# Pastebin c0DwVJmj
					int32_t matrix[9];
					av_display_rotation_set(matrix, 90);

					uint8_t *sd = av_packet_new_side_data(&packet_clip, AV_PKT_DATA_DISPLAYMATRIX, sizeof(int32_t) * 9);
					
					if (!sd) printf("fail\n");
					memcpy(sd, matrix, sizeof(int32_t) * 9);
					
					printf("rotating\n");