mpv-fourier pkgrel=5: build against marfrit ffmpeg-v4l2-request-fourier

Run #68's mpv-fourier-1:0.41.0-4 fails to start on ohm with libavcodec
ABI mismatch:
  build version 62.28.101 incompatible with runtime version 62.28.100

Build host (fermi) pulls stock arch ffmpeg via makepkg --syncdeps —
that ffmpeg currently ships libavcodec 62.28.101. Consumer host (ohm)
runs marfrit/ffmpeg-v4l2-request-fourier (Kwiboo's fork pinned to
commit b57fbbe, libavcodec 62.28.100). The build/runtime drift
silently aborts mpv at startup before the version banner prints.

Fix: configure [marfrit] on fermi and pre-install our ffmpeg before
makepkg --syncdeps. mpv-fourier PKGBUILD now depends on
ffmpeg-v4l2-request-fourier explicitly (replacing the generic ffmpeg
dep), making the build target unambiguous.

Workflow change: new step in mpv-fourier-aarch64 between "install
deploy ssh key" and "makepkg" — imports the marfrit signing key into
pacman-key, appends [marfrit] block to /etc/pacman.conf if absent,
syncs db, installs marfrit/ffmpeg-v4l2-request-fourier explicitly so
makepkg --syncdeps finds the dep already satisfied via provides=ffmpeg.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -633,6 +633,24 @@ jobs:
           chmod 600 /root/.ssh/id_ed25519
           ssh-keyscan -t ed25519 nc.reauktion.de > /root/.ssh/known_hosts 2>/dev/null
 
+      - name: configure [marfrit] repo + pre-install ffmpeg-v4l2-request-fourier
+        run: |
+          set -e
+          # mpv-fourier links libavcodec at build time. If the build host pulls
+          # stock arch's ffmpeg, the resulting binary's libavcodec ABI version
+          # drifts from the marfrit ffmpeg-v4l2-request-fourier that consumer
+          # hosts (ohm) install. Force build-time consistency by configuring
+          # [marfrit] on fermi and pre-installing our ffmpeg before makepkg.
+          curl -sLo /tmp/marfrit.gpg https://packages.reauktion.de/marfrit.gpg
+          pacman-key --add /tmp/marfrit.gpg
+          pacman-key --lsign-key 92D5E96D8F63C75E4116AA1FF5C8C4603D0D250C
+          rm -f /tmp/marfrit.gpg
+          if ! grep -q '^\[marfrit\]' /etc/pacman.conf; then
+            printf '\n[marfrit]\nServer = https://packages.reauktion.de/arch/$arch\nSigLevel = Required\n' >> /etc/pacman.conf
+          fi
+          pacman -Sy --noconfirm
+          pacman -S --noconfirm marfrit/ffmpeg-v4l2-request-fourier
+
       - name: makepkg mpv-fourier
         run: |
           set -e

arch/mpv-fourier/PKGBUILD

@@ -23,13 +23,13 @@ pkgname=mpv-fourier
 _upstreampkg=mpv
 epoch=1
 pkgver=0.41.0
-pkgrel=4
+pkgrel=5
 pkgdesc='mpv with fourier-umbrella patches (vo_dmabuf_wayland plane-semantics fix slot)'
 arch=('aarch64')
 url='https://mpv.io/'
 license=('GPL-2.0-or-later AND LGPL-2.1-or-later')
 depends=(
-    alsa-lib desktop-file-utils ffmpeg glibc hicolor-icon-theme
+    alsa-lib desktop-file-utils ffmpeg-v4l2-request-fourier glibc hicolor-icon-theme
     jack lcms2 libarchive libass libbluray libcdio
     libcdio-paranoia libdisplay-info libdrm libdvdnav libdvdread libegl libgl
     libglvnd libjpeg-turbo libplacebo libpulse libsixel libva