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This is working:

import sys
import gi

gi.require_version('Gst', '1.0')
gi.require_version('GstRtspServer', '1.0')
from gi.repository import Gst, GstRtspServer, GLib

loop = GLib.MainLoop()
Gst.init(None)


class MyFactory(GstRtspServer.RTSPMediaFactory):
    def __init__(self, **properties):
        super(MyFactory, self).__init__(**properties)
        self.launch_string = "( videotestsrc is-live=1 ! x264enc ! rtph264pay name=pay0 pt=96 )"

    def do_create_element(self, url):
        return Gst.parse_launch(self.launch_string)


class GstServer(GstRtspServer.RTSPServer):
    def __init__(self, **properties):
        super(GstServer, self).__init__(**properties)
        self.factory = MyFactory()
        self.factory.set_shared(True)
        self.get_mount_points().add_factory("/test", self.factory)
        self.attach(None)


server = GstServer()
loop.run()

vlc rtsp://127.0.0.1/8554

This crashes the python script:

import sys
import gi

gi.require_version('Gst', '1.0')
gi.require_version('GstRtspServer', '1.0')
from gi.repository import Gst, GstRtspServer, GLib

loop = GLib.MainLoop()
Gst.init(None)


class MyFactory(GstRtspServer.RTSPMediaFactory):
    def __init__(self, **properties):
        super(MyFactory, self).__init__(**properties)
        permissions = GstRtspServer.RTSPPermissions()
        permissions.add_permission_for_role("user", "media.factory.access", True)
        permissions.add_permission_for_role("user", "media.factory.construct", True)
        self.set_permissions(permissions)
        self.launch_string = "( videotestsrc is-live=1 ! x264enc ! rtph264pay name=pay0 pt=96 )"

    def do_create_element(self, url):
        return Gst.parse_launch(self.launch_string)


class GstServer(GstRtspServer.RTSPServer):
    def __init__(self, **properties):
        super(GstServer, self).__init__(**properties)
        self.factory = MyFactory()
        self.factory.set_shared(True)
        self.get_mount_points().add_factory("/test", self.factory)
        self.attach(None)


server = GstServer()
auth = GstRtspServer.RTSPAuth()
token = GstRtspServer.RTSPToken()
token.set_string('media.factory.role', "user")
basic = GstRtspServer.RTSPAuth.make_basic("user", "password")
auth.add_basic(basic, token)
server.set_auth(auth)

loop.run()

vlc rtsp://user:password@127.0.0.1:8554

ERROR:../gst-rtsp-server-1.18.5/gst/rtsp-server/rtsp-media.c:2730:gst_rtsp_media_get_rates: assertion failed: (FALSE)

But this is working:

vlc rtsp://127.0.0.1:8554

Enter username and password in the login window from vlc