This plugin stood out while reformatting the plugins, so I had a look at it and noticed that it wasn't only in really bad shape, but also completely broken. It's probably not useful to keep it, as nobody's opened a plugin issue for it, but fixing it was simple, so let's just do that...
$ ./script/test-plugin-urls.py ruv
:: https://www.ruv.is/sjonvarp/beint/ruv
:: 360p, 432p, 576p, 720p_alt, 720p, worst, best
:: https://www.ruv.is/sjonvarp/beint/ruv2
:::: The content is not available in your region
!! No streams found
:: https://www.ruv.is/sjonvarp/spila/kastljos/35422/ahpu2g
:: 360p, 480p, 720p, 1080p, worst, best
:: https://www.ruv.is/sjonvarp/spila/vedur/30766/agcf5m
:: 360p, 480p, 720p, 1080p, worst, best
:: https://www.ruv.is/utvarp/beint/ras1
:: 350k, worst, best
:: https://www.ruv.is/utvarp/beint/ras2
:: 350k, worst, best
:: https://www.ruv.is/utvarp/spila/laesi/37102/b1qk71
:: vod, worst, best