v4l2loopback-ctl - control v4l2 loopback devices
usage: utils/v4l2loopback-ctl [general commands]
- general commands ================
-v/--version : print version and exit
-h/-?/--help : print this help and exit
- add {<flags>} [<outputdevice> [<capturedevice>]]
- delete <device>
- list {<flags>}
- query {<flags>} <device>
- set-fps <device> <fps>
- get-fps <device>
- set-caps <device> <caps>
- get-caps <device>
- set-timeout-image {<flags>} <device> <image>
- adding devices ('add') ======================
- utils/v4l2loopback-ctl add {<flags>} [<outputdevice>
[<capturedevice>]]
- <flags>
- any of the following flags may be present
- -n/--name
<name>
- : pretty name for the device
- --min-width
<w>
- : minimum allowed frame width
- -w/--max-width
<w>
- : maximum allowed frame width
- --min-height
<w>
- : minimum allowed frame height
- -h/--max-height
<h>
- : maximum allowed frame height
-x/--exclusive-caps <x> : whether to announce
OUTPUT/CAPTURE capabilities exclusively
- -b/--buffers
<num>
- : buffers to queue
- -o/--max-openers
<num>
- : maximum allowed concurrent openers
- -v/--verbose
- : verbose mode (print properties of device after successfully creating
it)
- -?/--help
- : print this help and exit
- <outputdevice>
- if given, create a specific device (otherwise just create a free
one).
- either specify a device name (e.g. '/dev/video1') or a device number
('1').
- <capturedevice>
- if given, use separate output & capture devices (otherwise they are
the same).
- deleting devices ('delete') ===========================
- utils/v4l2loopback-ctl delete <device>
- <device>
- can be given one more more times (to delete multiple devices at once).
either specify a device name (e.g. '/dev/video1') or a device number
('1').
- listing devices ('list') ========================
- utils/v4l2loopback-ctl list {<flags>}
- <flags>
- any of the following flags may be present
- -e/--escape
- : escape control-characters in (device) names
- -h/--help
- : print this help and exit
- list all available loopback-devices
- querying devices ('query') ==========================
- utils/v4l2loopback-ctl query {<flags>} <device>
- <flags>
- any of the following flags may be present
- -e/--escape
- : escape control-characters in (device) names
- -h/--help
- : print this help and exit
- <device>
- can be given one more more times (to query multiple devices at once).
either specify a device name (e.g. '/dev/video1') or a device number
('1').
- setting framerate ('set-fps') =============================
- utils/v4l2loopback-ctl set-fps <device> <fps>
- <device>
- either specify a device name (e.g. '/dev/video1') or a device number
('1').
- <fps>
- frames per second, either as integer ('30') or fraction ('50/2').
- getting framerate ('get-fps') =============================
- utils/v4l2loopback-ctl get-fps <device>
- setting capabilities ('set-caps') =================================
- utils/v4l2loopback-ctl set-caps <device> <caps>
- <device>
- either specify a device name (e.g. '/dev/video1') or a device number
('1').
- <caps>
- format specification as
'<fourcc>:<width>x<height>@<fps>' (e.g.
'UYVY:1024x768@60/1') unset the current caps with the special value
'any'
- getting capabilities ('get-caps') =================================
- utils/v4l2loopback-ctl get-caps <device>
- setting timeout image ('set-timeout-image')
===========================================
- utils/v4l2loopback-ctl set-timeout-image {<flags>} <device>
<image>
- <flags>
- any of the following flags may be present
- -t/--timeout
<timeout>
- : timeout (in ms)
- -v/--verbose
- : raise verbosity (print what is being done)
- -h/--help
- : print this help and exit
- <device>
- either specify a device name (e.g. '/dev/video1') or a device number
('1').
- <image>
- image file