iOS视频添加水印两种方式（不用到第三方框架）

1、视频加水印，并保存到沙盒当中

//原视频sureasset，有外界传进来

AVURLAsset *asset = (AVURLAsset *)[self addPhotoTitleWithAsset:sureasset][0];

    AVMutableVideoComposition *mainCompositionInst = [self addPhotoTitleWithAsset:sureasset][1];

    sureasset = asset;

    AVAssetExportSession *session = [[AVAssetExportSession alloc] initWithAsset: sureasset presetName:AVAssetExportPresetMediumQuality];

    NSString *failPath = [self getVideosPath:@"localVideo"];//获取路径

    NSURL *filUrl = [NSURL fileURLWithPath:failPath];

    session.outputURL = filUrl;//视频输出地址

    session.outputFileType = AVFileTypeMPEG4;//AVFileTypeQuickTimeMovie;//AVFileTypeMPEG4;

    // 这个一般设置为yes（指示输出文件应针对网络使用进行优化，例如QuickTime电影文件应支持“快速启动”）

    session.shouldOptimizeForNetworkUse = YES;

    // 文件的最大多大的设置

    session.fileLengthLimit = 30 * 1024 * 1024;

    session.shouldOptimizeForNetworkUse = YES;

    session.videoComposition = mainCompositionInst;

    [session exportAsynchronouslyWithCompletionHandler:^(void){

        dispatch_async(dispatch_get_main_queue(), ^{

            //视频导入成功

            //failPath为本地视频地址

            completeBlock(failPath,YES);

        });

    }];

//获取路径

- (NSString *)getVideosPath:(NSString *)videoName{

    NSString *documents = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];

    documents = [documents stringByAppendingPathComponent:@"CCTV5"];

    documents = [self action_addFiles:documents];//判断文件是否存在

    NSString *failPath = [documents stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4",videoName]];

    return failPath;

}

#pragma mark- 视频加水印

//添加水印

-(NSArray *)addPhotoTitleWithAsset:(AVAsset *)videoAsset

{

    //1 创建AVAsset实例

    //AVURLAsset*videoAsset = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:path]];

    AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init];

    //3 视频通道

    AVMutableCompositionTrack *videoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo

                                                                        preferredTrackID:kCMPersistentTrackID_Invalid];

    [videoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)

                        ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] firstObject]

                        atTime:kCMTimeZero error:nil];

    //2 音频通道

    AVMutableCompositionTrack *audioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio

                                                                        preferredTrackID:kCMPersistentTrackID_Invalid];

    [audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)

                        ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeAudio] firstObject]

                        atTime:kCMTimeZero error:nil];

    //3.1 AVMutableVideoCompositionInstruction 视频轨道中的一个视频，可以缩放、旋转等

    AVMutableVideoCompositionInstruction *mainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];

    mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);

    // 3.2 AVMutableVideoCompositionLayerInstruction 一个视频轨道，包含了这个轨道上的所有视频素材

    AVMutableVideoCompositionLayerInstruction *videolayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];

    [videolayerInstruction setOpacity:0.0 atTime:videoAsset.duration];

    // 3.3 - Add instructions

    mainInstruction.layerInstructions = [NSArray arrayWithObjects:videolayerInstruction,nil];

    //AVMutableVideoComposition：管理所有视频轨道，水印添加就在这上面

    AVMutableVideoComposition *mainCompositionInst = [AVMutableVideoComposition videoComposition];

    AVAssetTrack *videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] firstObject];

    CGSize naturalSize = videoAssetTrack.naturalSize;

    //防崩溃处理，这个width可能为空，按比例给他值

    if (naturalSize.width == 0) {

        CGFloat a = (1280.f / 720);

        naturalSize.width =  a * naturalSize.height;

    }

    float renderWidth, renderHeight;

    renderWidth = naturalSize.width;

    renderHeight = naturalSize.height;

    mainCompositionInst.renderSize = CGSizeMake(renderWidth, renderHeight);

    mainCompositionInst.instructions = [NSArray arrayWithObject:mainInstruction];

    mainCompositionInst.frameDuration = CMTimeMake(1, 30);

    [self applyVideoEffectsToComposition:mainCompositionInst size:naturalSize];

    NSArray *arrar = [NSArray arrayWithObjects:mixComposition,mainCompositionInst, nil];

    return arrar;;

}

/**

设置水印及其对应视频的位置

@param composition 视频的结构

@param size 视频的尺寸

*/

- (void)applyVideoEffectsToComposition:(AVMutableVideoComposition *)composition size:(CGSize)size

