Below is the case for Fedora ( and possibly arch ), which use faac encoder.
[rem@fc25 ~]$ gst-inspect-1.0 | grep -i aac faac: faac: AAC audio encoder faad: faad: AAC audio decoder ...
[rem@fc25 ~]$ gst-inspect-1.0 faac ... quality : Variable bitrate (VBR) quantizer quality in % flags: readable, writable Integer. Range: 1 - 1000 Default: 100
bitrate : Average Bitrate (ABR) in bits/sec flags: readable, writable Integer. Range: 8000 - 320000 Default: 128000
which supports cbr and vbr, and hence their gstreamer profiles. Refer to below attachments.
Below is the case for Fedora ( and possibly arch ), which use faac encoder.
[rem@fc25 ~]$ gst-inspect-1.0 | grep -i aac
faac: faac: AAC audio encoder
faad: faad: AAC audio decoder
...
[rem@fc25 ~]$ gst-inspect-1.0 faac
flags: readable, writable
Integer. Range: 1 - 1000 Default: 100
...
quality : Variable bitrate (VBR) quantizer quality in %
bitrate : Average Bitrate (ABR) in bits/sec
flags: readable, writable
Integer. Range: 8000 - 320000 Default: 128000
which supports cbr and vbr, and hence their gstreamer profiles. Refer to below attachments.