Freaccmd: Unable to set a higher cbr bitrate than 160

[Flameborn]

Hello,

I am trying to split an m4b based on chapters and convert to CBR, 320 KBPS mp3. Despite what the help file says, the maximum bitrate seems to be 160 via the -b flag. Lower bitrates work as expected, e.g. 128.

I am using Intel MacOS 12.7.6.

Example command:

for f in *.m4b; do
  /applications/freac.app/Contents/MacOS/freaccmd -d "${f%.m4b}_out" --split-chapters -p "<track> <title>" -m cbr -b 320 "$f"
done

Any help is greatly appreciated.