smpte

smpte — Apply the standard SMPTE transitions on video images

Properties

gint border Read / Write
gint depth Read / Write
gfloat fps Read / Write
GstSMPTETransitionType type Read / Write
guint64 duration Read / Write
gboolean invert Read / Write

Types and Values

struct GstSMPTE

Object Hierarchy

    GObject
    ╰── GstObject
        ╰── GstElement
            ╰── GstSMPTE

Description

smpte can accept I420 video streams with the same width, height and framerate. The two incomming buffers are blended together using an effect specific alpha mask.

The “depth” property defines the presision in bits of the mask. A higher presision will create a mask with smoother gradients in order to avoid banding.

Sample pipelines

gst-launch -v videotestsrc pattern=1 ! smpte name=s border=20000 type=234 duration=2000000000 ! ffmpegcolorspace ! ximagesink videotestsrc ! s.
A pipeline to demonstrate the smpte transition. It shows a pinwheel transition a from a snow videotestsrc to an smpte pattern videotestsrc. The transition will take 2 seconds to complete. The edges of the transition are smoothed with a 20000 big border.

Synopsis

Element Information

plugin

 smpte

author

 Wim Taymans <wim.taymans@chello.be>

class

 Filter/Editor/Video

Element Pads

name

 sink1

direction

 sink

presence

 always

details

 video/x-raw-yuv, format=(fourcc)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

name

 sink2

direction

 sink

presence

 always

details

 video/x-raw-yuv, format=(fourcc)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

name

 src

direction

 source

presence

 always

details

 video/x-raw-yuv, format=(fourcc)I420, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

Functions

Types and Values

struct GstSMPTE

struct GstSMPTE;

Property Details

The “border” property

  “border”                   gint

The border width of the transition.

Flags: Read / Write

Allowed values: >= 0

Default value: 0

The “depth” property

  “depth”                    gint

Depth of the mask in bits.

Flags: Read / Write

Allowed values: [1,24]

Default value: 16

The “fps” property

  “fps”                      gfloat

Frames per second if no input files are given (deprecated).

Flags: Read / Write

Allowed values: >= 0

Default value: 0

The “type” property

  “type”                     GstSMPTETransitionType

The type of transition to use.

Flags: Read / Write

Default value: A bar moves from left to right

The “duration” property

  “duration”                 guint64

Duration of the transition effect in nanoseconds.

Flags: Read / Write

Default value: 1000000000

The “invert” property

  “invert”                   gboolean

Invert transition mask.

Flags: Read / Write

Default value: FALSE

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