sg_roll_compare_entry 5019 src/isomedia/isom_write.c 	return gf_isom_set_sample_group_info(movie, track, sample_number, GF_4CC( 'r', 'o', 'l', 'l' ), 0, &roll_distance, sg_roll_create_entry, sg_roll_compare_entry);
sg_roll_compare_entry 5118 src/isomedia/isom_write.c 			return gf_isom_set_sample_group_info_ex(NULL, traf, 0, grouping_type, 0, udta, sg_roll_create_entry, sg_roll_compare_entry);