Update metadata.md - fix function names
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@ -169,8 +169,8 @@ pipeline.
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In order to see if any of the elements in your pipeline supports tag writing,
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you can use the function `gst_bin_iterate_all_by_interface (pipeline, GST_TYPE_TAG_SETTER)`.
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On the resulting element, usually an encoder or muxer, you can use
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`gst_tag_setter_merge ()` with a taglist or `gst_tag_setter_add ()` with
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individual tags, to set tags on it.
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`gst_tag_setter_merge_tags ()` with a taglist or `gst_tag_setter_add_tags ()`
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with individual tags, to set tags on it.
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A nice extra feature in GStreamer's tag support is that tags are preserved
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in pipelines. This means that if you transcode one file containing tags
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