... um well first just try running the mkv through directshowsource in vdubmod...
------>this is how you do it:
required tools:
<a href="
http://haali.cs.msu.ru/mkv/">Haali Media Splitter</a>
<a href="
http://www.doom9.org/">AviSynth 2.57</a>
<a href="
http://www.doom9.org/">VirtualDubMod 1.5.10.1</a>
probably <a href="
http://www.doom9.org/">ffdshow?</a>
-create a new text file
-write this: directshowsource("C:\filepathofyourmkv.mkv")
-save file
-change the file extension from .txt to .avs (show extensions in windows explorer by going Tools>>Folder Options>>view>>uncheck 'hide extensions for known file types')
-open the .avs file in VirtualDubMod
----------------------
and that link there isn't half bad either
like it says, things you'll definitely need:
matroska / MKV Codec : i'd get the Haali Media Splitter and ffdshow
Ogg DirectShow Filter / OggDS / OGM Codec : i'd get avisynth
VirtualdubMod: ditto
Lame MP3: ---
-----------------------
as far as I know, videohelp.com is legit, but it's understandable if you want a second opinion