alpha

(from GStreamer Good Plug-ins git)

Adds an alpha channel to video - uniform or via chroma-keying

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBaseTransform
                    ╰──GstVideoFilter
                        ╰──alpha

Factory details

Authors: – Wim Taymans Edward Hervey Jan Schmidt

Classification: – Filter/Effect/Video

Rank – none

Plugin – libgstalpha.so

Package – GStreamer Good Plug-ins git

Pad Templates

`sink`

video/x-raw:
         format: { AYUV, ARGB, BGRA, ABGR, RGBA, Y444, xRGB, BGRx, xBGR, RGBx, RGB, BGR, Y42B, YUY2, YVYU, UYVY, I420, YV12, Y41B }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]

Presence – always

Direction – sink

`src`

video/x-raw:
         format: { AYUV, ARGB, BGRA, ABGR, RGBA, Y444, xRGB, BGRx, xBGR, RGBx, RGB, BGR, Y42B, YUY2, YVYU, UYVY, I420, YV12, Y41B }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]

Presence – always

Direction – src

Properties

alpha

“alpha” gdouble

The value for the alpha channel

Flags : Read / Write

Default value : 1

angle

“angle” gfloat

Size of the colorcube to change

Flags : Read / Write

Default value : 20

black-sensitivity

“black-sensitivity” guint

Sensitivity to dark colors

Flags : Read / Write

Default value : 100

method

“method” Alpha-method

How the alpha channels should be created

Flags : Read / Write

Default value : set (0)

name

“name” gchararray

The name of the object

Flags : Read / Write / Construct

Default value : NULL

noise-level

“noise-level” gfloat

Size of noise radius

Flags : Read / Write

Default value : 2

parent

“parent” GstObject *

The parent of the object

Flags : Read / Write

prefer-passthrough

“prefer-passthrough” gboolean

Don't do any processing for alpha=1.0 if possible

Flags : Read / Write

Default value : false

qos

“qos” gboolean

Handle Quality-of-Service events

Flags : Read / Write

Default value : true

target-b

“target-b” guint

The blue color value for custom RGB chroma keying

Flags : Read / Write

Default value : 0

target-g

“target-g” guint

The green color value for custom RGB chroma keying

Flags : Read / Write

Default value : 255

target-r

“target-r” guint

The red color value for custom RGB chroma keying

Flags : Read / Write

Default value : 0

white-sensitivity

“white-sensitivity” guint

Sensitivity to bright colors

Flags : Read / Write

Default value : 100

Named constants

Alpha-method

Members

set (0) – Set/adjust alpha channel

green (1) – Chroma Key on pure green

blue (2) – Chroma Key on pure blue

custom (3) – Chroma Key on custom RGB values

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