如果您的设备（iPhone、iPad 和Mac）的摄像头无法用于FaceTime通话，本教程包含八个故障排除步骤。如果您在使用Mac的网络摄像头（也称为“ FaceTime 高清(FaceTime HD)摄像头”）时遇到问题，请参阅本文(refer to this article)。
在尝试以下建议之前，请确保没有其他应用正在使用您设备的相机。Mac 的FaceTime 高清(FaceTime HD)摄像头旁边有一个绿色指示灯。当应用程序正在使用相机时，它会亮起。在 iPhone 和 iPad 上，检查状态栏中的绿色指示器——就在(green indicator in the status bar)网络信号栏的正上方。
如果绿色指示灯亮起，请关闭可能正在使用您设备摄像头的应用程序，并检查您设备的摄像头现在是否可以在FaceTime中使用。想想：视频通话应用程序（Zoom、Skype、Teams）、即时通讯程序（WhatsApp、Telegram）、社交媒体应用程序（Facebook、Snapchat、Instagram）、视频录制应用程序，甚至是您的浏览器。重新启动您的设备也可能会解决您的FaceTime摄像头无法正常工作的问题。
1.检查互联网连接
(Video)如果互联网连接缓慢或不稳定，(internet connection is slow or unstable)视频通话应用程序可能无法在视频通话期间传输图像。如果您设备的摄像头在FaceTime(FaceTime)通话期间无法正常工作，请确保您的蜂窝数据或 Wi-Fi 连接正常工作。在浏览器上访问网页或使用其他依赖互联网的应用程序并检查它们是否有效。
如果您使用蜂窝数据，请联系您的互联网服务提供商。对于无线 ( Wi-Fi ) 连接，请将您的设备移近路由器，或重新启动路由器。启用(Enabling)和禁用飞行模式(airplane mode)还可以刷新设备的连接并让FaceTime摄像头再次正常工作。
2.打开FaceTime相机
如果您在 iPhone、iPad 或Mac上进行(Mac)FaceTime通话期间视频拼贴显示黑屏，您可能不小心关闭了FaceTime摄像头。
在 iOS 15 和 iPadOS 15 中，在通话过程中点击屏幕并选择摄像机图标(camcorder icon)，直到 FaceTime 摄像头工作。
在较旧的 iOS 和 iPadOS 版本上，在通话过程中点击屏幕，向上滑动屏幕底部的卡片，然后点击关闭摄像头(Camera Off)以激活 FaceTime 摄像头。
如果摄像头已打开，但FaceTime通话中的磁贴显示黑屏，请启用摄像头关闭(Camera Off)选项并将其关闭。
Mac上的FaceTime客户端还附带一个摄像头开关。如果突出显示打叉的摄像机图标，则表示该通话禁用FaceTime 高清摄像头。(FaceTime HD)
选择图标以重新启用相机，或者如果您的Mac有相机，则轻点触控栏(Touch Bar)上的相机关闭。(Camera Off)
3.重启FaceTime通话
如果FaceTime的摄像头已启用，但其他方仍然看不到您，请结束通话，关闭并重新打开FaceTime，然后重新开始通话。在Mac上，强制退出FaceTime，重新加入通话并检查您的FaceTime摄像头现在是否正常工作。
在 Mac 键盘上按Command + Option + Escape ，在“强制退出应用程序”窗口中选择FaceTime ，然后选择(FaceTime)强制退出(Force Quit)。
4. 尝试其他应用
打开使用设备相机的应用程序并检查它们是否工作。启动相机(Camera)应用程序或第三方视频通话应用程序，例如Zoom和Skype。如果您的相机可以在这些应用程序上运行，那么FaceTime就是问题所在。重新启动设备或重新安装FaceTime可能会解决问题。
请注意，即使在删除FaceTime应用程序后，您仍然可以拨打和接听FaceTime电话。
- 按住FaceTime应用程序图标并选择删除应用程序(Remove App)。
- 在应用程序删除菜单上选择删除应用程序。(Delete App)
- 最后，选择删除(Delete)。
前往App Store 上的 FaceTime 页面，(FaceTime page on the App Store)然后在您的设备上重新安装该应用程序。如果问题仍然存在，请重新启动 iPhone 或 iPad。
5.在屏幕时间设置(Screen Time Settings)中允许相机
(FaceTime)如果屏幕使用时间设置(Screen Time settings)中有摄像头限制，FaceTime（和其他应用程序）将不会从您的Mac接收视频信号。前往屏幕时间(Screen Time)隐私部分，确保您的应用程序被允许使用 Mac 的相机。
- 打开系统偏好设置(System Preferences)并选择屏幕时间(Screen Time)。
- 在侧边栏中选择内容和隐私(Content & Privacy)，前往应用程序(Apps)选项卡并确保选中相机选项。否则，FaceTime摄像头将无法工作。
6.强制退出后台摄像头(Force Quit Background Camera)进程
“VDCAssistant”和“ AppleCameraAssistant ”是在使用 Mac 相机时在后台运行的两个基本系统进程。如果其中任何一项服务出现问题，您在使用 Mac 的相机时可能会遇到困难。使用终端(Terminal)或活动监视器(Activity Monitor)强制退出 VDCAssistant(Force-quit VDCAssistant)和AppleCameraAssistant，并检查是否恢复FaceTime摄像头。
使用活动监视器强制退出 VDCAssistant(Force Quit VDCAssistant Using Activity Monitor)
- 转到Finder > Applications > Utilities并打开Activity Monitor。
- 在搜索框中键入vdcassistant ，选择(vdcassistant)VDCAssistant，然后选择工具栏中的X 图标(X icon)。
