To play a stream inside a container, such as MKV, you need 3 filters. A splitter, that split the audio and video streams and any other stream inside (such as subtitles). An video decoder (such as CoreAVC) and an audio decoder, such as AC3Filter. You seem to lack the splitter. So, install either Gabest MKV splitter or Haali media splitter.
On the other hand, MKVs usually don't have MP3 audio, but AC3 or DTS.
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