如何在RealityKit中录制视频? [英] How to record video in RealityKit?

问题描述

我在Xcode中有一个RealityKit项目，我想记录ARView.我考虑过ReplayKit，但这是用于屏幕录像，我只想记录ARView及其摄像机的提要.我考虑了AFathi的开源项目ARVideoKit，但是它不支持RealityKit ...关于不同渲染路径的一些知识.我找到了一篇中型文章，描述了如何在ARKit应用程序中实现录制功能，但是问题是它需要方法:func renderer(_ renderer: SCNSceneRenderer)在RealityKit中不可用，因为它专门是SceneKit方法.

I have a RealityKit project in Xcode and I want to record the ARView. I considered ReplayKit, but that is for screen recording, I want to record only the ARView with its camera feed. I considered the open source project ARVideoKit by AFathi but that doesn't support RealityKit... something about different rendering paths. I have found a Medium article which describes how to implement a recording feature in an ARKit app, but the problem is that it requires the method: func renderer(_ renderer: SCNSceneRenderer) which is not available in RealityKit because it is specifically a SceneKit method.

推荐答案

我的答案假定您熟悉使用AVAssetWriter录制视频和音频.

My answer assumes you are familiar with recording video and audio using AVAssetWriter.

ARKit session(_:didUpdate:)方法的一部分提供了一个捕获的帧.返回的ARFrame对象具有名为capturedFrame的CVPixelBuffer.像处理常规视频录制会话一样处理帧，除了不是在captureOutput(_:didOutput:from:)方法中捕获，而是在此处捕获.如果您还打算从麦克风录制音频，则可能仍需要captureOutput(_:didOutput:from:)音频方法.

There is a captured frame that is provided as part of the ARKit session(_:didUpdate:) method. The ARFrame object returned has a CVPixelBuffer named capturedFrame. Handle the frame as you would a regular video recording session, except instead of being captured in captureOutput(_:didOutput:from:) method, it is captured here instead. You may still need a captureOutput(_:didOutput:from:) method for audio if you intend on recording audio from the microphone, too.

就我而言，我将捕获的帧转换为MTLTexture，并使用Metal处理视频帧，然后再将其传递到AVAssetWriter.录制之前，我想在相机框架上画图.不幸的是，这样做很复杂，恐怕不是一个简短的复制+粘贴答案.希望将您指向ARKit返回的capturedFrame对象是您开始的好地方.

In my case, I converted my captured frame into a MTLTexture and used Metal to process my video frames before passing them to an AVAssetWriter. I wanted to draw on top of my camera frames before recording. Unfortunately, doing this is very complicated and not a quick and short copy+paste answer I'm afraid. Hopefully pointing you to the capturedFrame object returned by ARKit is a good place for you to start.

有关如何使用AVAssetWriter录制视频的示例: https://programmersought.com/article/80131041234/;jsessionid=38CBA6743FB3C440DE9D2B25A>

Example on how to record videos using AVAssetWriter: https://programmersought.com/article/80131041234/;jsessionid=38CBA6743FB3C440DE9D2B25A6854B28

如果要深入了解OpenGL/金属的兔子洞，请执行以下操作: https://developer.apple.com/documentation/metalkit/

If you want to dive down the rabbit hole of OpenGL/Metal: https://developer.apple.com/documentation/metalkit/

这篇关于如何在RealityKit中录制视频?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！