Comment 4 for bug 1594043

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.