There is a new pull request by Hoshpak against master on the void-packages repository

https://github.com/Hoshpak/void-packages ffmpeg-vaapi-workaround
https://github.com/void-linux/void-packages/pull/22461

ffmpeg: apply workaround for mesa vaapi bug
Works around https://bugs.freedesktop.org/show_bug.cgi?id=105368
which causes segfaults with vaapi with some radeon card.
The patch was written by the kodi developers and sent
upstream in http://ffmpeg.org/pipermail/ffmpeg-devel/2019-March/240862.html .

A patch file from https://github.com/void-linux/void-packages/pull/22461.patch is attached