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Showing content from https://gstreamer.freedesktop.org/documentation/opengl/gloverlay.html below:

gloverlay

Overlay GL video texture with a JPEG/PNG image

Authors: – Filippo Argiolas , Matthew Waters

Classification: – Filter/Effect/Video

Rank – none

Plugin – opengl

Package – GStreamer Base Plug-ins

video/x-raw(ANY):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

video/x-raw(memory:GLMemory):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

Presence – always

Direction – sink

Object type – GstPad

video/x-raw(memory:GLMemory):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

video/x-raw(ANY):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

Presence – always

Direction – src

Object type – GstPad

“alpha” gdouble

Global alpha of overlay image

Flags : Read / Write

Default value : 1

“location” gchararray

Location of image file to overlay

Flags : Read / Write

Default value : NULL

“offset-x” gint

For positive value, horizontal offset of overlay image in pixels from left of video image. For negative value, horizontal offset of overlay image in pixels from right of video image

Flags : Read / Write

Default value : 0

“offset-y” gint

For positive value, vertical offset of overlay image in pixels from top of video image. For negative value, vertical offset of overlay image in pixels from bottom of video image

Flags : Read / Write

Default value : 0

“overlay-height” gint

Height of overlay image in pixels (0 = same as overlay image)

Flags : Read / Write

Default value : 0

“overlay-width” gint

Width of overlay image in pixels (0 = same as overlay image)

Flags : Read / Write

Default value : 0

“relative-x” gdouble

Horizontal offset of overlay image in fractions of video image width, from top-left corner of video image

Flags : Read / Write

Default value : 0

“relative-y” gdouble

Vertical offset of overlay image in fractions of video image height, from top-left corner of video image

Flags : Read / Write

Default value : 0

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