Stereo@13.2kbps: Command line limited BW differs from bitrate limited BW

Basic info

Commit SHA: ccef3d57

Platform: Windows (Visual Studio 2017)

Bug description

The encoded bitstream is different if you limit to SWB or if it is limited to SWB due to bit rate. This is observed for stereo @ 13.2 kbps, but it may happen at other operating points.

Ways to reproduce

IVAS_cod.exe -max_band SWB -stereo 13200 48 stvST48c.pcm bitSWB

IVAS_cod.exe -max_band FB -stereo 13200 48 stvST48c.pcm bitFB

IVAS_cod.exe -stereo 13200 48 stvST48c.pcm bitFB2

The bitstreams where the encoder limits the encoded bandwidth (bitFB and bitFB2) are bit exact. However, when limiting the bandwidth on the command line with "-max_band SWB", the bitstream is different. I.e. bitSWB differs from bitFB.