add -n to support only merge pip,that is the input file is the output of merge_av

@@ -1452,6 +1452,8 @@ int main(int argc, char * argv[])
 
 	load_codec_param();
 
+	bool bmerge_files = true;
+
 	for (int i = 3; i < argc; i++){
 		if (!strcmp(argv[i], "-p")){
 			only_print = true;
@@ -1459,28 +1461,39 @@ int main(int argc, char * argv[])
 		else if (!strcmp(argv[i], "-k")){
 			keep_tmp_files = true;
 		}
+		else if (!strcmp(argv[i], "-n")){
+			bmerge_files = false;
+		}
 	}
 
 	char merged_info1[1024];
-	if (readfile(argv[1]) < 0) {
-		printf("open file: %s error", argv[1]);
-		return -2;
-	}
+	char merged_info2[1024];
 
-	get_outinfo_file_name(argv[1]);
-	strcpy(merged_info1, out_info_file);
-	process_record_file_to_ts();
+	if (bmerge_files) {
+		if (readfile(argv[1]) < 0) {
+			printf("open file: %s error", argv[1]);
+			return -2;
+		}
 
+		get_outinfo_file_name(argv[1]);
+		strcpy(merged_info1, out_info_file);
+		process_record_file_to_ts();
 
-	char merged_info2[1024];
-	if (readfile(argv[2]) < 0) {
-		printf("open file: %s error", argv[1]);
-		return -2;
-	}
 
-	get_outinfo_file_name(argv[2]);
-	strcpy(merged_info2, out_info_file);
-	process_record_file_to_ts();
+
+		if (readfile(argv[2]) < 0) {
+			printf("open file: %s error", argv[1]);
+			return -2;
+		}
+
+		get_outinfo_file_name(argv[2]);
+		strcpy(merged_info2, out_info_file);
+		process_record_file_to_ts();
+	}
+	else {
+		strcpy(merged_info1, argv[1]);
+		strcpy(merged_info2, argv[2]);
+	}
 
 
 	media_files.clear();
@@ -1498,7 +1511,7 @@ int main(int argc, char * argv[])
 
 	process_merged_files_to_pip_files();
 
-	if (!keep_tmp_files) {
+	if (!keep_tmp_files && bmerge_files) {
 		removefiles(all_input_files_for_pip);
 		remove_file(merged_info1);
 		remove_file(merged_info2);