Usually, MKV 1080p files are x264 compressed. It can also be WMV, DivX or Xvid (in this order of probability).
To know ehich of them we talk about, open the file, rightclick -> options -> filters and post here filters used to decode the file.
If as video decoder appears ffdshow, then click on it and it will open a window in which it's specified what kind of decompresion it's used.
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