Question

我正在尝试在视频中添加图片（水印）。

这是我的代码。在调试模式下，当我将CLLayer对象添加到父层时，CLLayer对象的帧被正确调整。不知道我在哪里弄错了。我缩放了水印层。一切正常。 Frame的x和宽度和高度完美地工作，但唯一的问题是Origin的属性Y。

 -(void)MixVideoWithText: (NSURL *)url
  {

AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:url options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
CMTime assetTime = [videoAsset duration];
Float64 duration = CMTimeGetSeconds(assetTime);
duration = duration - 2;
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
//If you need audio as well add the Asset Track for audio here

[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];

[compositionVideoTrack setPreferredTransform:[[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];
CGSize sizeOfVideo = [[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] naturalSize];
//CGSize sizeOfVideo=[videoAsset naturalSize];

//TextLayer defines the text they want to add in Video
//Text of watermark
CATextLayer *textOfvideo=[[CATextLayer alloc] init];
textOfvideo.string=[NSString stringWithFormat:@"%@",@""];//text is shows the text that you want add in video.
//[textOfvideo setFont:(__bridge CFTypeRef)([UIFont fontWithName:[NSString stringWithFormat:@"%@",fontUsed] size:13])];//fontUsed is the name of font
[textOfvideo setFrame:CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height/6)];
[textOfvideo setAlignmentMode:kCAAlignmentCenter];
[textOfvideo setForegroundColor:[[UIColor blackColor] CGColor]];

//Image of watermark
UIImage *myImage=layerImage;
CALayer *layerCa = [CALayer layer];
layerCa.contents = (id)myImage.CGImage;

layerCa.frame = layerImageFrames;
layerCa.opacity = 1.0;
layerCa.contentsGravity = kCAGravityResizeAspect;
CALayer *optionalLayer=[CALayer layer];

optionalLayer.contents = (id)myImage.CGImage;

optionalLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
[optionalLayer setMasksToBounds:YES];
optionalLayer.opacity = 1.0;
optionalLayer.contentsGravity = kCAGravityResizeAspect;



//

// the code for the opacity animation which then removes the text
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[animation setDuration:2]; //duration
[animation setFromValue:[NSNumber numberWithFloat:1.0]];
[animation setToValue:[NSNumber numberWithFloat:0.0]];
[animation setBeginTime:1.5]; // time to show text
[animation setRemovedOnCompletion:NO];
[animation setFillMode:kCAFillModeForwards];
[optionalLayer addAnimation:animation forKey:@"animateOpacity"];
//
CALayer *parentLayer=[CALayer layer];
CALayer *videoLayer=[CALayer layer];
parentLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
videoLayer.frame=CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
[parentLayer addSublayer:videoLayer];

[parentLayer addSublayer:layerCa];

AVMutableVideoComposition *videoComposition=[AVMutableVideoComposition videoComposition] ;
videoComposition.frameDuration=CMTimeMake(1, 30);
videoComposition.renderSize=sizeOfVideo;
videoComposition.animationTool=[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];

AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComposition.instructions = [NSArray arrayWithObject: instruction];

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd_HH-mm-ss"];
NSString *destinationPath = [documentsDirectory stringByAppendingFormat:@"/utput_%@.mov", [dateFormatter stringFromDate:[NSDate date]]];

AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
exportSession.videoComposition=videoComposition;

exportSession.outputURL = [NSURL fileURLWithPath:destinationPath];
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
    self.activityIndicator.hidden = YES;
    self.view.userInteractionEnabled = YES;
    self.blackView.hidden = YES;
    switch (exportSession.status)
    {

        case AVAssetExportSessionStatusCompleted:
            NSLog(@"Export OK");
            if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(destinationPath)) {
                UISaveVideoAtPathToSavedPhotosAlbum(destinationPath, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);

            }
            break;
        case AVAssetExportSessionStatusFailed:

            NSLog (@"AVAssetExportSessionStatusFailed: %@", exportSession.error);
            break;
        case AVAssetExportSessionStatusCancelled:

            NSLog(@"Export Cancelled");
            break;
    }
}];
   }

任何帮助将不胜感激。

将水印添加到视频CLLayer Frame问题

0 个答案: