Хочу вещать часть своего экрана, нашёл для этого подходящий метод:
<!--
ScreencastArea:
@x: the X coordinate of the area to capture
@y: the Y coordinate of the area to capture
@width: the width of the area to capture
@height: the height of the area to capture
@file_template: the template for the filename to use
@options: a dictionary of optional parameters
@success: whether the screencast was started successfully
@filename_used: the file where the screencast is being saved
Records a screencast of the passed in area and saves it
(by default) as webm video under a filename derived from
@file_template. The template is either a relative or absolute
filename which may contain some escape sequences - %d and %t
will be replaced by the start date and time of the recording.
If a relative name is used, the screencast will be saved in the
$XDG_VIDEOS_DIR if it exists, or the home directory otherwise.
The actual filename of the saved video is returned in @filename_used.
The set of optional parameters in @options currently consists of:
'draw-cursor'(b): whether the cursor should be included in the
recording (true)
'framerate'(i): the number of frames per second that should be
recorded if possible (30)
'pipeline'(s): the GStreamer pipeline used to encode recordings
in gst-launch format; if not specified, the
recorder will produce vp8 (webm) video (unset)
-->
<method name="ScreencastArea">
<arg type="i" direction="in" name="x"/>
<arg type="i" direction="in" name="y"/>
<arg type="i" direction="in" name="width"/>
<arg type="i" direction="in" name="height"/>
<arg type="s" direction="in" name="file_template"/>
<arg type="a{sv}" direction="in" name="options"/>
<arg type="b" direction="out" name="success"/>
<arg type="s" direction="out" name="filename_used"/>
</method>
