[FFmpeg-devel] ebur128 bounty

[Niklas Haas]

On Thu, 12 Jun 2025 16:49:34 +0200 Guillaume Khayat <gkhayat at spectre-music.com> wrote:
> Hello,
>
> The small company I work at uses ebur128 filter.
>
> I’m offering a bounty to improve the filter’s performance on x86 machines.
>
> I’m offering 800 EUR per 10% gain from current baseline, up to 50%/4000 EUR.
>
> I’m aware of 2 recent, promising initiatives to improve performance:
> - our own incomplete attempt using SIMD instructions (-17%): https://ffmpeg.org/pipermail/ffmpeg-devel/2025-April/342383.html
> - Paul Mahol’s recent work in his fork (-20-25%)
>
> Notes:
> - Solution should of course remain EBU R128 compliant (see EBU Loudness Test Set [1], EBU 3341 [2] and EBU 3342 [3] specs)
> - Solution can use FMA, AVX, AVX2 but not AVX512.
> - Evaluation should be done w/ true peak detection disabled (e.g. "ffmpeg -i ~/test.wav -af ebur128=peak=none:framelog=quiet -f null -“)
> - I can offer a down payment at start of work of 800 EUR as a gesture of good will. Rest of payment on patch merge into ffmpeg + invoice
>
> I tried doing this myself but I lack the skills and proper time to learn them on the job. Always happy to sponsor some OSS work though!

Hi,

I'm happy to take a look at this. To be clear, you are fine with me taking
your existing SIMD code as a starting point?

Out of curiousity, did you try the "loudnorm" filter as well?

>
> Best,
>
> Guillaume
>
> [1]: https://tech.ebu.ch/publications/ebu_loudness_test_set
> [2]: https://tech.ebu.ch/files/live/sites/tech/files/shared/tech/tech3341.pdf
> [3]: https://tech.ebu.ch/files/live/sites/tech/files/shared/tech/tech3342.pdf
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