@Christian Niemeyer: I believe vbr-mean-bitrate actually requests ABR
encoding, which conflicts with vbr-quality=4, the switch that requests
VBR encoding.

@tigerdog: Nyquist's theorem dictates that the lowpass frequency needs
to be significantly lower than half of the bitrate (44100) to avoid
aliasing artefacts (which can be quite severe). I believe standalone
Lame internally sets the lowpass to 21000 when asked for CBR 320 (the
highest quality available), to 19500 when given -V 0 (the highest VBR
quality), and even lower for lower qualities. Anything higher than 21000
is considered unsafe with regard to aliasing.

@everyone: knowing just how many "internal" switches LAME has and how
unskillfully the defaults are set in the gstreamer plugin, it is very
unlikely to find a gstreamer command line that works as intended and
will pass rigorous listening tests. The issues with the above command-
lines perfectly illustrate my point. The only way to fix the problem is
at code level, and posting command-lines will just distract from this.

-- 
Sound Juicer - MP3 quality doesn't change
https://bugs.launchpad.net/bugs/195483
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