[FFmpeg-trac] #7488(undetermined:new): CRF value not working when encoding with libaom in AV1 (2)

[FFmpeg]

#7488: CRF value not working when encoding with libaom in AV1 (2)
-------------------------------------+-------------------------------------
             Reporter:  Ewout        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  libaom,      |               Blocked By:
  av1, crf                           |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Excuse me for reporting inconclusive data in my first ticket (#7483).

 Summary of the bug: CRF value not working when encoding with libaom in AV1
 How to reproduce:
 {{{
 ffmpeg -i C:\Morocco8khdr60fps-1280.m4v -c:v libaom-av1 -crf 6 -strict
 experimental av1_test_Morocco8K_1280crf6.mkv
 ffmpeg -i C:\Morocco8khdr60fps-1280.m4v -c:v libaom-av1 -crf 12 -strict
 experimental av1_test_Morocco8K_1280crf12.mkv
 ffmpeg -i C:\Morocco8khdr60fps-1280.m4v -c:v libaom-av1 -crf 18 -strict
 experimental av1_test_Morocco8K_1280crf18.mkv
 ffmpeg -i C:\Morocco8khdr60fps-1280.m4v -c:v libaom-av1 -crf 24 -strict
 experimental av1_test_Morocco8K_1280crf24.mkv
 }}}

 '''ffmpeg version:''' ffmpeg-20181007-0a41a8b-win64-static
 '''built on:''' Windows 10 64-bit (1809)

 I encoded a high-bitrate m4v file (encoded with x264) to AV1 with
 different CRF values. All came out with the same bitrates. See the
 attached screenshots. Files can be found here:
 https://drive.google.com/file/d/1e4QmCXavsJqxzI4OOS5jqfMmSSmGPD4B/view?usp=sharing

 The input file was 16 MB, around 1 MB/s. With CRF values of 6, 12, 18 and
 24 they all encoded to the same 836 kB (855.592 bytes), around 52 kB/s.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7488>
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