Hi Everyone,
There is a new .wav file on the quality link of the LAME web site. It
was sent to me by Scott Miller <[EMAIL PROTECTED]>. It contains
some higher frequency modes which are isolated to the left channel.
LAME sounds fine in Stereo mode (-m s), but using any type of mid/side
stereo will spread these modes to the right channel. Switching
between stereo and ms_stereo will result in the annoying effect of
having them turn on and off in the right channel. The FhG encoder
avoids this problem by using very few mid/side stereo frames. But the
LAME mid/side stereo switching criterion can not detect that this
sample should not be encode with mid/side stereo, and produces too
many mid/side frames.
Any suggestions for a better switching criterion?
I've tried a few things, but anything that works is
usually too restrictive, i.e. it will turn off mid/side stereo for
half the frames in castanets.wav, but castanets.wav should have
all frames mid/side stereo.
One thing that I haven't tried but I know will work:
have outer_loop encode both mid/side and L/R, and then take the
encoding with the least distortion. the value of "over"
(number of bands with audible distortion) is around 10 in the
mid/side case, and only around 5 for the L/R case.
Mark
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