uvcdynctrl:tldr:4590d

The command "uvcdynctrl -L ${filename}" is used to list the controls and settings supported by a specific video device accessed through the UVC (USB Video Class) driver.

Here's a breakdown of the command:

• "uvcdynctrl": This is the name of the command-line tool for managing UVC video devices. It allows you to control and configure various settings of USB webcams, like brightness, contrast, focus, etc.
• "-L": This option stands for "List", and it is used to display a list of the controls supported by the specified video device. These controls can include properties like brightness, contrast, hue, white balance, exposure, etc.
• "${filename}": This is a placeholder for the filename of the video device you want to list controls for. You need to replace "${filename}" with the actual name of the video device you want to query. Usually, it will be something like "/dev/video0" or "/dev/video1", depending on the number of video devices connected to your system.

By running this command, you can see the specific controls and settings that are available for adjustment on your USB webcam or video device.