format the help info

@@ -1136,9 +1136,10 @@ int main(int argc, char * argv[])
 		printf("   run ffmpeg to merge audio and video files according to the record info file,\nusage:");
 		printf("\n   %s record_info_filename [-p] [-k]", argv[0]);
 		printf("\n   -p :only print the command,don't run ffmpeg");
-		printf("\n   -k :keep the temp files\n");
-		printf("\n   -c :only convert mp4 files\n");
-		printf("\n   -t :recodec h264\n");
+		printf("\n   -k :keep the temp files");
+		printf("\n   -c :only convert mp4 files");
+		printf("\n   -t :recodec h264");
+		printf("\n");
 		return -1;
 	}