you need it downmixed, otherwise it would makes no sense, since you would miss al dialouges from the center (at least when its a properly encoded track)
why can't it just merge the audio streams again, i simply cannot be arsed to maintain a parallel video archive for my n900, nor should i need to be.
Both of these codecs are said to work above... Anyone know what the problem might be?
AC3 was confirmed to run out of the Box (can't confirme self as I don't have the device yet). Some post above your's it was said that the N900 can.t handle 5.1 and as i see in your codec description ist 6channles.... I would reencode it to simple stereo...