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meta: Set the parent refcount of the GstStructure correctly

Nirbheek Chauhan requested to merge nirbheek/gstreamer:meta-set-parent-refcount-correctly into main

The parent refcount is of the transformed buffer, not the input buffer.

Also update the docs to clarify that @transbuf is the transformed buffer, and not the buffer on which a transformation is being performed.

Due to this bug, modifying the structure of a meta that has been copied to another buffer fails with:

gst_structure_set: assertion 'IS_MUTABLE (structure) || field == NULL' failed

Edited by Nirbheek Chauhan

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