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><A
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>12.2. Tag writing</A
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> Tag writing is done using the <A
HREF="http://gstreamer.freedesktop.org/data/doc/gstreamer/stable/gstreamer/html/GstTagSetter.html"
TARGET="_top"
><CODE
CLASS="classname"
>GstTagSetter</CODE
></A
>
interface. All that's required is a tag-set-supporting element in
your pipeline. In order to see if any of the elements in your
pipeline supports tag writing, you can use the function
<CODE
CLASS="function"
>gst_bin_iterate_all_by_interface (pipeline,
GST_TYPE_TAG_SETTER)</CODE
>. On the resulting element, usually
an encoder or muxer, you can use <CODE
CLASS="function"
>gst_tag_setter_merge
()</CODE
> (with a taglist) or <CODE
CLASS="function"
>gst_tag_setter_add
()</CODE
> (with individual tags) to set tags on it.
</P
><P
> A nice extra feature in <SPAN
CLASS="application"
>GStreamer</SPAN
> tag support is that tags are
preserved in pipelines. This means that if you transcode one file
containing tags into another media type, and that new media type
supports tags too, then the tags will be handled as part of the
data stream and be merged into the newly written media file, too.
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