static void MP4_FreeBox_stss( MP4_Box_t *p_box )
{
    FREENULL( p_box->data.p_stss->i_sample_number );
}
static void MP4_FreeBox_stss( MP4_Box_t *p_box )
{
    FREENULL( p_box->data.p_stss->i_sample_number );
}