ffmpeg does not stream the webcam feed to a app window

[ruairi-wmf]

When I start ffmpeg, I don't see a window of the webcam display. Although the green light goes on to say the webcam is on.

Then the console starts by see black and responses with content like this:

 The image displays a dark background with a deep black color dominating the scene. In this stark environment, there is a single white dot that stands out prominently, serving as the focal point of the composition. Surrounding the white dot, there are nine smaller dots arranged in various positions throughout the space, collectively creating an intriguing visual contrast against the dark backdrop.JSONDecodeError: Expecting property name enclosed in double quotes
 The image features a dark night sky with no visible objects or people. It is a deep black background that creates a sense of emptiness and vacuum-like void. This blackness encompasses the entire frame of the picture, leaving room for only the subtest to provide any contrast or visual interest

Any suggestions on why ffmpeg is not streaming the webcam?