def get_tracks_in_frame(frame_ind, track_list):
    """ Return list of all tracks present in frame ind. """
    
    tracks_in_frame = []
    for track in track_list:
        if (track['last_frame'] >= frame_ind 
                and track['first_frame'] <= frame_ind):
            tracks_in_frame.append(track)
    return tracks_in_frame