mirror of
https://github.com/matthew1000/gstreamer-cheat-sheet.git
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49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
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#!/usr/bin/env python
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'''
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An example of how dynamic values can work for properties such as size and position.
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Here an image moves across (in the first second) and then enlarges (in seconds 1-3).
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'''
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import gi
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gi.require_version('Gst', '1.0')
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gi.require_version('GstController', '1.0')
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from gi.repository import GObject, Gst, GstController
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import os
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from time import sleep
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from threading import Thread
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def get_timing_controller(pad, field):
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cs = GstController.InterpolationControlSource()
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cs.set_property('mode', GstController.InterpolationMode.LINEAR)
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cb = GstController.DirectControlBinding.new_absolute(pad, field, cs)
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pad.add_control_binding(cb)
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return cs
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Gst.init(None)
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mainloop = GObject.MainLoop()
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pipe = Gst.parse_launch(\
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"videotestsrc pattern=4 ! "
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"timeoverlay valignment=top font-desc=\"Sans, 50\" ! "
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"compositor name=compositor sink_1::width=80 sink_1::height=45 sink_1::ypos=50 ! autovideosink"
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" videotestsrc pattern=5 ! compositor.")
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compositor = pipe.get_by_name('compositor')
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textoverlay = pipe.get_by_name('textoverlay')
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sink1 = compositor.get_static_pad('sink_1')
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xpos_cs = get_timing_controller(sink1, 'xpos')
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xpos_cs.set(0*Gst.SECOND, 150)
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xpos_cs.set(1*Gst.SECOND, 50)
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width_cs = get_timing_controller(sink1, 'width')
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width_cs.set(1*Gst.SECOND, 80)
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width_cs.set(3*Gst.SECOND, 160)
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height_cs = get_timing_controller(sink1, 'height')
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height_cs.set(1*Gst.SECOND, 45)
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height_cs.set(3*Gst.SECOND, 90)
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pipe.set_state(Gst.State.PLAYING)
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mainloop.run()
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