For a couple of days now rtlXL's non-DRM adaptive (m3u8) streams don't work anymore. By undoing the adaptive -> flash workaround youtube-dl returns the DRM streams again. Too bad for foreigners (geoblock).
The progressive streams still work fine.
Better to extract 'http://manifest.us.rtl.nl' from the json, I'd say. And I think it's better to use the default json-url to make it more futureproof.
Succesfully tested with tarball.