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Showing content from https://gstreamer.freedesktop.org/documentation/pango/textrender.html below:

textrender

This plugin renders text received on the text sink pad to a video buffer (retaining the alpha channel), so it can later be overlayed on top of video streams using other elements.

The text can contain newline characters. (FIXME: What about text wrapping? It does not make sense in this context)

 gst-launch-1.0 -v filesrc location=subtitles.srt ! subparse ! textrender ! videoconvert ! autovideosink

Authors: – David Schleef , GStreamer maintainers

Classification: – Filter/Editor/Video

Rank – none

Plugin – pango

Package – GStreamer Base Plug-ins

text/x-raw:
         format: { pango-markup, utf8 }

Presence – always

Direction – sink

Object type – GstPad

video/x-raw:
         format: { AYUV, ARGB }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]

Presence – always

Direction – src

Object type – GstPad

“font-desc” gchararray

Pango font description of font to be used for rendering. See documentation of pango_font_description_from_string for syntax.

Flags : Read / Write

“halignment” Text-render-halign *

Horizontal alignment of the text

Flags : Read / Write

Default value : center (1)

“line-alignment” Text-render-line-align *

Alignment of text lines relative to each other.

Flags : Read / Write

Default value : center (1)

“valignment” Text-render-valign *

Vertical alignment of the text

Flags : Read / Write

Default value : baseline (0)

“xpad” gint

Horizontal paddding when using left/right alignment

Flags : Read / Write

Default value : 25

“ypad” gint

Vertical padding when using top/bottom alignment

Flags : Read / Write

Default value : 25

Horizontal alignment of the text.

left (0) – left

center (1) – center

right (2) – right

Alignment of text lines relative to each other

left (0) – left

center (1) – center

right (2) – right

Vertical alignment of the text.

baseline (0) – baseline

bottom (1) – bottom

top (2) – top

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