- 选择强制退出(Force Quit)以继续。
使用活动监视器强制退出 VDCAssistant 和 AppleCameraAssistant(Force Quit VDCAssistant and AppleCameraAssistant Using Activity Monitor)
macOS 终端(macOS Terminal)是另一个用于杀死后台进程的有用工具。以下是如何使用它来强制关闭Mac上的VDCAssistant。
- 转到Finder > Applications > Utilities并打开Terminal。
- 在控制台中输入或粘贴sudo killall VDCAssistant并按Return。
- 输入 Mac 的密码，然后按Return。
如果您的Mac运行的是 macOS Mojave或更早版本，您还需要强制退出AppleCameraAssist进程（参见步骤 #4）。否则，如果您的Mac上安装了 macOS (Mac)Catalina或更新版本，请跳至第 6 步。
- 将sudo killall AppleCameraAssistant(sudo killall AppleCameraAssistant)粘贴到终端控制台中，然后按Enter。
- 再次按Enter(Enter)输入您的 Mac 密码。
打开FaceTime或其他视频通话应用程序并检查 Mac 的摄像头现在是否可以正常工作。
7. 更新您的设备
iOS、iPadOS 和 macOS 更新通常会针对影响FaceTime和其他系统应用程序的问题进行错误修复。检查您设备的设置菜单并在页面上安装任何可用的更新。
在 iPhone 和 iPad 上，前往“设置”(Settings) > “通用(General)” > “软件更新”(Software Update)，然后轻点“下载并安装(Download and Install)” 。
要更新您的 Mac，请打开系统偏好设置(System Preferences)，选择软件更新(Software Update)，然后选择立即更新(Update Now)（或立即升级(Upgrade Now)）按钮。
8.使用外接摄像头
如果 Mac 的内置FaceTime摄像头无法正常工作，请使用外部网络摄像头（如果有的话）。之后，在(Afterward)FaceTime和其他应用程序中拨打电话时，将网络摄像头配置为主摄像头。
打开 FaceTime，在菜单栏中选择视频，然后在“相机”部分选择外部网络摄像头。(Video)
(Contact Apple Support)如果您设备的摄像头在FaceTime 通话(FaceTime)或其他应用程序中仍然无法正常工作，请联系 Apple 支持或访问附近的Genius Bar 天才吧。(Genius Bar)
FaceTime Camera Not Working? 8 Ways to Fix on iPhone, iPad, and Mac
This tutorial embodiеs eight trоubleshooting steps to follow if your dеvice’s (iPhone, iPаd, and Mac) camera doesn’t work for FaceTime calls. If you’re having trouble with your Mac’s webcam (also called the “FaceTime HD camera”), refer to this article instead.
Before trying the recommendations below, make sure no other app is using your device’s camera. There’s a green indicator that sits next to your Mac’s FaceTime HD camera. It lights up when an app is using the camera. On iPhone and iPad, check for the green indicator in the status bar—right above the network signal bars.
If the green indicator is on, close apps that could be using your device’s camera and check if your device’s camera now works in FaceTime. Think: video-calling apps (Zoom, Skype, Teams), instant messengers (WhatsApp, Telegram), social media apps (Facebook, Snapchat, Instagram), video recording apps, or even your browser. Restarting your device might also fix the issue with your FaceTime camera not working.
1. Check Internet Connection
Video calling apps may not transmit images during video calls if the internet connection is slow or unstable. If your device’s camera doesn’t work during FaceTime calls, make sure your cellular data or Wi-Fi connection is working correctly. Visit a webpage on your browser or use other internet-dependent apps and check if they work.
