diff --git a/plugins/input_rtsp/input_rtsp_node.cpp b/plugins/input_rtsp/input_rtsp_node.cpp
index e50da20..d68df36 100644
--- a/plugins/input_rtsp/input_rtsp_node.cpp
+++ b/plugins/input_rtsp/input_rtsp_node.cpp
@@ -4,6 +4,7 @@
 #include <iostream>
 #include <cstdio>
 #include <cstring>
+#include <cctype>
 #include <mutex>
 #include <string>
 #include <thread>
@@ -110,6 +111,22 @@ public:
 
 private:
 #if defined(RK3588_ENABLE_FFMPEG)
+    static bool IContainsNoCase(const char* haystack, const char* needle) {
+        if (!haystack || !needle) return false;
+        const size_t nlen = std::strlen(needle);
+        if (nlen == 0) return true;
+        for (const char* p = haystack; *p; ++p) {
+            size_t i = 0;
+            while (i < nlen && p[i] &&
+                   std::tolower(static_cast<unsigned char>(p[i])) ==
+                       std::tolower(static_cast<unsigned char>(needle[i]))) {
+                ++i;
+            }
+            if (i == nlen) return true;
+        }
+        return false;
+    }
+
     static void InstallFfmpegLogFilterOnce() {
         static std::once_flag once;
         std::call_once(once, []() {
@@ -125,11 +142,11 @@ private:
                 buf[sizeof(buf) - 1] = '\0';
 
                 const char* item = avcl ? av_default_item_name(avcl) : "";
-                if (item && std::strstr(item, "rtsp") != nullptr) {
+                // Note: item name can be "rtsp" or "RTSP" depending on build.
+                if (InputRtspNode::IContainsNoCase(item, "rtsp")) {
                     // Seen during startup/probing on some cameras; not fatal if we later decode fine.
-                    if (std::strstr(buf, "decoding for stream") && std::strstr(buf, "failed")) {
-                        return;  // drop
-                    }
+                    if (InputRtspNode::IContainsNoCase(buf, "decoding for stream") && InputRtspNode::IContainsNoCase(buf, "failed")) return;
+                    if (InputRtspNode::IContainsNoCase(buf, "not enough frames to estimate rate")) return;
                 }
 
                 va_list vl_default;