[FFmpeg-trac] #10521(undetermined:new): ACC encoder speed degradation in version 5.x.x and above

[FFmpeg]

#10521: ACC encoder speed degradation in version 5.x.x and above
-------------------------------------+-------------------------------------
             Reporter:  Vexs         |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:               |               Resolution:
             Keywords:  aac speed    |               Blocked By:
  performance                        |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by Vexs:

Old description:

> Summary of the bug:
>
> AAC encoder speed is degraded in version 5.x and above
>
> How to reproduce:
>
> 1. Download test aac file
> https://filesamples.com/samples/audio/aac/sample4.aac
>
> 2. Download ffmpeg version 4.4.1 from
> https://www.johnvansickle.com/ffmpeg/old-releases/ or compile from branch
> https://github.com/FFmpeg/FFmpeg/tree/release/4.4
>
> 3. Download ffmpeg version 5.1.1 from
> https://www.johnvansickle.com/ffmpeg/old-releases/ or compile from branch
> https://github.com/FFmpeg/FFmpeg/tree/release/5.1
>
> 4. Run command ffmpeg-5.1.1 -y -i sample4.aac -strict strict -b:a 128000
> tmp.aac
>
> 5. Run command ffmpeg-4.4.1 -y -i sample4.aac -strict strict -b:a 128000
> tmp.aac
>
> 6. Compare speed 5.1.1 speed=~26.5x vs 4.4.1 speed=~79.9x
>
> Additional informations:
>
> 1. It seems that only the aac format has this problem. Another audio
> codecs encoding speed is ok
>
> 2. This only applies to encoding. AAC decoding speed looks ok
>
> 3. In all 4.x.x version encoding speed is ok. Starting from 5.x speed is
> degraded

New description:

 Summary of the bug:

 AAC encoder speed is degraded in version 5.x and above

 How to reproduce:

 1. Download test aac file
 https://filesamples.com/samples/audio/aac/sample4.aac

 2. Download ffmpeg version 4.4.1 from https://www.johnvansickle.com/ffmpeg
 /old-releases/ or compile from branch
 https://github.com/FFmpeg/FFmpeg/tree/release/4.4

 3. Download ffmpeg version 5.1.1 from https://www.johnvansickle.com/ffmpeg
 /old-releases/ or compile from branch
 https://github.com/FFmpeg/FFmpeg/tree/release/5.1

 4. Run command ffmpeg-5.1.1 -y -i sample4.aac -strict strict -b:a 128000
 tmp.aac

 5. Run command ffmpeg-4.4.1 -y -i sample4.aac -strict strict -b:a 128000
 tmp.aac

 6. Compare speed 5.1.1 speed=~26.5x vs 4.4.1 speed=~79.9x

 Additional informations:

 1. It seems that only the aac format has this problem. Another audio
 codecs encoding speed is ok

 2. This only applies to encoding. AAC decoding speed looks ok

 3. In all 4.x.x version encoding speed is ok. Starting from 5.x.x speed is
 degraded

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Ticket URL: <https://trac.ffmpeg.org/ticket/10521#comment:2>
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