exp/rvcl: adding default config param consts and changing flag name

exp/rvcl/main.go

@@ -96,6 +96,16 @@ const (
 	fMode   = 0777
 )
 
+// Default config parameters.
+const (
+	defaultInput = "File"
+	defaultInputPath =  "../../../test/test-data/av/input/betterInput.h264"
+	defaultFileFPS =     "25"
+	defaultOutput  =   "RTP"
+	defaultRTPAddress = "localhost:6970"
+	defaultLoop       = "true"
+)
+
 // canProfile is set to false with revid-cli is built with "-tags profile".
 var canProfile = false
 
@@ -150,7 +160,7 @@ func main() {
 	var (
 		configPtr     = flag.String("config", "", "Provide configuration JSON to revid (see readme for further information).")
 		configFilePtr = flag.String("config-file", "", "Location of revid configuration file (see readme for further information).")
-		rtpAddrPtr    = flag.String("addr", "localhost:6970", "RTP destination address (<ip>:<port>)(common port=6970)")
+		rtpAddrPtr    = flag.String("rtp-addr", defaultRTPAddress, "RTP destination address (<ip>:<port>)(common port=6970)")
 	)
 	flag.Parse()
 
@@ -185,12 +195,12 @@ func main() {
 	// No config information has been provided; provide a default config map.
 	default:
 		cfg = map[string]string{
-			"Input":      "File",
-			"InputPath":  "../../../test/test-data/av/input/betterInput.h264",
-			"FileFPS":    "25",
-			"Output":     "RTP",
+			"Input":      defaultInput,
+			"InputPath":  defaultInputPath,
+			"FileFPS":    defaultFileFPS,
+			"Output":     defaultOutput,
 			"RTPAddress": *rtpAddrPtr,
-			"Loop":       "true",
+			"Loop":       defaultLoop,
 		}
 	}
 	log.Info("got config", "config", cfg)