[FFmpeg-devel] ebur128 bounty

[Guillaume Khayat <gkhayat@spectre-music.com>]

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!

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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