static void MP4_FreeBox_urn( MP4_Box_t *p_box )
{
    FREENULL( p_box->data.p_urn->psz_name );
    FREENULL( p_box->data.p_urn->psz_location );
}
static void MP4_FreeBox_urn( MP4_Box_t *p_box )
{
    FREENULL( p_box->data.p_urn->psz_name );
    FREENULL( p_box->data.p_urn->psz_location );
}