For compressed video formats i use ace mega codecs pack. With that i don't have problems watching any type of media formats. It has the "matroska,Ogg, ogm,divx,xvid and so on. Alsothere other even better packs, but this works well for me. For the mac people, just download the vlc player at:

www.videolan.org

and this is the ace mega codecs pack link


https://www.softpedia.com/progDownloa...load-6778.html