Following simple guide show you how to convert MKV file encoded in DTS audio into AC3 audio in single step and within minutes. The time taken is very fast because you only re-encode the Audio.
- Click Open Video button, select the MKV Video file which required conversion
- In Video action, select Copy (with this No encoding needed)
- In Audio action, select AC3 (lavc)
- In output Format, select MKV
- Click Save Video button and give it a new name.
Download AviDemux at this link http://www.avidemux.org/