int yv12_setup (vo_instance_t * _instance, int width, int height,vo_setup_result_t *result)
int yv12_setup (vo_instance_t * _instance, unsigned int width, unsigned int height,unsigned int chroma_w,unsigned  int chroma_h,vo_setup_result_t *result)
int yv12_setup (vo_instance_t * _instance, int width, int height,vo_setup_result_t *result){	yv12_instance_t *ins;	ins=(yv12_instance_t *)_instance;	ins->w=width;	ins->h=height;    result->convert=NULL;    printf(" YV12 setup called\n");    return 0;}