Video Trimming - iOS

Core Features

• Video can be trimmed/shortened and played on the same screen
• Video can be trimmed by selecting the starting point and ending point
• Seekbar moves as per selected video for trimming
• After trimming, trimmed video can be played automatically

How it works

• User can select video from gallery
• Set the selected video in the trimming screen
• Trim the video by dragging starting point and end point
• View trimmed video on the trimming screen
• Save video, it will automatically play in next screen

Purpose of this code

• Whenever it is required to crop thr video, this code can help you
• Whenever you are having a limiation of video recording such as allow users to record video for 1 min, this code can help you

Requirements

• iOS 11+

When you can use this code

• When you are developing a Social or standalone video sharing app, this code will help you to provide functinality of trimming video and sharing video with user friendly operations.

Code Snippet

Step 1: Select video from Gallery using imagePickerController()

@IBAction func btnClickSelectVideo(_ sender: UIButton)
{
    let myImagePickerController        = UIImagePickerController()
    myImagePickerController.sourceType = .photoLibrary
    myImagePickerController.mediaTypes = [(kUTTypeMovie) as String]
    myImagePickerController.delegate   = self
    myImagePickerController.isEditing  = false
    self.present(myImagePickerController, animated: true, completion: nil)
    
}

// Image picker to get video url
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])
{
    picker.dismiss(animated: true, completion: nil)
    
    let url = info[UIImagePickerController.InfoKey.mediaURL] as? NSURL
    let asset   = AVURLAsset.init(url: url! as URL)
    let mainstoryBoard = UIStoryboard(name:"Main", bundle: nil)
    let viewcontroller = mainstoryBoard.instantiateViewController(withIdentifier:"ViewController") as! ViewController
    viewcontroller.url = url
    viewcontroller.asset = asset
    self.navigationController?.pushViewController(viewcontroller, animated: true)       
    
}
    }

Step 2: Set video URL in AVPlayerItem

// set video url in AVPlayerItem
    if let assets = asset
    {
        thumbTime = asset.duration
        thumbtimeSeconds      = Int(CMTimeGetSeconds(thumbTime))
        
        self.viewAfterVideoIsPicked()
        
        let item:AVPlayerItem = AVPlayerItem(asset: asset)
        player                = AVPlayer(playerItem: item)
        playerLayer           = AVPlayerLayer(player: player)
        playerLayer.frame     = videoPlayerView.bounds
        
        playerLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
        player.actionAtItemEnd   = AVPlayer.ActionAtItemEnd.none
        
        let tap = UITapGestureRecognizer(target: self, action: #selector(self.tapOnvideoPlayerView))
        self.videoPlayerView.addGestureRecognizer(tap)
        self.tapOnvideoPlayerView(tap: tap)
        
        videoPlayerView.layer.addSublayer(playerLayer)
        player.play()
    }

Step 3: To play video tapOnvideoPlayerView() method is used

//Tap action on video player
@objc func tapOnvideoPlayerView(tap: UITapGestureRecognizer)
{
    if isPlaying
    {
        self.player.play()
    }
    else
    {
        self.player.pause()
    }
    isPlaying = !isPlaying
}

Step 4: To create seekbar createImageFrames() is used

//MARK: CreatingFrameImages
func createImageFrames()
{
    //creating assets
    let assetImgGenerate : AVAssetImageGenerator    = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    assetImgGenerate.requestedTimeToleranceAfter    = CMTime.zero;
    assetImgGenerate.requestedTimeToleranceBefore   = CMTime.zero;
    
    
    assetImgGenerate.appliesPreferredTrackTransform = true
    let thumbTime: CMTime = asset.duration
    let thumbtimeSeconds  = Int(CMTimeGetSeconds(thumbTime))
    let maxLength         = "\(thumbtimeSeconds)" as NSString
    
    let thumbAvg  = thumbtimeSeconds/6
    var startTime = 1
    var startXPosition:CGFloat = 0.0
    
