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Discontinuities when switching from 16.4 kbps DFT-stereo to 80 kbps MDCT stereo

with 04440bc5, we can see and hear a discontinuity when switching from 16.4kbps to 80 kbps

On the figure below from top to bottom:

  • element bitrate
  • spectrogram of the right channel (float)
  • spectrogram of the right channel (fixed point)
  • spectrum (green is float, purple is fixed point)

image

The problem can be heard on the left channel as well, but to a less extend

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