There is an updated pull request by jnbr against master on the void-packages repository

https://github.com/jnbr/void-packages ffmpeg
https://github.com/void-linux/void-packages/pull/22980

[NOMERGE ]ffmpeg: update to 4.3.


A patch file from https://github.com/void-linux/void-packages/pull/22980.patch is attached