I think Ditto666 want encode to DTS, not decode. 1) Not exist a free DTS encoder then you need a commercial encoder like Surcode or ProEncoder. And yes, you need 6 mono inputs to use these encoders. Only eac3to can output .agm multichannel files to use in ProEncoder. 2) I don't know for what you need DTS files, use the more efficient and compatible AC3 or the much more efficient AAC.