The other day, I learnt there's something called DTS-HD and I found that programmes like tsMuxer are able to extract the DTS part and discard the "extended information" without having to reencode. I was also interested to know if converting into AC3, either from the original DTS-HD or from the DTS makes a difference, and I found different opinions. Having said that, I'd like to ask you and know your opinion (and anybody's) about three issues: