Cannot stream from inside a docker container without network_mode: "host"

[AndreiArdelean1]

Describe the bug

When trying to stream to either an AppleTV or a HomePod mini, it fails with RTSP/1.0 method SETUP failed with code 400: Bad Request

The RTSP stream binds to the docker network IP, not the host IP. Specifying an --address HOST_IP doesn't change the RTSP IP used.

Running it directly on the host works.

Error log

homeassistant:/config# atvremote --id XXXXXXX stream_file=http://XXXXXXX:8123/api/tts_proxy/XXXXXXX_en_-_google_translate.mp3
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/pyatv/scripts/atvremote.py", line 997, in _run_application
    return await cli_handler(loop)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/scripts/atvremote.py", line 726, in cli_handler
    return await _handle_commands(args, config, storage, loop)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/scripts/atvremote.py", line 876, in _handle_commands
    ret = await _handle_device_command(args, cmd, atv, storage, loop)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/scripts/atvremote.py", line 932, in _handle_device_command
    return await _exec_command(atv.stream, cmd, True, *cmd_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/scripts/atvremote.py", line 964, in _exec_command
    value = await tmp(*args)
            ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/core/facade.py", line 374, in stream_file
    await self.relay("stream_file")(
  File "/usr/local/lib/python3.12/site-packages/pyatv/protocols/raop/__init__.py", line 356, in stream_file
    await client.initialize(self.core.service.properties)
  File "/usr/local/lib/python3.12/site-packages/pyatv/protocols/raop/stream_client.py", line 338, in initialize
    await self._protocol.setup(self.timing_server.port, self.control_client.port)
  File "/usr/local/lib/python3.12/site-packages/pyatv/protocols/raop/protocols/airplayv2.py", line 109, in setup
    await self._setup_base(timing_server_port)
  File "/usr/local/lib/python3.12/site-packages/pyatv/protocols/raop/protocols/airplayv2.py", line 56, in _setup_base
    setup_resp = await self.rtsp.setup(
                     ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/support/rtsp.py", line 177, in setup
    return await self.exchange("SETUP", headers=headers, body=body)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/support/rtsp.py", line 294, in exchange
    resp = await self.connection.send_and_receive(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyatv/support/http.py", line 496, in send_and_receive
    raise exceptions.HttpError(
pyatv.exceptions.HttpError: RTSP/1.0 method SETUP failed with code 400: Bad Request

>>> An error occurred, full stack trace above

How to reproduce the bug?

Run atvremote --id XXXXXXX stream_file=http://XXXXXXX:8123/api/tts_proxy/XXXXXXX_en_-_google_translate.mp3 from a docker container without using network_mode: "host".

What is expected behavior?

A --host-ip and -host-port (I've seen it defaults to 5353) arguments should be introduced to be used for the RTSP stream.

Operating System

Docker

Python

3.12

pyatv

0.15.1

Device

Apple TV 4K (gen 2), tvOS 18.1 and HomePod Mini, tvOS 18.1

Additional context

In the Apple Home app settings, "Speakers & TV" is set to "Everyone".
Running pyatv directly on the host works.
I use an Avahi repeater to get mDNS messages to and from the docker network