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
