human
Solve the following python programming problem given the following code:
def calculate_shifts(src_stream, dst_stream, groups_list, normal_window, max_window, rewind_thresh) : 
    def log_shift(state) : 
        logging.debug ('{0}-{1}: shift: {2:0.12f}, diff: {3:0.12f}'.format (format_time (state ['start_time']), format_time (state ['end_time']), state ['shift'], state ['diff'])) 
small_window = 1.5 
    idx = 0 
    committed_states = [] 
    uncommitted_states = [] 
    window = normal_window 
    while (idx < len (groups_list)) : 
        search_group = groups_list [idx] 
        tv_audio = src_stream.get_substream (search_group [0].start, search_group [(- 1)].end) 
        original_time = search_group [0].start 
        group_state = { 
            'start_time' : search_group [0].start, 
            'end_time' : search_group [(- 1)].end, 
            'shift' : None, 
            'diff' : None, 
} 
        last_committed_shift = (committed_states [(- 1)] ['shift'] if committed_states else 0) 
        diff = new_time = None 
        if (not uncommitted_states) : 
            if ((original_time + last_committed_shift) > dst_stream.duration_seconds) : 
                group_state.update ({ 
                    'shift' : None, 
                    'diff' : None, 
}) 
                committed_states.append (group_state) 
                idx += 1 
                continue 
if (small_window < window) : 
                (diff, new_time) = dst_stream.find_substream (tv_audio, (original_time + last_committed_shift), small_window) 
if ((new_time is not None) and (abs_diff ((new_time - original_time), last_committed_shift) <= ALLOWED_ERROR)) : 
                group_state.update ({ 
                    'shift' : (new_time - original_time), 
                    'diff' : diff, 
}) 
                committed_states.append (group_state) 
                log_shift (group_state) 
                if (window != normal_window) : 
                    logging.debug ('Going back to window {0} from {1}'.format (normal_window, window)) 
                    window = normal_window 
idx += 1 
          ...

    
    

    Fix the buggy line: shift = (new_time - log_shift)
assistant
#Here is Python program to fix the buggy line: shift = (new_time - log_shift)
.

shift = (new_time - original_time)