I would like to convert an existing DocBook documentation of an OpenSource project to Markdown. (There are about ~770 XML/DocBook files with ~190.000 LoC and ~7 MBytes of combined file size.

Outputting with a default pandoc -t markdown works well enough to continue with the project.

However, I would like to automatically get fenced code blocks in the output. Is that even possible? Or does pandoc support the +fenced_code_blocks extension only with input Markdown, not with output Markdown?

The command I tested with was

 pandoc -t markdown+fenced_code_blocks -f docbook -o rpcclient.1.md rpcclient.1.xml

Unfortunately, the output does contain only standard (indented by 4 spaces) code blocks. (The version of my pandoc is 1.13.2.)