camera

This is a demo program that reads images from a camera and displays them on an LCD screen.
/dev/video0 -> /dev/fb1

In Debian, you can use ffmpeg to display the content from a camera directly onto an LCD screen.

apt install ffmpeg
ffmpeg -f video4linux2 -i /dev/video0 -pix_fmt rgb565le -vf "scale=320:240" -f fbdev /dev/fb1

ffmpeg: This is the command-line tool used for handling multimedia data.
-f video4linux2: This option specifies the input format as video4linux2, which is a standard interface for video capture devices in Linux.
-i /dev/video0: This option sets the input device, where /dev/video0 is the default device file for the first video capture device (e.g., a webcam) on a Linux system.
-pix_fmt rgb565le: This option sets the pixel format to rgb565le, which stands for RGB with 5 bits for red, 6 bits for green, and 5 bits for blue, in little-endian format.
-vf scale=320:240: This is a video filter command that scales the video to a resolution of 320x240 pixels.
-f fbdev: This option sets the output format to fbdev, which is the framebuffer device.
/dev/fb1: This is the output device, where /dev/fb1 is the device file for the second framebuffer on a Linux system. The video will be displayed on this framebuffer.