{

    // 文字

    CATextLayer *subtitle1Text = [[CATextLayer alloc] init];

    //    [subtitle1Text setFont:@"Helvetica-Bold"];

    [subtitle1Text setFontSize:36];

    [subtitle1Text setFrame:CGRectMake(10, size.height-10-230, size.width, 100)];

    [subtitle1Text setString:@"央视体育5 水印"];

    //    [subtitle1Text setAlignmentMode:kCAAlignmentCenter];

    [subtitle1Text setForegroundColor:[[UIColor whiteColor] CGColor]];

    //图片

    CALayer*picLayer = [CALayer layer];

    //picLayer.contents = (id)[UIImage imageNamed:@"CTVITTRIMSource.bundle/QQ"].CGImage; //本地图片

    picLayer.contents = (id)self.videoWaterMarkImage.CGImage; //本地图片2

    //NSString *imageUrl = @"http://p1.img.cctvpic.com/photoAlbum/templet/special/PAGEQ1KSin2j2U5FERGWHp1h160415/ELMTnGlKHUJZi7lz19PEnqhM160415_1460715755.png";

    //picLayer.contents = (id)[self getImageFromURL:imageUrl].CGImage; //远程图片

    CGFloat width = 63;

    CGFloat leftMargin = 16 * [self scaleSizeWithHeight:size.height];

    CGFloat topMargin = 20 * [self scaleSizeWithHeight:size.height];

    if (self.videoWaterMarkPlace == WaterMarkTopLeft) {

        picLayer.frame = CGRectMake(leftMargin, size.height-topMargin-[self scaleSizeWithHeight:size.height]*50, [self scaleSizeWithHeight:size.height]*width, [self scaleSizeWithHeight:size.height]*width);

    }

    if (self.videoWaterMarkPlace == WaterMarkBottomLeft) {

        picLayer.frame = CGRectMake(leftMargin, 20, [self scaleSizeWithHeight:size.height]*50, [self scaleSizeWithHeight:size.height]*50);

    }

    if (self.videoWaterMarkPlace == WaterMarkTopRight) {

        picLayer.frame = CGRectMake(size.width - 20 - [self scaleSizeWithHeight:size.height]*50, size.height-20-[self scaleSizeWithHeight:size.height]*50, [self scaleSizeWithHeight:size.height]*50, [self scaleSizeWithHeight:size.height]*50);

    }

    if (self.videoWaterMarkPlace == WaterMarkBottomRight) {

        picLayer.frame = CGRectMake(size.width - 20 - [self scaleSizeWithHeight:size.height]*50, 20, [self scaleSizeWithHeight:size.height]*50, [self scaleSizeWithHeight:size.height]*50);

    }

    // 2 - The usual overlay

    CALayer *overlayLayer = [CALayer layer];

    [overlayLayer addSublayer:picLayer];

    //    [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];

}

//ios 从网络上获取图片

-(UIImage *) getImageFromURL:(NSString *)fileURL {

    //https://vod.cctv.cn/cctvsports/cctv5/img/advertisingImage.jpg

    NSLog(@"执行图片下载函数");

    UIImage * result;

    NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]];

    result = [UIImage imageWithData:data];

    return result;

}

2、另一种实现方式

    //    [self applyVideoEffectsToComposition:mainCompositionInst size:naturalSize];

    CIFilter *watermarkFilter = [CIFilter filterWithName:@"CISourceOverCompositing"];

    mainCompositionInst = [AVMutableVideoComposition videoCompositionWithAsset:videoAsset applyingCIFiltersWithHandler:^(AVAsynchronousCIImageFilteringRequest * _Nonnull request) {

        CIImage *watermarkImage  =  [[CIImage alloc] initWithCGImage:self.videoWaterMarkImage.CGImage];

        CIImage *source = request.sourceImage;

        [watermarkFilter setValue:source forKey:kCIInputBackgroundImageKey];

        [watermarkFilter setValue:[watermarkImage imageByApplyingTransform:CGAffineTransformMakeScale(0.5, 0.5)] forKey:kCIInputImageKey];

        [watermarkFilter setValue:[watermarkImage imageByApplyingTransform:CGAffineTransformMakeTranslation(14, source.extent.size.height - 14 - watermarkImage.extent.size.height)] forKey:kCIInputImageKey];

        [request finishWithImage:watermarkFilter.outputImage context:nil];

    }];

    //      //    // 4 - 输出路径