#10521: ACC encoder speed degradation in version 5.x.x and above
-------------------------------------+-------------------------------------
Reporter: Vexs | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined |
Keywords: aac speed | Blocked By:
performance |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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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
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Ticket URL: <https://trac.ffmpeg.org/ticket/10521>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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