async def get_version(self, timeout: int = 15) -> Optional[str]:
        """Execute FFmpeg process and parse the version information.

        Return full FFmpeg version string. Such as 3.4.2-tessus
        """
        command = ["-version"]
        # open input for capture 1 frame

        is_open = await self.open(cmd=command, input_source=None, output="")

        # error after open?
        if not is_open:
            _LOGGER.warning("Error starting FFmpeg.")
            return

        # read output
        try:
            proc_func = functools.partial(self._proc.communicate, timeout=timeout)
            output, _ = await self._loop.run_in_executor(None, proc_func)

            result = re.search(r"ffmpeg version (\S*)", output.decode())
            if result is not None:
                return result.group(1)

        except (subprocess.TimeoutExpired, ValueError):
            _LOGGER.warning("Timeout reading stdout.")
            self.kill()

        return None
Execute FFmpeg process and parse the version information.

        Return full FFmpeg version string. Such as 3.4.2-tessus