v4l2loopback-ctl(1)

control v4l2 loopback devices

Section 1 v4l2loopback-utils bookworm source

Description

v4l2loopback-ctl - control v4l2 loopback devices

utils/v4l2loopback-ctl [command] [args]

set-fps <FPS> /dev/videoX

Set device fps (if format is already negotiated).

set-timeout-image <IMAGE> /dev/videoX

Set timeout on device, and optionally the placeholder picture, instead of default null frame.

set-caps <CAPS> /dev/videoX

Fix format for the device (using GStreamer caps), so it will be maintained until reset, regardless of future readers/writers.

	FPS		frames per second, either as integer (’30’) or fraction (’50/2’)
	IMAGE		image file ("no-input.png"), or ’videotestsrc’
	CAPS		GStreamer caps ("video/x-raw, format=UYVY, width=640, height=480"), or ’any’

/dev/videoX

the v4l2-loopback device file you want to act on