improve print info

print and return error if no paramter after "-t"

@@ -25,10 +25,10 @@ int CVideoDecoder::add(media_info &info)
 
 	if (_info.size() > 1) {
 		if (_is_finished == false) {
-			printf("add file:%s ,but the last file, %s, is not finished?", info.name.c_str(), _info[_info.size() - 2].name.c_str());
+			printf("\nadd file:%s ,but the last file, %s, is not finished?", info.name.c_str(), _info[_info.size() - 2].name.c_str());
 		}
 		else {
-			printf("add file:%s ,after the last file, %s", info.name.c_str(), _info[_info.size() - 2].name.c_str());
+			printf("\nadd file:%s ,after the last file, %s", info.name.c_str(), _info[_info.size() - 2].name.c_str());
 		}
 	}
 

@@ -1086,8 +1086,9 @@ int main(int argc, char * argv[])
 	for (int i = 2; i < argc; i++){
 		if (!strcmp(argv[i], "-t")){
 			i++;
-			if (i < argc) {
+			if (i > argc) {
 				printf("error,should be 0,1 or 2 after -t");
+				return -2;
 			}
 			piptype = atoi(argv[i]);
 		}