Contact your internet service provider if you’re using cellular data. For wireless (Wi-Fi) connections, move your device closer to your router, or reboot the router. Enabling and disabling airplane mode can also refresh your device’s connection and get the FaceTime camera working correctly again.
2. Turn on FaceTime Camera
If your video tile is showing a black screen during FaceTime calls on your iPhone, iPad, or Mac, you probably turned off the FaceTime camera by accident.
In iOS 15 and iPadOS 15, tap the screen during the call and select the camcorder icon until the FaceTime camera works.
On older iOS and iPadOS versions, tap the screen during the call, swipe up the card at the bottom of the screen, and tap Camera Off to activate the FaceTime camera.
If the camera is on but your tile in the FaceTime call is showing a black screen, enable the Camera Off option and turn it back off.
The FaceTime client on Mac also comes with a camera switch. If the crossed-out camcorder icon is highlighted, the FaceTime HD camera is disabled for that call.
Select the icon to re-enable the camera, or tap Camera Off on the Touch Bar if your Mac has one.
3. Restart the FaceTime Call
If FaceTime’s camera is enabled but other parties still can’t see you, end the call, close and reopen FaceTime, and restart the call. On Mac, force quit FaceTime, rejoin the call and check if your FaceTime camera now works.
Press Command + Option + Escape on your Mac’s keyboard, select FaceTime in the “Force Quit Applications” window, and select Force Quit.
4. Try Another App
Open apps that use your device’s camera and check if they work. Launch the Camera app or third-party video-calling apps like Zoom and Skype. If your camera works on these apps, then FaceTime is the problem. Restarting your device or reinstalling FaceTime might fix the problem.
Note that you’ll still be able to make and receive FaceTime calls even after deleting the FaceTime app.
- Press and hold the FaceTime app icon and select Remove App.
- Select Delete App on the app removal menu.
- Finally, select Delete.
Head to the FaceTime page on the App Store and reinstall the app on your device. Restart your iPhone or iPad if the problem persists.
5. Allow Camera in Screen Time Settings
FaceTime (and other apps) won’t receive video signals from your Mac if there’s a camera restriction in the Screen Time settings. Head to the Screen Time privacy section and make sure your apps are allowed to use your Mac’s camera.
- Open the System Preferences and select Screen Time.
- Select Content & Privacy in the sidebar, head to the Apps tab and make sure the Camera option is checked. Otherwise, the FaceTime camera won’t work.
6. Force Quit Background Camera Processes
“VDCAssistant” and “AppleCameraAssistant” are two essential system processes that run in the background when your Mac’s camera is in use. You may encounter difficulties using your Mac’s camera if there’s a problem with either of these services. Force-quit VDCAssistant and AppleCameraAssistant using Terminal or Activity Monitor and check if that restores the FaceTime camera.
Force Quit VDCAssistant Using Activity Monitor
- Go to Finder > Applications > Utilities and open Activity Monitor.
- Type vdcassistant in the search box, select VDCAssistant, and select the X icon in the toolbar.
- Select Force Quit to continue.
Force Quit VDCAssistant and AppleCameraAssistant Using Activity Monitor
The macOS Terminal is another useful tool for killing background processes. Here’s how to use it to force close VDCAssistant on your Mac.
- Go to Finder > Applications > Utilities and open Terminal.
- Type or paste sudo killall VDCAssistant in the console and press Return.
- Enter your Mac’s password and press Return.
If your Mac is running macOS Mojave or older, you’ll also need to force quit the AppleCameraAssist process (see step #4). Otherwise, jump to step #6 if you have macOS Catalina or newer installed on your Mac.
- Paste sudo killall AppleCameraAssistant in the Terminal console and press Enter.
- Enter your Mac’s password again press Enter.
Open FaceTime or other video-calling apps and check if your Mac’s camera now works.
7. Update Your Device
iOS, iPadOS, and macOS updates often ship with bug fixes for issues affecting FaceTime and other system apps. Check your device’s settings menu and install any available update on the page.
On iPhone and iPad, go to Settings > General > Software Update and tap Download and Install.
To update your Mac, open System Preferences, select Software Update, and select the Update Now (or Upgrade Now) button.
8. Use an External Camera
If your Mac’s built-in FaceTime camera isn’t working, use an external webcam if you have one. Afterward, configure the webcam as the primary camera when making calls in FaceTime and other apps.
Open FaceTime, select Video in the menu bar and select the external webcam in the “Camera” section.
Contact Apple Support or visit a nearby Genius Bar if your device’s camera still isn’t working in FaceTime or other apps.
