AudioX (https://huggingface.co/spaces/Zeyue7/AudioX) generates sounds and music from an instruction and can link them to a video.
Sounds and 10-second video clip, fine adjustments.
A few random generations disappear once the instruction is reformulated.

Export wav and mp4.

Open source, Github documentation: https://zeyuet.github.io/AudioX/

Sound and music tests only:

Tests from free videos from Pexels:

Original video: https://www.pexels.com/fr-fr/video/lynx-buvant-dans-un-etang-reflechissant-29894963

Original video: https://www.pexels.com/fr-fr/video/vue-aerienne-panoramique-d-une-route-rurale-et-de-champs-verdoyants-30647838

Original video: https://www.pexels.com/fr-fr/video/exploration-sous-marine-avec-des-plongeurs-et-des-tortues-de-mer-31365150/

Original video: https://www.pexels.com/fr-fr/video/31531557/