[FFmpeg-trac] #9727(avcodec:new): AAC_AT: broken VBR / missing VBR handle

[FFmpeg]

#9727: AAC_AT: broken VBR / missing VBR handle
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             Reporter:  mcccs    |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  unspecified
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 aac_at needs to accept "-vbr" threshold-specifier to work in VBR mode.

 For example, "ffmpeg -h encoder=libfdk_aac" shows the arg "-vbr <int> VBR
 mode (1-5)"

 However "ffmpeg -h encoder=aac_at" shows no such argument for VBR AAC
 using AAC_AT (it's not only "-h" page missing, "-vbr <int> doesn't work")

 Moreover, files currently produced with "-c:a aac_at -aac_at_mode 3"
 produce CBR instead of VBR.

 So simple AAC_AT completely lacks modes 2 (VBR + Cap) and 3 (VBR)
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Ticket URL: <https://trac.ffmpeg.org/ticket/9727>
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