I have built and tested the resulting package locally with these changes and it seems to work just fine.
I haven't been able to build the ffmpeg-codecs package yet, but I am working on it.
But this splits up the sources and checksums into x86_64 and aarch64 specific ones and adds an aarch64 specific unpack section in prepare() function.
This will also make our aarch64 specific PKGBUILD obsolete.
Signed-off-by: Dan Johansen strit@manjaro.org