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BWE energy bursts for transition frames in LTV for stereo 16.4kbps WB

Basic info

  • Float reference:
    • Encoder (float): v.2.1

Bug description

There are audible clicks for timestamps 0:34.000s and 0:37.760s that seem to be of the same issue:

Screenshot 2025-03-12 at 16.17.01.png

Screenshot 2025-03-12 at 16.17.16.png

These are not present for float and are gone for 32kHz and 48kHz sampling rate cases.

@vaillancour already did some analysis, this is a transition from ACEPL to TCX, the core is the same as float for both cases but there is this burst in the BWE region.

Ways to reproduce

./IVAS_cod -stereo 16400 16 ltv16_STEREO.wav bit