Lame and surround Options

[Fr4nz]

Hi guys. I've read many past threads about Lame and encoding movies soundtracks from AC3 to Dolby Surround1/2. While many people claim that Lame preserves the phase informations thanks to its safe joint stereo mode, in this thread http://www.hydrogenaudio.org/forums/index....t=0&#entry47454 it's stated that only at very high bitrates (for e.g. --alt-preset extreme or insane(!!)) Lame can conserve surround infos in a decent way.

Anyway i've encoded lots of movie soundtracks with Lame, and the --alt-preset standard setting seems quite good to me for surround1/2 tracks.

Thanks for any answer!

Fr4nz

[Fr4nz]

II guess an interesting test would be to listen to the output of the surround from aps and aps nssafejoint.  If this can be ABX'd, then I think it would be smart to ABX alt-preset extreme vs. alt-preset standard + nssafejoint.  The bitrates will probably be very similar; the real test is to increase the quality of the "surround" channel without degrading the rest of the signal below the level of audible transparency.  Maybe someone else can define a better test methodology -- I've been up for two days now and might not be thinking straight. =)

I encoded an AC3 sample from matrix with --aps --nsmsfix 1.0 and --ape

--aps --nsmsfix 1.0 gave me ~198kbps

--ape gave me 242kbps!!!

So there's a great difference in terms of kbits between these 2 modes.

It would be nice to have a preset optimized for surround tracks like 2BDecided suggests