Only set stereo_mode parameter of transcoder when not empty

transcoder/liquidsoap.go

@@ -100,7 +100,9 @@ func liquidsoapFormatString(params *pb.EncodingParams) string {
 			outp = append(outp, "mono")
 		} else {
 			outp = append(outp, "stereo")
-			outp = append(outp, fmt.Sprintf("stereo_mode=\"%s\"", params.StereoMode))
+			if params.StereoMode != "" {
+				outp = append(outp, fmt.Sprintf("stereo_mode=\"%s\"", params.StereoMode))
+			}
 		}
 		outp = append(outp, fmt.Sprintf("samplerate=%d", params.SampleRate))
 		switch params.Format {