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Instability in stereo synthesis at 48 kbps

At 48 kbps stereo, with the following bitstream, the left channel shows some instabilities.

ltv_STEREO_32k_-stereo_48000_32.zip

image

As shown above, it happens at frame 8675.

On the figure, in order from top to bottom:

  • Right channel floating point
  • Right channel fixed point
  • difference between float and fixed point
  • Core right channel

decoder command line :

IVAS_dec STEREO 32 bit syn

this has been observed with 40400bd0

tagging @fotopoulou and @kiene