Gstreamer plugin how to call parent method

Question

I am working on a GStreamer pipeline using Python API. I need to create a plugin to drop video frames when the pipeline is not capable to consuming them fast enough. It is my understanding that I could use a leaky queue, but so far nobody has been able to help with it, therefore I am trying to create a new plugin using Python. First of all, I would like to override do_src_event to register the timestamp of the src_event and subsequently call the parent method do_src_event to perform the src_event. However, this does not seem to work:

TypeError: GstBase.BaseTransform.src_event() takes exactly 2 arguments (1 given)

Code:

import gi
gi.require_version('Gst', '1.0')
gi.require_version('GstBase', '1.0')
gi.require_version('GstVideo', '1.0')

from gi.repository import Gst, GObject, GLib, GstBase, GstVideo  # noqa:F401,F402

from gstreamer.utils import gst_buffer_with_caps_to_ndarray


Gst.init(None)


class GstDropFrames(GstBase.BaseTransform):

    GST_PLUGIN_NAME = 'gstdropframes'

    __gstmetadata__ = (
        "GstDropFrames",
        "Filter/Effect/Video",
        "Description",
        "Author"
    )

    __gsttemplates__ = (
        Gst.PadTemplate.new(
            "src",
            Gst.PadDirection.SRC,
            Gst.PadPresence.ALWAYS,
            Gst.Caps.new_any(),
        ),
        Gst.PadTemplate.new("sink",
            Gst.PadDirection.SINK,
            Gst.PadPresence.ALWAYS,
            Gst.Caps.new_any(),
        )
    )

    __gproperties__ = {}

    def __init__(self):
        super(GstDropFrames, self).__init__()
        print("Initialized GstDropFrames")

    def do_src_event(self, event):
        super(GstDropFrames, self).do_src_event(event)