Glib::Variant<Glib::ustring>::create(file_name_)}});
auto meta = context->create_meta_packet(
{{ConfigKey::SAMPLERATE, Glib::Variant<guint64>::create(
Glib::Variant<Glib::ustring>::create(file_name_)}});
auto meta = context->create_meta_packet(
{{ConfigKey::SAMPLERATE, Glib::Variant<guint64>::create(