AC3 Definition : 5.1 channels Audio compression standard created by Dolby Digital.

1. To convert AC3 to MP3, please install DVD players such as WinDVD player or PowerDVD  player, which include the AC3 decoder. Because MP3 format only supports 2 channel, please configure output audio channel as stereo in properties of AC3 decoder.

Or install the AC3 decoder.

2 Launch AUDIO/VIDEO TO MP3 MAKER,  click the Open Media File button, select an ac3 file.

3. If you want to convert the whole audio from the AC3 file, set the Output File if needed, then click the Convert button.

If you want to convert some part of audio from the AC3 file, drag the slide bar directly, or click the Play button to preview the media file, set the Start Time and the End Time. At last, click the Convert button to start to convert ac3 to mp3.

DTS stand for Digital Theatre System, a multichannel audio source for synchronized film movie sound.