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This module allows you to create "virtual video devices" normal (v4l2) applications will read these devices as if they were ordinary video devices, but the video will not be read from e.g. a capture card but instead it is generated by another application.
Use v4l2loopback-ctl for controlling FPS, placeholder image and image format. See "$ man v4l2loopback-ctl.1" or "$ v4l2loopback-ctl --help".