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Discontinuities when switching from TCX to ACELP at 32 bkps stereo

With this bitstream and 40400bd0, we can see (and hear) some discontinuities when switching from TCX to ACELP

stvST32c_-stereo_32000_32.bit

image

On the figure above, in order from top to bottom:

  • Float left channel,
  • Float right channel
  • Fixed point left channel
  • Fixed point right channel
  • Left difference
  • Right difference
  • Selected core

This segment is coded with DFT stereo. We can also observe a ripple effect for the 2 next frames.

Decoder command line : IVAS_dec STEREO 32 bit syn