This simple Gstreamer app fails using the python API
import pgi
pgi.require_version('Gst', '1.0')
from pgi.repository import Gst, GLib
import traceback
Gst.init([])
pipeline = Gst.Pipeline()
src = Gst.ElementFactory.make('videotestsrc', 'src')
sink = Gst.ElementFactory.make('autovideosink', 'sink')
pipeline.add(src)
pipeline.add(sink)
src.link(sink)
src.set_property("pattern", 0)
pipeline.set_state(Gst.State.PLAYING)
with
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
~/Documents/mythic-projects/OKR_2019Q2/gstreamer_pipeline.py in <module>
12 pipeline.add(sink)
13 src.link(sink)
---> 14 src.set_property("pattern", 0)
15
16 pipeline.set_state(Gst.State.PLAYING)
~/Documents/mythic-projects/OKR_2019Q2/venv/lib/python3.6/site-packages/pgi/obj.py in set_property(self, name, value)
73
74 if not hasattr(self.props, name):
---> 75 raise TypeError("Unknown property: %r" % name)
76 setattr(self.props, name, value)
77
TypeError: Unknown property: 'pattern'
I can confirm the command line operation works fine:
gst-launch-1.0 videotestsrc pattern=snow ! autovideosink
But the API seems to be different from the documentation and tutorials. This is true for any .set_property() operation.
e.g. http://lifestyletransfer.com/how-to-launch-gstreamer-pipeline-in-python/
I'm running on Mac OSX, python3.6, and I installed gstreamer as outlined by here: Installing Gstreamer-1.0 on Mac OS X Mavericks (I also tried installing from the .dmg, but the results are the same)
