OK so, there is an existing package.yml pspec etc in that git repo: https://git.solus-project.com/packages/kodi/
Not entirely sure if this should be against that package.. feel it should be.

- pkgconfig(libavformat) 
- pkgconfig(libavfilter) 
- pkgconfig(libavcodec)
- pkgconfig(libavutil) 
- pkgconfig(libavresample) 
- pkgconfig(libswresample)
- pkgconfig(libswscale) 
- pkgconfig(libpostproc) 
- pkgconfig(libavdevice)

These are all in the same package, ffmpeg-devel. Best to just use a single pkgconfig(libavformat) here to to speed up dependency resolution of the builds.

More dupes:

- pkgconfig(libva)
- pkgconfig(libva-x11)

And the final change we need, is to clear up all the trailing whitespace in the patch, you'll see it marked red in git show:

 ✘ ikey@solus-bdw  ~/Solus/kodi   master  git am 0001-Initial-Commit.patch 
Applying: Initial Commit
.git/rebase-apply/patch:19: trailing whitespace.
license    : GPL-2.0 
.git/rebase-apply/patch:59: trailing whitespace.
    - pkgconfig(libavformat) 
.git/rebase-apply/patch:60: trailing whitespace.
    - pkgconfig(libavfilter) 
.git/rebase-apply/patch:62: trailing whitespace.
    - pkgconfig(libavutil) 
.git/rebase-apply/patch:63: trailing whitespace.
    - pkgconfig(libavresample) 
warning: squelched 3 whitespace errors
warning: 8 lines add whitespace errors

Great start though, super impressed =)

Sorry about that, I'll clone and make the changes from that, and fix the whitespace!

Don't be sorry - all part of the process :D Really appreciate you stepping up like this and improving Solus - means a lot to all of us

How's this look:

Good to hear! Glad I could help, and I've said it already but thanks again for your help through this tougher patch, I would've been totally lost otherwise.