add mpv-fourier scaffold (delivery vehicle for dmabuf-modifier-triage iter1)

mpv on ohm is currently stock arch from [extra]. To ship the vo_dmabuf_wayland plane-semantics fix per marfrit/dmabuf-modifier-triage#1, we need an mpv-fourier package following the same fourier-umbrella pattern as kwin-fourier, qt6-base-fourier, firefox-fourier, libva-v4l2-request-fourier. This commit lays down: - arch/mpv-fourier/PKGBUILD pinning upstream mpv 0.41.0 tarball, with empty patch slot in prepare(). replaces=mpv. provides=mpv,libmpv.so. When iter1 produces the patch, add it to source=()/sha256sums=() and uncomment the patch -p1 line. - arch/mpv-fourier/README.md documenting why + tracker links - .gitea/workflows/build.yml job mpv-fourier-aarch64 chained after libva-v4l2-request-fourier-aarch64 for marfrit.db serialization. Same fermi LXC runner, same makepkg → sign → repo-add → rsync flow. Initial scaffold builds vanilla mpv 0.41.0 with no fourier patches — once iter1 lands, bump pkgrel and add the patch. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-08 14:48:03 +00:00
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+# mpv-fourier
+
+mpv with the fourier-umbrella patches.
+
+## Why
+
+The dmabuf-modifier-triage campaign isolated the green-frames bug on ohm
+to mpv's `vo_dmabuf_wayland.c` plane-semantics handling for V4L2 stateless
+decoder dmabufs. mpv currently emits a `zwp_linux_buffer_params_v1`
+message that mixes per-plane fds (V4L2 MPLANE export) with a single-
+allocation offset for plane 1, causing KWin to read the UV chroma plane
+past-EOF on the UV-plane fd and render solid dark green.
+
+This package is the delivery vehicle for the fix once it's written.
+PKGBUILD is in place with an empty patch slot; the patch itself is iter1
+of the triage campaign.
+
+## Tracker
+
+- Bug: [marfrit/dmabuf-modifier-triage#1](https://git.reauktion.de/marfrit/dmabuf-modifier-triage/issues/1)
+- Symptom-tracker: [marfrit/libva-multiplanar#1](https://git.reauktion.de/marfrit/libva-multiplanar/issues/1)
+- Acceptance criterion: `~/src/dmabuf-modifier-triage/screenshots/`
+
+## Status
+
+- 2026-05-08: scaffold landed. Builds vanilla mpv 0.41.0 with no
+  fourier patches applied (patch slot empty in `prepare()`). pkgrel=1
+  pinned to mpv release v0.41.0.
+
+When iter1 of the triage campaign produces the patch, bump pkgrel,
+add the patch to `source=()` and `sha256sums=()`, uncomment the
+`patch -p1` line in `prepare()`.
+
+## Hosts that benefit
+
+Only hosts that exercise the V4L2 stateless dmabuf-wayland path —
+ohm (RK3566 + hantro G1) today, fresnel (RK3399 + hantro + rkvdec)
+once that campaign reaches its mpv-test phase. Other hosts on
+[marfrit] (boltzmann, hertz desktop) won't see any difference as
+the fix is no-op for non-V4L2-stateless dmabuf paths.