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Bitrate switching quality issue

with 9044ab55 and this bitstream :

ltv_STEREO_48k_sw_13k2_64k.zip

at least between 134 and 143s, we can see the synthesis diverging a lot from the floating point when going from MDCT to DFT

in the figure below, from top to bottom:

  • Element_mode
  • element_brate
  • Left channel float
  • Left channel right
  • Diff
  • Spectrum of the selected part

image

it happens also between 7s and 17s, but many switching don't show this wrong behaviour