WaterMark: fix filter init if locale does not use . as decimal

Change-Id: I26ddc4ba70a3d7c882a52ab6d5770bf09a26adb4

WaterMark/WatermarkVideoSubscriber.cpp

@@ -43,6 +43,8 @@ WatermarkVideoSubscriber::WatermarkVideoSubscriber(const std::string& dataPath,
     if (std::setlocale(LC_TIME, std::locale("").name().c_str()) == NULL) {
         Plog::log(Plog::LogPriority::INFO, TAG, "error while setting locale");
     }
+
+    std::setlocale(LC_NUMERIC, "C");
     fontFile_ = dataPath + sep + "Muli-Light.ttf";
 #ifdef WIN32
     for (int i = fontFile_.size(); i > 0; i--)