSessionStatus.failed:
print("failed \(assetExport.error)")
case AVAssetExportSessionStatus.cancelled:
print("cancelled \(assetExport.error)")
default:
print("complete")
}
}
}