koreus: use avformat demuxer.

(cherry picked from commit ebc429058fcc3ab1e5064bb381c4151a8149bc32)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

share/lua/playlist/koreus.lua

@@ -49,7 +49,7 @@ function parse()
 
         vid_url = string.match( line, '(http://media%d?%.koreus%.com/%d+/%d+/[%w-]*%.mp4)' )
 		if vid_url then
-			return { { path = vid_url; name = name; description = description; artist = artist; arturl = arturl } }
+			return { { path = vid_url; name = name; description = description; artist = artist; arturl = arturl; options={":demux=avformat,ffmpeg"} } }
 		end
 	end
 end