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
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Robert Hegemann:
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