#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 |
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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
> -vn tmp.aac
>
> 5. Run command ffmpeg-4.4.1 -y -i sample4.aac -strict strict -b:a 128000
> -vn 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 speed is
degraded
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Ticket URL: <https://trac.ffmpeg.org/ticket/10521#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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