Stereo dft collapsing at 16.4 kbps

Basic info

• Commit SHA: c6bae996
• Platform: windows

Bug description

For a file encoded at 16.4 kbps, the floating point codec synthesis is collapsing (fxd encoder and float decoder seems ok) .

from top to bottom:

• spectrogram of the floating point codec (left channel)
• spectrogram of the fixed point encoder and floating point decoder (left channel)
• spectrogram of the original (left channel)

Ways to reproduce

input file located in box : ...\issues\float-issue-1283

IVAS_cod -stereo  16400 48 am1aa1s12.wav bit.flt
IVAS_dec STEREO 48 bit.flt out.fltflt