Generating and posting preview image always comes with a performance
penalty so set default value as false. The preview-caps property that
defines the preview image format is also NULL by default, so instead
of generating preview image of unspecified format by default explicit
action from application should be required for enabling preview image
posting feature.
Application also has to add custom code to be able
to handle preview messages on its message handling function anyway.
#define DEFAULT_MODE MODE_IMAGE
#define DEFAULT_LOCATION "cap_%d"
-#define DEFAULT_POST_PREVIEWS TRUE
+#define DEFAULT_POST_PREVIEWS FALSE
#define DEFAULT_MUTE_AUDIO FALSE
#define DEFAULT_IDLE TRUE
#define DEFAULT_FLAGS 0