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diff --git a/readme.md b/readme.md
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--- a/readme.md
+++ b/readme.md
@@ -4,3 +4,4 @@
 - instead of writing ffmpeg commands to file maybe better to run them in go;
 - change metadata format from json to csv for lower memory consumption;
 - add config file; move constance to config file;
+- ffmpeg call should be unique;