So as of Mar 12, for Nexus 10, if I download MX Player from Google Play, install the Neon Alt codec and apply settings as in OP, does this work for anyone? I get errors after trying both versions so wondering if older APK for the player is needed, the .11 version won't install for me.
ROM: AOKP 4.2.2
APPS: USB Helper - NTFS works on OTG
MX Player .10 (found on filesharing site) - Used the OP .13 NEON ALT codec, HW (not +) video, SW audio.
So now I can finally just dump my MKV movies on a usb thumb and play them natively with my Nexus 10, thanks to everyone here.