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Semantic MediaWiki
There are 1 incomplete or pending task to finish installation of Semantic MediaWiki. An administrator or user with sufficient rights can complete it. This should be done before adding new data to avoid inconsistencies.1. Overview[edit source]
media-ctl is a V4L2 utility[1] used to set up and configure the camera subsystem subdevices. It is based on the media controller Linux kernel interface[2].
2. Usage[edit source]
media-ctl --help
media-ctl [options]
-d, --device dev Media device name (default: /dev/media0)
If <dev> starts with a digit, then /dev/media<dev> is used.
If <dev> doesn't exist, then find a media device that
reports a bus info string equal to <dev>.
-e, --entity name Print the device name associated with the given entity
-V, --set-v4l2 v4l2 Comma-separated list of formats to setup
--get-v4l2 pad Print the active format on a given pad
--get-dv pad Print detected and current DV timings on a given pad
--set-dv pad Configure DV timings on a given pad
-h, --help Show verbose help and exit
-i, --interactive Modify links interactively
-l, --links links Comma-separated list of link descriptors to setup
--known-mbus-fmts List known media bus formats and their numeric values
-p, --print-topology Print the device topology. If an entity
is specified through the -e option, print
information for that entity only.
--print-dot Print the device topology as a dot graph
-r, --reset Reset all links to inactive
-v, --verbose Be verbose
Links and formats are defined as
links = link { ',' link } ;
link = pad '->' pad '[' flags ']' ;
pad = entity ':' pad-number ;
entity = entity-number | ( '"' entity-name '"' ) ;
v4l2 = pad '[' v4l2-properties ']' ;
v4l2-properties = v4l2-property { ',' v4l2-property } ;
v4l2-property = v4l2-mbusfmt | v4l2-crop | v4l2-interval
| v4l2-compose | v4l2-interval ;
v4l2-mbusfmt = 'fmt:' fcc '/' size ; { 'field:' v4l2-field ; } { 'colorspace:' v4l2-colorspace ; }
{ 'xfer:' v4l2-xfer-func ; } { 'ycbcr-enc:' v4l2-ycbcr-enc-func ; }
{ 'quantization:' v4l2-quant ; }
v4l2-crop = 'crop:' rectangle ;
v4l2-compose = 'compose:' rectangle ;
v4l2-interval = '@' numerator '/' denominator ;
rectangle = '(' left ',' top, ')' '/' size ;
size = width 'x' height ;
where the fields are
entity-number Entity numeric identifier
entity-name Entity name (string)
pad-number Pad numeric identifier
flags Link flags (0: inactive, 1: active)
fcc Format FourCC
width Image width in pixels
height Image height in pixels
numerator Frame interval numerator
denominator Frame interval denominator
v4l2-field One of the following:
any
none
top
bottom
interlaced
seq-tb
seq-bt
alternate
interlaced-tb
interlaced-bt
v4l2-colorspace One of the following:
default
smpte170m
smpte240m
rec709
unknown
470m
470bg
jpeg
srgb
oprgb
bt2020
raw
dcip3
v4l2-xfer-func One of the following:
default
709
srgb
oprgb
smpte240m
none
dcip3
smpte2084
v4l2-quant One of the following:
default
full-range
lim-range
3. Examples[edit source]
Refer to V4L2 camera subsystem setup for examples of usage.
4. References[edit source]