MKV2AC3 converts MKV input files to AC3 format. MKV2AC3 is a simple tool that converts MKV with DTS to MKV with AC3 Audio. Does batch conversion. It only accepts MKVs sources ( for now ) and transforms : DTS -> AC3 AAC -> AC3, AC3 -> AC3 ( normalized ).
* AviSynth frameserver
The license of this software is Freeware, you can free download and free use this audio converter software.