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Recently, I was looking for way to skeletonize buffer and besides solution with PostGIS and Postegre solutions there is algortihm v.voronoi.skeleton. I have tried to use it with different road/rail buffers as described in this tutorial (unfortunatelly in polish, though the best source I got).

Despite following instructions with different parametres and input layers I always get error with output and no layer is created.

2019-07-01T20:50:58     WARNING    Duplicate output OUTPUT_HTML_FILE registered for alg build_generic_plot
2019-07-01T20:50:58     WARNING    Duplicate output OUTPUT_JSON_FILE registered for alg build_generic_plot
  • Which GRASS GIS do you use? There was recently a bugfix in v.voronoi (used here): github.com/OSGeo/grass/pull/26 – markusN Jul 4 '19 at 6:06
  • QGIS 3.8.0 with GRASS 7.6.1, though the problem does noe seem to be about otuput, since there is none - error is printed without any new layer. – MarkZ Jul 5 '19 at 8:36
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I assume you are referring to the GRASS module v.voronoi, with the -s option to create a voronoi diagram around polygons. There is an open issue with this module.

I suggest that you first create centroids, and then try to run v.voronoi around those centroid points.

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