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Bandwidth Detector not working reliably for Music and Generic Audio

The bandwidth detector is not working reliably for music and generic audio content. We are currently assessing the performance at 48 kbit/s Stereo, and are stumbleing across a plethora of items where a malfunctioning of the bandwidth detector is causing (sometimes massive) degradations.

For e.g. the EBU SQAM database (https://tech.ebu.ch/publications/sqamcd), we have detected issues for the following items:

  • 13
  • 22
  • 26
  • 31
  • 35
  • 47
  • 55
  • 56
  • 60
  • 62
  • 66

Examples:

Item 26: Bildschirmfoto_2023-06-02_um_17.36.55 Big portions of signal limited to WB

Item 35: Bildschirmfoto_2023-06-02_um_17.11.46! Various onsets were limited to WB only (audible)

Item 47: Bildschirmfoto_2023-06-02_um_17.19.43! Beginning of singing limited to WB only (audible!)

IVAS is an immersive codec which covers also the high bitrates with a corresponding quality promise. If the BWD is not capable to work in a sufficently reliable manner, it's proposed to deactivate it for the mid- and high bitrates completely.

Edited by multrus