Tag: avmutablecomposition

AVFoundation + AssetWriter：通过图像和audio生成电影

我必须从我的iPhone应用程序包含UIImage从NSArray中导出电影，并添加一些.caf格式的audio文件，必须在预先指定的时间开始。 现在我已经能够使用AVAssetWriter（经过这个和其他网站上的许多问题和答案）导出包含图像的video部分，但似乎找不到一种方法来添加audio文件来完成电影。 这是我迄今得到的 -(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size { NSLog(@"Write Started"); NSError *error = nil; AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: [NSURL fileURLWithPath:path] fileType:AVFileTypeQuickTimeMovie error:&error]; NSParameterAssert(videoWriter); NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:size.width], AVVideoWidthKey, [NSNumber numberWithInt:size.height], AVVideoHeightKey, nil]; AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:nil]; NSParameterAssert(videoWriterInput); […]