Why can't I change the audio track when I play mpeg2, VOB, or MKV file?

If you don't have K-Lite Codec Pack install yet, then download and install it first.

You can down the codecs here K-Lite_Codec_Pack_670_Full.exe

Then we need to adjust some settings in K-Lite Codec Pack.

Go to Start -> K-Lite Codec Pack -> Codec Tweak Tool -> Manage Directshow filters


Then, enable the following 3 codecs.
Matroske splitter (Haali), MPEG-TS splitter (Haali), MPEG-PS splitter (Haali)