[tebasuna51]

Originally Posted by Blue_MiSfit

This one is the 3.1ch 640kbps AC3 track from the BluRay release of Bubble. eac3to complains about encoding it down to a 2ch AC3:

How can I convert this bad boy down to 2ch, 192kbps Dolby Digital properly?

Select your preferred downmix

function Dmix3Stereo(clip a)  # 3 Channels L,R,C
{
  flr = GetChannel(a, 1, 2)
  fcc = GetChannel(a, 3, 3)
  return MixAudio(flr, fcc, 0.5858, 0.4142)
}
function Dmix4lStereo(clip a)  # 4 Channels L,R,C + LFE
{
  flr = GetChannel(a, 1, 2)
  fcc = GetChannel(a, 3, 3)
  lfe = GetChannel(a, 4, 4)
  clf = MixAudio(fcc, lfe, 0.2929, 0.2929)
  return MixAudio(flr, clf, 0.4142, 1.0)
}
NicAc3Source("Bubble.ac3")
Dmix3Stereo
#Dmix4lStereo
Normalize()

And encode with EncWAVtoAC3 v3.0b