From f92d29d20f8d39266060782a925ebbec883b2df2 Mon Sep 17 00:00:00 2001
From: Martin Pulec <martin.pulec@cesnet.cz>
Date: Thu, 16 Nov 2023 11:20:22 +0100
Subject: [PATCH] Reed-Solomon: addd notice about per-frame protect

---
 src/rtp/rs.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/rtp/rs.cpp b/src/rtp/rs.cpp
index a6bd74774..36d17faa5 100644
--- a/src/rtp/rs.cpp
+++ b/src/rtp/rs.cpp
@@ -45,6 +45,7 @@
 #include "rtp/rs.h"
 #include "ug_runtime_error.hpp"
 #include "utils/color_out.h"
+#include "utils/text.h"
 
 #define DEFAULT_K 200
 #define DEFAULT_N 240
@@ -416,5 +417,11 @@ static void usage() {
                 "(default " TBOLD("%d") ", max %d),\n"
                 "\t\t\tmust be > <k>\n\n",
                 DEFAULT_K, MAX_K, DEFAULT_N, MAX_N);
-}
 
+        char desc[] =
+            "The n/k ratio determines the redundancy that the FEC provides. "
+            "But please note that the " TUNDERLINE("strength")
+            " of the FEC applies " TBOLD ("per frame") " basis, so 20%"
+            " redundancy will cover 20% loss in a signle frame only.\n";
+        color_printf("%s\n", wrap_paragraph(desc));
+}