Merge remote-tracking branch 'origin/main' into noether/ffmpeg-fourier-idct4-daedalus

.gitea/workflows/build.yml

@@ -1160,13 +1160,18 @@ jobs:
           retry() { for i in 1 2 3; do "$@" && return 0; rc=$?; echo "retry $i (exit=$rc)" >&2; sleep $((i*5)); done; return 1; }
           export DEBIAN_FRONTEND=noninteractive
           retry apt-get update -qq
-          # libav*-dev provide the headers daedalus daemon dlopens at
-          # runtime — Debian's stock packages match the trixie ABI the
-          # daemon will encounter on Pi 5 hosts (both ship libavcodec
-          # 61.x).  The fourier ffmpeg fork isn't needed here; the
-          # daemon never link-binds against libav (Option γ — dlopen
-          # at runtime), so any header set with the right struct
-          # definitions works.
+          # FFmpeg headers + sonames the daemon dlopens.  As of
+          # daedalus-v4l2 PR #16 (commit 514da29), the daemon targets
+          # the Kwiboo fork's libavcodec.so.62 / libavformat.so.62 /
+          # libavutil.so.60 at /opt/fourier — so the build needs
+          # /opt/fourier/include and /opt/fourier/lib/pkgconfig.
+          # ffmpeg-v4l2-request-fourier provides both (plus the
+          # runtime libs the .deb will dlopen on the target host;
+          # we install it as a build-dep here and the dpkg-shlibdeps
+          # step pulls it into the daemon .deb's Depends automatically).
+          # Debian-stock libav*-dev removed — would conflict on
+          # /usr/include/libavcodec/avcodec.h vs /opt/fourier's copy.
+          #
           # libvulkan-dev + glslang-tools: needed by the in-build
           # daedalus-fourier fetch (build-deb.sh fetches the sibling
           # library, cmake-builds it into a temp prefix, then the
@@ -1177,7 +1182,7 @@ jobs:
           # reauktion/daedalus-v4l2 PR #13.
           retry apt-get install -y --no-install-recommends \
               build-essential cmake ninja-build pkg-config git \
-              libavcodec-dev libavformat-dev libavutil-dev libdrm-dev \
+              ffmpeg-v4l2-request-fourier libdrm-dev \
               libvulkan-dev glslang-tools \
               linux-libc-dev \
               curl ca-certificates openssh-client rsync dpkg-dev