      def _audio_codec(self) -> Optional[str]:
          """ str or ``None``: The audio codec to use. This will either be ``"copy"`` (the default)
          or ``None`` if skip muxing has been selected in configuration options, or if frame ranges
          have been passed in the command line arguments. """
          retval: Optional[str] = "copy"
          if self.config["skip_mux"]:
              logger.info("Skipping audio muxing due to configuration settings.")
              retval = None
          elif self._frame_ranges is not None:
              logger.warning("Muxing audio is not supported for limited frame ranges."
 
</s> remove     def _get_frame_ranges(self) -> T.Optional[T.List[T.Tuple[int, int]]]:
 </s> add     def _get_frame_ranges(self) -> list[tuple[int, int]] | None: </s> remove         retval: T.List[DetectedFace] = []
 </s> add         retval: list[DetectedFace] = [] </s> remove     def _launch_thread(self) -> Optional[FSThread]:
 </s> add     def _launch_thread(self) -> FSThread | None: </s> remove     def _get_active_devices(self) -> List[int]:
 </s> add     def _get_active_devices(self) -> list[int]: </s> remove         data: Dict[str, Any] = {}
 </s> add         data: dict[str, T.Any] = {}
        retval: str | None = "copy"
      def _audio_codec(self) -> Optional[str]:
          """ str or ``None``: The audio codec to use. This will either be ``"copy"`` (the default)
          or ``None`` if skip muxing has been selected in configuration options, or if frame ranges
          have been passed in the command line arguments. """
        retval: str | None = "copy"
          if self.config["skip_mux"]:
              logger.info("Skipping audio muxing due to configuration settings.")
              retval = None
          elif self._frame_ranges is not None:
              logger.warning("Muxing audio is not supported for limited frame ranges."
keep keep keep keep replace keep keep keep keep keep
 Rebase code (#1326)

* Remove tensorflow_probability requirement

* setup.py - fix progress bars

* requirements.txt: Remove pre python 3.9 packages

* update apple requirements.txt

* update INSTALL.md

* Remove python<3.9 code

* setup.py - fix Windows Installer

* typing: python3.9 compliant

* Update pytest and readthedocs python versions

* typing fixes

* Python Version updates
  - Reduce max version to 3.10
  - Default to 3.10 in installers
  - Remove incompatible 3.11 tests

* Update dependencies

* Downgrade imageio dep for Windows

* typing: merge optional unions and fixes

* Updates
  - min python version 3.10
  - typing to python 3.10 spec
  - remove pre-tf2.10 code
  - Add conda tests

* train: re-enable optimizer saving

* Update dockerfiles

* Update setup.py
  - Apple Conda deps to setup.py
  - Better Cuda + dependency handling

* bugfix: Patch logging to prevent Autograph errors

* Update dockerfiles

* Setup.py - Setup.py - stdout to utf-8

* Add more OSes to github Actions

* suppress mac-os end to end test 
plugins/convert/writer/ffmpeg.py