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

[TrNSZ]

What do you mean by Dolby Surround? If you are speaking of files that are hinted for the Dolby Pro Logic technology, then using --alt-preset standard should be adequate for most samples to preserve most imaging, but I would certaintly recommend using "extreme" for the extra headroom.

I can remember back to when the r3mix preset was being moved to use VBR MTRH method, and there was some testing of Pro Logic encoded with LAME MP3. I believe it was found that the rear channels had definate weirdness when nssafejoint (nsmsfix=1.0) wasn't used. Keep in mind that was a non-scientific test done ages ago that wouldn't fly around HA nowadays without some real testing.