Implement input only mode w/ double framerate for virtual display

src/rtsp.cpp

@@ -1056,6 +1056,8 @@ namespace rtsp_stream {
         config.monitor.encodingFramerate = config.monitor.framerate;
       }
 
+      config.monitor.input_only = session.input_only;
+
       configuredBitrateKbps = util::from_view(args.at("x-ml-video.configuredBitrateKbps"sv));
     }
     catch (std::out_of_range &) {
@@ -1099,6 +1101,8 @@ namespace rtsp_stream {
       config.audio.flags[audio::config_t::CUSTOM_SURROUND_PARAMS] = valid;
     }
 
+    config.audio.input_only = session.input_only;
+
     // If the client sent a configured bitrate, we will choose the actual bitrate ourselves
     // by using FEC percentage and audio quality settings. If the calculated bitrate ends up
     // too low, we'll allow it to exceed the limits rather than reducing the encoding bitrate