How to add Text for some duration of video in iOS SDK

I have video having duration 4:00. Now I want to add text in video file as per the frames of video. Say for example from 00:30 to 1:50 duration I want to add text "Welcome". Now from 3:00 to 4:00 duration of video I want to add text "Awesome". How to achieve this functionality. I have referred below tutorial. It adds text in whole video not for some duration of video. https://www.raywenderlich.com/30200/avfoundation-tutorial-adding-overlays-and-animations-to-videos

Any help will be appriciated.

I am adding lines of code for add text on whole video:

- (void)applyVideoEffectsToComposition:(AVMutableVideoComposition *)composition size:(CGSize)size {     // 1 - Set up the text layer     CATextLayer *subtitle1Text = [[CATextLayer alloc] init];     [subtitle1Text setFont:@"Helvetica-Bold"];     [subtitle1Text setFontSize:36];     [subtitle1Text setFrame:CGRectMake(0, 0, size.width, 100)];     [subtitle1Text setString:_subTitle1.text];     [subtitle1Text setAlignmentMode:kCAAlignmentCenter];     [subtitle1Text setForegroundColor:[[UIColor whiteColor] CGColor]];      // 2 - The usual overlay     CALayer *overlayLayer = [CALayer layer];     [overlayLayer addSublayer:subtitle1Text];     overlayLayer.frame = CGRectMake(0, 0, size.width, size.height);     [overlayLayer setMasksToBounds:YES];      CALayer *parentLayer = [CALayer layer];     CALayer *videoLayer = [CALayer layer];     parentLayer.frame = CGRectMake(0, 0, size.width, size.height);     videoLayer.frame = CGRectMake(0, 0, size.width, size.height);     [parentLayer addSublayer:videoLayer];     [parentLayer addSublayer:overlayLayer];      composition.animationTool = [AVVideoCompositionCoreAnimationTool                                  videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];  } 

2 Answers

Answers 1

Edit Does this answer work for you? You will have to add multiple text layers, and use a CABasicAnimation to show/hide each at the appropriate time (using setBeginTime:).

Original Answer Basically, just maintain a reference to the CATextLayer in this section of code, and use an NSTimer called every second to update your text:

// 1 - Set up the text layer CATextLayer *subtitle1Text = [[CATextLayer alloc] init];  self.textLayer = subtitle1Text; // ### Keep a reference to this object and update it in timerDidFire ...  - (void)viewDidLoad{     ...     // Add a timer at some point.  Don't forget to invalidate it later     NSTimer *timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(timerDidFire) userInfo:nil repeats:YES];     [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];     ... }  - (void)timerDidFire{     if (currentPlaybackPosition <= some_value){         [self.textLayer setText:@"Welcome"];     } else if (currentPlaybackPosition <= some_bigger_value){         [self.textLayer setText:@"Awesome"];     }     ... } 

Answers 2

Look at your linked website: https://www.raywenderlich.com/30200/avfoundation-tutorial-adding-overlays-and-animations-to-videos Just use 2 CATextLayer's as shown there. Set their texts.

Set the first ones beginTime property to 30 seconds and its duration property to 80 seconds. The 2nd with a beginTime of 180 seconds and a duration of 60 seconds.

The result will be exported as it is shown in a video player.

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