iOS（GPUImage本地视频叠加） iOS：GPUImage本地视频叠加

之前看过一些视频APP,可以把多个视频嵌入到一个视频图层中,抽空研究了下,思路是使用GPUImage中的GPUImageTwoInputFilter滤镜,这个滤镜可以添加2个渲染轨道。
问题：使用2个GPUImageMovie作为输入源,但是改变外层图层的位置大小是一个问题,后续抽空研究。
【iOS（GPUImage本地视频叠加）】最终的做出的效果图：

Untitled.gif 代码：

- (void)addFilter{ NSURL *path1 = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp4"]]; NSURL *path2 = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"2" ofType:@"mp4"]]; AVAsset* inputAsset1 = [AVAsset assetWithURL:path1]; AVAsset* inputAsset2 = [AVAsset assetWithURL:path2]; NSString *outPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.mp4"]; //输出文件 NSURL* outUrl = [NSURL fileURLWithPath:outPath]; [[NSFileManager defaultManager] removeItemAtPath:outPath error:nil]; //输入源1 GPUImageMovie* imageMovie1 = [[GPUImageMovie alloc] initWithURL:path1]; imageMovie1.shouldRepeat = NO; //循转播放 imageMovie1.playAtActualSpeed = YES; //预览视频时的速度是否要保持真实的速度 imageMovie1.runBenchmark = YES; //打印处理的frame//输入源2 GPUImageMovie* imageMovie2 = [[GPUImageMovie alloc] initWithURL:path2]; imageMovie2.shouldRepeat = NO; //循转播放 imageMovie2.playAtActualSpeed = YES; //预览视频时的速度是否要保持真实的速度 imageMovie2.runBenchmark = YES; //打印处理的frame//输出源 self.movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:outUrl size:[self getVideoOutPutNaturalSizeWithAsset:inputAsset1]]; self.movieWriter.transform = [self getVideoOrientationWithAsset:inputAsset1]; self.movieWriter.encodingLiveVideo = NO; //视频是否循环播放 self.movieWriter.shouldPassthroughAudio = YES; //是否使用源音源// 滤镜 GPUImageDissolveBlendFilter * filter = [[GPUImageDissolveBlendFilteralloc] init]; filter.mix = 0.5; [filter addTarget:self.movieWriter]; [imageMovie1 addTarget:filter]; [imageMovie2 addTarget:filter]; [self.movieWriter startRecording]; [imageMovie1 startProcessing]; [imageMovie2 startProcessing]; __weak typeof(self) weakSelf = self; [self.movieWriter setCompletionBlock:^{ __strong typeof(self) strongSelf = weakSelf; NSLog(@"合并完成"); [filter removeTarget:strongSelf.movieWriter]; [strongSelf.movieWriter finishRecording]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ AVPlayerViewController *playerVc = [[AVPlayerViewController alloc]init]; playerVc.player = [[AVPlayer alloc]initWithURL:outUrl]; [playerVc.player play]; [strongSelf presentViewController:playerVc animated:YES completion:nil]; }); }]; [self.movieWriter setFailureBlock:^(NSError *error) { NSLog(@"合成失败：error = %@",error.description); }]; }//获取视频旋转角度 - (CGAffineTransform)getVideoOrientationWithAsset:(AVAsset*)asset{NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo]; AVAssetTrack *videoTrack = [tracks objectAtIndex:0]; return videoTrack.preferredTransform; } //获取视频分辨率 - (CGSize)getVideoOutPutNaturalSizeWithAsset:(AVAsset*)asset{NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo]; AVAssetTrack *videoTrack = [tracks objectAtIndex:0]; CGFloat width = videoTrack.naturalSize.width; CGFloat height = videoTrack.naturalSize.height; CGSize size = CGSizeZero; CGAffineTransform videoTransform = videoTrack.preferredTransform; //矩阵旋转角度if (videoTransform.a == 0 && videoTransform.b == 1.0 && videoTransform.c == -1.0 && videoTransform.d == 0) { size = CGSizeMake(width, height); } if (videoTransform.a == 0 && videoTransform.b == -1.0 && videoTransform.c == 1.0 && videoTransform.d == 0) { size = CGSizeMake(width, height); } if (videoTransform.a == 1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == 1.0) { size = CGSizeMake(width, height); } if (videoTransform.a == -1.0 && videoTransform.b == 0 && videoTransform.c == 0 && videoTransform.d == -1.0) { size = CGSizeMake(height, width); }return size; }

GitHub：
https://github.com/qw9685/GPUImage-addVideo