Stock Debian trixie ships FFmpeg 7.1 (libavcodec.so.61), our fork
ships FFmpeg 8.1 (libavcodec.so.62) — different SONAMEs, NOT a
drop-in for trixie's libavcodec61-consuming desktop. Previous
Conflicts: libavcodec61, libavformat61, ... triggered apt to remove
~50 packages (kde-plasma-desktop, vlc, dolphin, ...) when a user
just wanted ffmpeg-v4l2-request-fourier installed alongside.
This commit:
1. ffmpeg-v4l2-request-fourier (pkgrel=2):
- --prefix=/opt/fourier (instead of /usr)
- --extra-ldexeflags / --extra-ldsoflags: -Wl,-rpath,/opt/fourier/lib
so /opt/fourier/bin/ffmpeg finds its own libs without external help
- Ship /etc/ld.so.conf.d/fourier.conf with /opt/fourier/lib + ldconfig
in postinst/postrm. dlopen-by-SONAME consumers (firefox, daedalus)
find libavcodec.so.62 via ld.so cache without LD_LIBRARY_PATH.
- Drop ALL Conflicts/Replaces/Provides for libav* / libpostproc /
libsw* — no SONAME clash with stock libavcodec61, no reason to
evict anything.
- /usr/bin/ffmpeg-fourier + ffprobe-fourier convenience symlinks.
2. daedalus-v4l2 (pkgrel=2):
- Depends: ffmpeg-v4l2-request-fourier (>= 2:8.1+rfourier)
instead of stock 'ffmpeg (>= 7.1)'. The daedalus binary was
linked against libavcodec.so.62 at build time (CI runner had
marfrit/ffmpeg-v4l2-request-fourier installed); at runtime it
needs the .so.62 that only the fourier pkg provides.
Not touched:
- libva-v4l2-request-fourier: ships only v4l2_request_drv_video.so
at /usr/lib/<triplet>/dri/ which libva dlopens by file pattern.
Path A would break the lookup unless every consumer launcher sets
LIBVA_DRIVERS_PATH. Driver name is unique; no conflict. STAY.
- mpv-fourier: Depends already correctly bound to fourier ffmpeg.
Will receive libavcodec.so.62 via the ld.so.cache mechanism
above without recipe changes.
Bumps all 4 daedalus packages (arch + debian × userspace + dkms)
to pick up daedalus-v4l2 f55b2cd: "kernel: media_request_get/put
around inf->req (UAF safety)".
Closes the SHIP-WITH-EYES-OPEN concern Sonnet flagged in the
pre-deployment review — without explicit media_request_get on
capture + media_request_put on completion, a concurrent
MEDIA_IOC_REQUEST_REINIT or process-kill triggering
buf_request_complete from the cancel path could drop vb2's
reference before our completion handler ran, leaving inf->req
dangling through v4l2_ctrl_request_complete + buf_done.
Matches the cedrus / rkvdec refcount pattern. No protocol
change, no API change, no consumer-side adjustment required.
Same byte-exact output verified on hertz post-fix (libva path:
match; standalone test_m2m_stream: 30/30 frames).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Mirror of arch/daedalus-v4l2 into the Debian tree. Same pin
(f04d700, Phase 8.13 close), same install layout. Output as
arm64 .deb.
Build path: CMake for daemon (build via ninja); in-tree Makefile
for tools. No debhelper; standalone dpkg-deb so it builds on
the non-Debian runner.
Depends on ffmpeg (libavformat/libavcodec/libavutil 7.1+) at
runtime, libdrm2. Recommends daedalus-v4l2-dkms (the kernel
module).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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