Why am I getting a green screen while previewing an object made using videoinput but it works when previewing an object using webcam function?

I am trying to capture a video from a logitech HD pro webcam C920. When I preview the camera after creating an object called cam, it works prefectly:

cam = webcam(1)
preview(cam)
% image comes up, works as it should

But when I create an object using the 'videoinput' command, previewing that object just returns a green screen:

vobj = videoinput('winvideo', '1')
preview(vobj)
% no image except a green screen with a band of white noise at the top

I am using Matlab 2018a (it is the latest version compatible with some NI devices I am using)

Thank you.

Answer 1

[Anshika Chaurasia]

Hi Kosta,

Refer to following discussion which is related to the similar issues as mentioned by you:

Why do I receive a black preview window with videoinput preview? - MATLAB Answers - MATLAB Central (mathworks.com)