[ltv-regression] Significant MLD increase for ltv_basop_encoder-MASA 2TC at 128 kbps, 48kHz in, 48kHz out, FOA out

Basic info

Old version

• Float:
  • Encoder (float): 24152d66f
  • Decoder (float): 24152d66f
• Fixed point:
  • Encoder (fixed): 26ae1a66

New version

• Float:
  • Encoder (float): aa956cc5e
  • Decoder (float): aa956cc5e
• Fixed point:
  • Encoder (fixed): 06072653

Bug description

Daily LTV run shows MLD increase from 6.3 to 31.2 for one MASA test case, namely ltv_basop_encoder-MASA 2TC at 128 kbps, 48kHz in, 48kHz out, FOA out. Further inspection confirms that this comes from the switch FIX_BASOP_2529_MASA_RATIO_SCALINGS in MR !2942 (merged).

As the fix itself is necessary, it is possible that the change in parameter values has caused issues further in the flow. This needs to be inspected.

Ways to reproduce

Use this with various encoder and decoder versions.

./IVAS_cod -masa 2 ltv48_MASA2TC.met 128000 48 ltv48_MASA2TC.wav debug.bit
./IVAS_dec FOA 48 debug.bit out.wav