Need help setting the video codec to H.264 when using an AVCaptureMovieFileOutput instance.
Looking at the Apple Docs I see that they support a struct of type AVVideoCodecType, however, I'm not seeing this in the Xamarin.iOS Docs.
Help would be much appreciated as I don't want to have to rewrite the Video Capture logic to use AVAssetWriter.
所以，我找到了解决方案，这里是为那些追随我的人准备的。
第 1 步：创建一个 AVCaptureMovieFileOutput 实例。
var output = new AVCaptureMovieFileOutput();
第 2 步：创建一个 NSDictionary，在其中列出所需的电影输出设置的键和值。
var outputSettings = new NSDictionary(AVVideoCodecType.H264, AVVideo.CodecKey);
第 3 步：设置输出设置
output.SetOutputSettings(outputSettings, output.ConnectionFromMediaType(AVMediaType.Video))
这里的技巧是调用 ConnectionFromMediaType 方法，传入 AVCaptureMovieFileOutput 实例上的 MediaType，该实例返回一个 AVCaptureConnection。
我必须执行以下操作才能使其在 Xamarin.iOS 中工作：
var videoOutput = new AVCaptureMovieFileOutput();
var outputSettings = new NSDictionary(AVVideo.CodecKey, AVVideo.CodecH264);
videoOutput.SetOutputSettings(outputSettings, videoOutput.Connections[0]);