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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def libvlc_video_get_track_description(p_mi):
    '''Get the description of available video tracks.
    @param p_mi: media player.
    @return: list with description of available video tracks, or NULL on error.
    '''
    f = _Cfunctions.get('libvlc_video_get_track_description', None) or \
        _Cfunction('libvlc_video_get_track_description', ((1,),), None,
                    ctypes.POINTER(TrackDescription), MediaPlayer)
    return f(p_mi)