VBR (Variable bitrate) allows a higher bitrate to be allocated to the more complex segments of media files while less space is allocated to less complex segments. If you choose CBR (Constant bitrate), you will get the constant bitrate.
If I want 10000 Kbps I have no clue what quality value I have to use
The quality is variable depending on the recording target.
=> Please see viewtopic.php?f=10&t=2043