📷 摄像头测试（在线检测）Webcam Test

使用说明与常见问题How-to & FAQ

「摄像头测试（在线检测）」是什么？What is the Webcam Test tool?

在线检测电脑或手机摄像头和麦克风是否正常：一键打开实时画面，显示实际分辨率、实测帧率、设备支持的最大分辨率和宽高比，可切换多个摄像头、测试 4K、查看麦克风音量电平、镜像显示并拍照保存。Check that your webcam and microphone work: open a live preview in one click and see the actual resolution, measured frame rate, the maximum resolution the device reports and the aspect ratio. Switch between cameras, test 4K, watch the microphone level meter, mirror the view and save a snapshot.

如何使用「摄像头测试（在线检测）」？How do I use the Webcam Test tool?

在「摄像头测试（在线检测）」中，按需设置「摄像头」、「麦克风」等选项，然后点击「打开摄像头」、「测试最高分辨率」、「拍照」、「关闭」按钮即可。In the Webcam Test: Set "Camera", "Microphone", then click "Start camera", "Test max resolution", "Snapshot", "Stop".

摄像头打不开怎么办？What if the camera won't start?

① 点击地址栏左侧的锁形图标，把“摄像头”“麦克风”设为允许后刷新；② 关闭正在使用摄像头的程序（腾讯会议、Zoom、微信视频等）；③ Windows 在“设置 → 隐私 → 相机”中允许桌面应用访问相机，macOS 在“系统设置 → 隐私与安全性 → 摄像头”中勾选浏览器；④ 外接摄像头可换一个 USB 接口。工具会根据错误类型给出提示。1) Click the lock icon left of the address bar, allow Camera and Microphone, then refresh; 2) close apps that are using the camera (Zoom, Teams, WeChat video, etc.); 3) on Windows allow camera access under Settings → Privacy → Camera, on macOS tick your browser under System Settings → Privacy & Security → Camera; 4) try another USB port for external webcams. The tool explains the specific error it gets.

“实测帧率”和“最大分辨率”是怎么得到的？How are measured frame rate and max resolution determined?

实测帧率是统计浏览器每秒实际收到的画面数，光线较暗时很多摄像头会自动降帧。“最大分辨率”是设备向浏览器报告的能力；点击“测试最高分辨率”会请求 4K，看到的“实际分辨率”就是摄像头在浏览器中能输出的最高画质。Measured frame rate counts the frames the browser actually receives per second — many webcams lower it automatically in dim light. Max resolution is what the device reports to the browser; "Test max resolution" requests 4K, and the actual resolution you then see is the best the camera delivers in the browser.

画面为什么是左右颠倒的？Why is the picture mirrored?

默认开启“镜像”，就像照镜子一样更自然，视频会议中对方看到的通常是不镜像的画面。取消勾选即可查看真实方向，拍照保存时也会按当前设置输出。Mirror is on by default because it feels natural, like a mirror; people on a video call usually see the un-mirrored image. Untick it to see the true orientation — snapshots follow the current setting.

画面会被录制或上传吗？Is the video recorded or uploaded?

不会。画面只在本页显示，不录制、不上传；点击“关闭”或离开页面后摄像头会立即释放。No. The picture is only shown on this page, never recorded or uploaded; the camera is released as soon as you press Stop or leave the page.

「摄像头测试（在线检测）」免费吗？需要注册吗？Is the Webcam Test free? Do I need an account?

「摄像头测试（在线检测）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Webcam Test is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.