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Follow-the-Presenter Tools for DIY Instructional Videos

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Stop me if you’ve heard this one before, 但是制作diy教育视频最难的部分是“你自己”的部分. “你自己”甚至会让“做”的部分变得更加困难,因为没有队友来帮助你保持动力和按时完成任务. In 2018, I discussed how teaching is a social activity and a live performance. 对着屏幕和网络摄像头表演/教学是一种不自然的行为,很难调整. 而一个优秀的学术视频制作团队应该通过扮演学生的角色来引发自然的一对一教学表现,从而缓解这个问题, 他们还有一项相当平庸的工作,就是让老师在为上课选择的空间里走动时,在镜头中保持正确的画面.

Until fairly recently, 如果一位老师想要制作一个DIY教学视频,不受摄像机前固定点的束缚, 他们需要远程控制平移变焦(PTZ)头或多镜头切换器. 随着功能强大且价格低廉的面部识别软件的出现, 一些消费类视频会议摄像机现在提供自动取景功能,允许教师或其他演示者在场景中移动,以便更好地与观众互动,并与道具和视觉辅助工具进行互动.

Last summer, I reviewed the Owl 3, 通常用于在一个地点捕捉多个会议参与者的摄像机, 但这也提供了一种跟随主讲人的模式,可以在房间里跟随主讲人. One camera that is fairly similar to this use of the Owl 3 is the HuddleCamHD Pro. 它有两种型号,售价约300美元:一种提供HDMI输出和USB接口,用作传统的网络摄像头;另一种提供RJ45插孔,用于NDI工作流和以太网供电. The HuddleCamHD Pro, like the Owl 3, 对于多人演示或者演示者可能展示大型视觉辅助的用例来说,这是理想的吗, such as a projection or a large chalkboard or whiteboard.

和Owl 3一样,HuddleCamHD Pro不会移动来跟踪演示者. 通过4K传感器和108°镜头,它可以在房间内跟踪演示者. 当第二个人开始说话,或者如果场景中出现了演示者正在与之互动的屏幕或板,它可以重新构建. It does these things quite well, 虽然从一帧到另一帧的过渡是相当突然和不和谐的, at least on the firmware version that I’ve tested with. 这台相机非常适合记录小组讨论或研讨会教室, where many people may be speaking and rapidly taking turns doing so.

两款非常相似的电动PTZ相机价格略低于HuddleCamHD Pro OBSBOT Tiny 4K and the Insta360 Link. 这两款相机都提供基于手势的控制,一旦你习惯了,功能就会令人印象深刻. 当你把手举到脸旁边时,主要的手势功能会命令相机锁定你. 两个摄像头都将显示基地上的闪烁灯,表明命令已收到, so after the lights flash, you can put your hand down, and the camera will begin following you.

两种相机都不使用时钟弹簧或类似的机制来允许相机的布线旋转超过360°, 因此,如果演示者绕着它转了一圈,摄像机就无法跟随它(如果应用程序真正需要的话,Owl 3将能够做到这一点)。. 这两款相机都有一个变焦手势,你可以用“手指朝上”的手势来指示. The OBSBOT Tiny offers only two zoom positions, so once the camera receives the gesture command and blinks, 它将放大或缩小到另一个离散缩放位置. Insta360 Link可以在最小和最大缩放位置之间缩放到任何数量, stopping when you remove your gesture. This is a feature that benefits from a confidence monitor.

The Insta360 Link offers a third, very impressive gesture. 如果你把贴纸贴在白板的四个角上,做出v字代表胜利的手势, 摄像头将放大到白板,甚至调整梯形视角,以填充包含在四个贴纸中的内容的框架.

Overall, Insta360 Link是一款比OBSBOT Tiny 4K更好的相机,但价格却相当低. However, if you’re a teacher who simply wants to free yourself from your desk, the 1080p version of the OBSBOT Tiny 4K is an inexpensive solution.

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