Does the -ms option use half the bitrate for each channel or does it change
from from frame to frame?
----- Original Message -----
From: Robert Hegemann <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 30, 2000 2:03 PM
Subject: Re: Re: [MP3 ENCODER] Masking in stereo
> Ross wrote:
> > Shawn Riley wrote:
> >
> > > So the encoder would have a cow if it was using forced JS & that
> > happened?
> >
> > Mark, can you mention if LAME can turn off joint-stereo when needed even
> > when -mj is specified. Or does it force it on for all frames?
> >
> > Thanks,
> > Ross.
>
> Hi Ross,
>
> just to make it clear, joint stereo is not M/S stereo.
> If you turn joint stereo on, the encoder is allowed to
> encode a frame as:
>
> - stereo
> - M/S stereo, M=(L+R)/SQRT2 S=(L-R)/SQRT2
> - intensity stereo, for some higher frequencies the
> mid channel M together with a little information
> about the position (more left,middle,little bit more right)
>
> It is then on the encoder to make the best use out of it.
>
> So, for LAME we don't have intensity stereo, the channel
> modes go like this:
>
> -mj LAME decides to encode the actual frame as stereo
> or M/S stereo, depending on the output of GPSYCHO,
> our psychoacoustic model in LAME. As a result you
> may get a mp3 like <st><st><ms><ms><st><ms><st>...
>
> -mf LAME encodes all frames in M/S stereo
>
> -ms LAME encodes all frames in stereo
>
> -mm LAME encodes all frames in mono
>
> Ciao Robert
>
> --
>
> Robert Hegemann:
>
> e-mail at university: [EMAIL PROTECTED]
> private: [EMAIL PROTECTED]
> [EMAIL PROTECTED]
>
> my homepage: http://linux.unixcity.de/catwalk/index.html
>
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