Add option to ignore encoder probe failure

src/config.cpp

@@ -514,6 +514,7 @@ namespace config {
 
     "1920x1080x60",  // fallback_mode
     false, // isolated Display
+    false, // ignore_encoder_probe_failure
   };
 
   audio_t audio {
@@ -1199,6 +1200,7 @@ namespace config {
     int_f(vars, "max_bitrate", video.max_bitrate);
     string_f(vars, "fallback_mode", video.fallback_mode);
     bool_f(vars, "isolated_virtual_display_option", video.isolated_virtual_display_option);
+    bool_f(vars, "ignore_encoder_probe_failure", video.ignore_encoder_probe_failure);
 
     path_f(vars, "pkey", nvhttp.pkey);
     path_f(vars, "cert", nvhttp.cert);

src/config.h

@@ -147,6 +147,7 @@ namespace config {
 
     std::string fallback_mode;
     bool isolated_virtual_display_option;
+    bool ignore_encoder_probe_failure;
   };
 
   struct audio_t {

src/process.cpp

@@ -353,7 +353,11 @@ namespace proc {
     // due to hotplugging, driver crash, primary monitor change,
     // or any number of other factors).
     if (rtsp_stream::session_count() == 0 && video::probe_encoders()) {
-      return 503;
+      if (config::video.ignore_encoder_probe_failure) {
+        BOOST_LOG(warning) << "Encoder probe failed, but continuing due to user configuration.";
+      } else {
+        return 503;
+      }
     }
 
     std::string fps_str;