Hi,
you need to use a referer paramter to get it work with LS.If you load the site and check the response in the webconsole of your browser then you can see it.
Just use it like this...
Code:
livestreamer --http-header "Referer=http://www.rtp.pt/play/direto/rtpafrica" "hlsvariant://http://rtp-pull-wrtp-live.hls.adaptive.level3.net/liverepeater/smil:rtpafrica.smil/playlist.m3u8" best
greetz