To decode a stream you need at least 3 filters. The first one is the splitter, which splits the video stream from the audio stream. After that, the video stream is decoded by the video decoder and the audio one, by the audio decoder. CoreAVC is a video decoder, and it can be used only if a splitter feeds it with a video stream. So, first you need to have an MKV splitter, such as Haali or Gabest MKV splitter.
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