Maybe-
http://www.bestsoftware4download.com...-yaqdmifp.html
http://www.riverpast.com/en/support/...rt/mkv/avi.php
Google for the latest ffdshow Decoder filter and install it, and your problems should be gone. Your anime likely is containing some AAC audio, and we are aware that there is a bug in CoreAAC right now, the AAC audio decoder we normally provide with our pack.
Installing the latest ffdshow will fix this problem, alternatively there is an updated CoreAAC here :
http://coreaac.corecodec.org .
Soon we plan to launch the 1.2.0 version of our packs, fixing this also.
Christian
matroska project admin
http://www.matroska.org