from datetime import datetime
from typing import Optional, Tuple

def get_current_playback(media: dict) -> Tuple[Optional[int], Optional[int]]:
    """
    Extracts playback start and end positions from a Jellyfin media item dictionary.

    Args:
        media (dict): The Jellyfin media item dictionary.
    Returns:
        Tuple[Optional[int], Optional[int]]: A tuple containing the start and end positions in seconds, or (None, None) if the media is paused.
    """
    play_state = media.get('PlayState', {})
    is_paused = play_state.get('IsPaused', False)

    if is_paused:
        return (None, None)

    runtime_ticks = media.get('RunTimeTicks', -1)
    playback_position_ticks = play_state.get('PositionTicks', -1)

    if runtime_ticks < 0 or playback_position_ticks < 0:
        return (None, None)

    total_runtime_seconds = runtime_ticks // 10_000_000
    playback_position_seconds = playback_position_ticks // 10_000_000

    start = int(datetime.now().timestamp()) - playback_position_seconds
    end = start + total_runtime_seconds

    return (start, end)