UI: Add "audio_names" setting to FFmpeg output settings

UI/window-basic-main-outputs.cpp

@@ -1984,8 +1984,25 @@ inline void AdvancedOutput::SetupFFmpeg()
 		config_get_int(main->Config(), "AdvOut", "FFAEncoderId");
 	const char *aEncCustom =
 		config_get_string(main->Config(), "AdvOut", "FFACustom");
+
+	OBSDataArrayAutoRelease audio_names = obs_data_array_create();
+
+	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
+		string cfg_name = "Track";
+		cfg_name += to_string((int)i + 1);
+		cfg_name += "Name";
+
+		const char *audioName = config_get_string(
+			main->Config(), "AdvOut", cfg_name.c_str());
+
+		OBSDataAutoRelease item = obs_data_create();
+		obs_data_set_string(item, "name", audioName);
+		obs_data_array_push_back(audio_names, item);
+	}
+
 	OBSDataAutoRelease settings = obs_data_create();
 
+	obs_data_set_array(settings, "audio_names", audio_names);
 	obs_data_set_string(settings, "url", url);
 	obs_data_set_string(settings, "format_name", formatName);
 	obs_data_set_string(settings, "format_mime_type", mimeType);