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ISM1 core coder selection issue @ 13.2 kbps

Basic info

  • Float reference:
    • Encoder (float): 6432cc34 (Wed Feb 5 13:17:10 2025)
    • Decoder (float): 6432cc34 (Wed Feb 5 13:17:10 2025)
  • Fixed point:
    • Encoder (fixed): 20250131_Ittiam_fixed_point_encoder_release

Bug description

Distortion, likely due to an unfavourable mode being selected in the core coder. In the test item test1.wav, the below command lines gives a warbling/musical noise distortion around 9 - 10.8 seconds.

Float

image

BASOP

image

A similar distortion can be seen for the item test2.wav, e.g. around 9 - 9.2 seconds.

Float

image

BASOP

image

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-xxxx

../IVAS_cod_ref -ism 1 NULL 13200 48 test1.wav bit.192
../IVAS_dec_ref EXT 48 bit.192 ref1.wav

../IVAS_cod -ism 1 NULL 13200 48 test1.wav bit.192
../IVAS_dec_ref EXT 48 bit.192 out1.wav