The Constant Bitrate (CBR), expressed in bits per second (bps), used for AAC+ format.
This property is used only if the EncodeFormats.FormatToUse property is set to ENCODING_FORMAT_AAC_PLUS.
This property is the same as entering either the --bitrate <n> and --bitrate-mode 0 setting inside the Appendix F - FdkAac command line
For further details about encoding in AAC+ refer to the AACPlus object section.
For further information about available encoding formats see the EncodeFormats object.