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GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseTransform ╰── GstVideoFilter ╰── GstSMPTEAlpha
smptealpha can accept an I420 or AYUV video stream. An alpha channel is added using an effect specific SMPTE mask in the I420 input case. In the AYUV case, the alpha channel is modified using the effect specific SMPTE mask.
The “position” property is a controllabe double between 0.0 and 1.0 that specifies the position in the transition. 0.0 is the start of the transition with the alpha channel to complete opaque where 1.0 has the alpha channel set to completely transparent.
The “depth” property defines the precision in bits of the mask. A higher presision will create a mask with smoother gradients in order to avoid banding.
Here is a pipeline to demonstrate the smpte transition :
gst-launch-1.0 -v videotestsrc ! smptealpha border=20000 type=44 position=0.5 ! videomixer ! videoconvert ! ximagesink
This shows a midway bowtie-h transition a from a videotestsrc to a transparent image. The edges of the transition are smoothed with a 20000 big border.
plugin |
smpte |
author |
Wim Taymans <wim.taymans@gmail.com> |
class |
Filter/Editor/Video |
name |
sink |
direction |
sink |
presence |
always |
details |
video/x-raw, format=(string)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
| video/x-raw, format=(string)YV12, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)BGRA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
name |
src |
direction |
source |
presence |
always |
details |
video/x-raw, format=(string)AYUV, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
| video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)BGRA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | |
| video/x-raw, format=(string)ARGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
“border” property“border” gint
The border width of the transition.
Flags: Read / Write
Allowed values: >= 0
Default value: 0
“depth” property“depth” gint
Depth of the mask in bits.
Flags: Read / Write
Allowed values: [1,24]
Default value: 16
“position” property“position” gdouble
Position of the transition effect.
Flags: Read / Write
Allowed values: [0,1]
Default value: 0
“type” property “type” GstSMPTEAlphaTransitionType
The type of transition to use.
Flags: Read / Write
Default value: A bar moves from left to right
“invert” property“invert” gboolean
Set to TRUE to invert the transition mask (ie. flip it horizontally).
Flags: Read / Write
Default value: FALSE