add_option (enc_opts, "sample-format", enum_2_string (sample_format()));
add_option (enc_opts, "dithering", enum_2_string (dither_type()));
add_option (enc_opts, "tag-metadata", _tag ? "true" : "false");
add_option (enc_opts, "tag-support", supports_tagging ? "true" : "false");
add_option (enc_opts, "broadcast-info", _has_broadcast_info ? "true" : "false");
add_option (enc_opts, "sample-format", enum_2_string (sample_format()));
add_option (enc_opts, "dithering", enum_2_string (dither_type()));
add_option (enc_opts, "tag-metadata", _tag ? "true" : "false");
add_option (enc_opts, "tag-support", supports_tagging ? "true" : "false");
add_option (enc_opts, "broadcast-info", _has_broadcast_info ? "true" : "false");