Handling errors with gst-rtsp-server Python bindings

I have a simple Python program creates an RTSP stream using gst-rtsp-server. It works, but as-is there's no error handling. If the pipeline has a typo or there's some issue connecting to the video source, I don't see a stack trace or any logging. Where would I hook in code to handle problems like this?

I should mention that I'm a complete beginner to the GObject world. I suspect there is a standard way for these libraries to report errors but I haven't been able to find anything in the documentation I've read about how that's done.

In case it's helpful, here is my code as I have it right now:

from threading import Thread
from time import sleep
import signal

import gi
gi.require_version("Gst", "1.0")
gi.require_version("GstRtsp", "1.0")
gi.require_version("GstRtspServer", "1.0")
from gi.repository import GLib, GObject, Gst, GstRtsp, GstRtspServer

PIPELINE = (
    "( videotestsrc ! vp8enc ! rtpvp8pay name=pay0 pt=96 )")


def main():
    GObject.threads_init()
    Gst.init(None)

    server = GstRtspServer.RTSPServer.new()
    server.props.service = "3000"

    server.attach(None)

    loop = GLib.MainLoop.new(None, False)

    def on_sigint(_sig, _frame):
        print("Got a SIGINT, closing...")
        loop.quit()
    signal.signal(signal.SIGINT, on_sigint)

    def run_main_loop():
        loop.run()

    main_loop_thread = Thread(target=run_main_loop)

    main_loop_thread.start()

    media_factory = GstRtspServer.RTSPMediaFactory.new()
    media_factory.set_launch(PIPELINE)
    media_factory.set_shared(True)
    server.get_mount_points().add_factory("/test", media_factory)
    print("Stream ready at rtsp://127.0.0.1:3000/test")


    while loop.is_running():
        sleep(0.1)


if __name__ == "__main__":
    main()

So you can override do_handle_message in Gst.Bin in the following way:

import gi
gi.require_version("Gst", "1.0")
from gi.repository import Gst, GLib
Gst.init(None)

class SubclassBin(Gst.Bin):
    def do_handle_message(self, message):
        if message.type == Gst.MessageType.ERROR:
            error, message = message.parse_error()
            # TODO: Do something with the error
        # Call the base Gst.Bin do_handle_message
        super().do_handle_message(self, message)

subclass_bin = SubclassBin("mybin")

That said, I'm not sure how to tell GstRtspServer.RTSPMediaFactory to use SubclassBin instead of Gst.Bin because as far as I can tell, the only way to connect any Bin to RTSPMediaFactory is through the set_launch method which wants a pipeline string instead of a prebuilt bin. If there was a way of adding a prebuilt bin to RTSPMediaFactory, this would be a complete answer...but unfortunately this is as far as I can get.