Add scale factor w/ use server UUID for monitor GUID if client uid not present

src/rtsp.h

@@ -34,6 +34,7 @@ namespace rtsp_stream {
     bool enable_hdr;
     bool enable_sops;
     bool virtual_display;
+    uint32_t scale_factor;
 
     std::optional<crypto::cipher::gcm_t> rtsp_cipher;
     std::string rtsp_url_scheme;