fix compile error in linux

@@ -4,6 +4,7 @@
 #include <iostream>
 #include <fstream>
 #include <vector>
+#include <string.h>
 
 bool only_print = false;
 using   namespace  std;
@@ -129,7 +130,7 @@ void concate_files(vector<string > merged_files)
 		strcat(buf, " ");
 		strcat(buf, merged_files[0].c_str());
 	}
-	strcat(buf ">");
+	strcat(buf, ">");
 #endif // WIN32
 	strcat(buf, " m.ts");
 	run_shell_cmd(buf);