    //loop for 6 number of frames
    for _ in 0...5
    {
        
        let imageButton = UIButton()
        let xPositionForEach = CGFloat(self.imageFrameView.frame.width)/6
        imageButton.frame = CGRect(x: CGFloat(startXPosition), y: CGFloat(0), width: xPositionForEach, height: CGFloat(self.imageFrameView.frame.height))
        do {
            let time:CMTime = CMTimeMakeWithSeconds(Float64(startTime),preferredTimescale: Int32(maxLength.length))
            let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
            let image = UIImage(cgImage: img)
            imageButton.setImage(image, for: .normal)
        }
        catch
            _ as NSError
        {
            print("Image generation failed with error (error)")
        }
        
        startXPosition = startXPosition + xPositionForEach
        startTime = startTime + thumbAvg
        imageButton.isUserInteractionEnabled = false
        imageFrameView.addSubview(imageButton)
    }
    
}

Step 5: createrangSlider() is used to move seekbar as per input from client

//Create range slider
func createrangSlider()
{
    //Remove slider if already present
    let subViews = self.frameContainerView.subviews
    for subview in subViews{
        if subview.tag == 1000 {
            subview.removeFromSuperview()
        }
    }
    
    rangSlider = RangeSlider(frame: frameContainerView.bounds)
    frameContainerView.addSubview(rangSlider)
    rangSlider.tag = 1000
    
    //Range slider action
    rangSlider.addTarget(self, action: #selector(ViewController.rangSliderValueChanged(_:)), for: .valueChanged)
    
    let time = DispatchTime.now() + Double(Int64(NSEC_PER_SEC)) / Double(NSEC_PER_SEC)
    DispatchQueue.main.asyncAfter(deadline: time) {
        self.rangSlider.trackHighlightTintColor = UIColor.clear
        self.rangSlider.curvaceousness = 1.0
    }
    
}

Step 5: To synchronize video frames with time setTimeFrames() is used

//Seek video when slide
func seekVideo(toPos pos: CGFloat) {
    self.videoPlaybackPosition = pos
    let time: CMTime = CMTimeMakeWithSeconds(Float64(self.videoPlaybackPosition), preferredTimescale: self.player.currentTime().timescale)
    self.player.seek(to: time, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero)
    
    if(pos == CGFloat(thumbtimeSeconds))
    {
        self.player.pause()
    }
}

Step 6: cropVideo() method is used to save trimmed video

//Trim Video Function
func cropVideo(sourceURL1: NSURL, startTime:Float, endTime:Float)
{
    let manager                 = FileManager.default
    
    guard let documentDirectory = try? manager.url(for: .documentDirectory,
                                                   in: .userDomainMask,
                                                   appropriateFor: nil,
                                                   create: true) else {return}
    guard let mediaType         = "mp4" as? String else {return}
    guard (sourceURL1 as? NSURL) != nil else {return}
    
    if mediaType == kUTTypeMovie as String || mediaType == "mp4" as String
    {
        let length = Float(asset.duration.value) / Float(asset.duration.timescale)
        print("video length: \(length) seconds")
        
        let start = startTime
        let end = endTime
        print(documentDirectory)
        var outputURL = documentDirectory.appendingPathComponent("output")
        do {
            try manager.createDirectory(at: outputURL, withIntermediateDirectories: true, attributes: nil)
            //let name = hostent.newName()
            outputURL = outputURL.appendingPathComponent("1.mp4")
        }catch let error {
            print(error)
        }

Let us know!

We’d be really happy if you sent us links to your projects where you use our component. Just send an email to biz@cmarix.com and do let us know if you have any questions or suggestion regarding video trimming in iOS.

P.S. We’re going to publish more awesomeness examples on third party libraries, coding standards, plugins etc, in all the technology. Stay tuned!

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License

MIT License

Copyright © 2019 CMARIX TechnoLabs

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.