ffmpeg-full shall drop the rockchip-mpp from its dependencies, since the latter is ARM-only. The rockchip-mpp package should also be deleted from the AUR repo. I plan to submit requests to effect these.

Please see other similar deletion requests for ARM-only packages, like this one:

[PRQ#44308] Deletion Request for ruffle-arm

https://lists.archlinux.org/hyperkitty/list/aur-requests@lists.archlinux.org/thread/AQDN3OOUW4IUUY43MQ6D2ZIDQVS6ISCM/