docs: def set_video_config(self, video_config):
          '''
          .. versionchanged:: 0.6.1
              Log video source process ID.
          '''
          self.video_config = video_config
          if video_config is None:
              self.disable_video()
              return
  
          py_exe = sys.executable
          port = self.canvas_slave.video_sink.socket_info['port']
          transport = self.canvas_slave.video_sink.socket_info['transport']
          host = (self.canvas_slave.video_sink.socket_info['host']
                  .replace('*', 'localhost'))
  
          # Terminate existing process (if running).
          self.cleanup_video()
  
          # Launch new video source process using JSON serialized video
          # configuration.
          command = [py_exe, '-m', 'pygst_utils.video_view.video_source',
                     'fromjson', '-p', str(port), transport, host,
                     video_config.to_json()]
          logger.info(' '.join(command))
          self.video_source_process = sp.Popen(command)
          logger.info('Launched video source process: %s',
                      self.video_source_process.pid)
          self.canvas_slave.enable()