diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 88493527b..4838c0cbb 100644
--- a/.gitea/workflows/build.yml
+++ b/.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
diff --git a/arch/mpv-fourier/PKGBUILD b/arch/mpv-fourier/PKGBUILD
index 3828f8a1c..0f8eca282 100644
--- a/arch/mpv-fourier/PKGBUILD
+++ b/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