The custom FFmpeg 7.1 in this image previously had NO nvenc — only
prores_ks/dnxhd/libx264/libx265. The All-Intra HEVC ingest plan
(docs/design/2026-05-29-all-intra-hevc-ingest.md §4.1) needs
hevc_nvenc / h264_nvenc to offload the per-signal encode from CPU
to the L4, so we rebuild ffmpeg's configure stage with:
--enable-ffnvcodec --enable-nvenc --enable-cuvid
nv-codec-headers (pinned n12.1.14.0) is cloned + installed before
configure so ffmpeg picks up the ffnvcodec pkg-config. Full CUDA
toolkit is omitted — only needed for GPU filters like yadif_cuda.
Adds a sanity-check RUN that fails the build if hevc_nvenc/h264_nvenc
don't appear in 'ffmpeg -encoders' so a broken NVENC build can't
silently ship. Creates /live and /growing as empty dirs since the
node-agent binds them at sidecar start.
The previous patch_decklink.py mixed v14_2_1 versioned types (Fix 1 renamed the allocator class) with no-ops for SetVideoInputFrameMemoryAllocator + QueryInterface-around-GetBytes (Fixes 2 & 3). That inconsistency compiled but silently dropped every video frame: VideoInputFrameArrived saw _v14_2_1 allocator output but tried to read it via the SDK 16 unversioned IDeckLinkVideoBuffer path, and the SDK released the buffer before FFmpeg could consume it.
Bisected with the BMD-provided Capture sample at SDK 16 mode 5 (Hp29) which got frames cleanly, confirming the signal was fine and the bug was in FFmpegs decklink demuxer.
Fix: pull libavdevice/decklink_{enc,dec,common}{.cpp,.h} from upstream FFmpeg master (commits past 7.1 that fully rename every decklink interface to its _v14_2_1 versioned form) and apply that diff in reverse during build. Now build is internally consistent and frames flow.
Verified: SDI1 recorder on zampp2 hits 423 frames in 14s @ 29 fps, ProRes HQ at 91 Mbps.
Dockerfile is now a two-stage build that compiles FFmpeg from source with --enable-decklink against the Blackmagic SDK 16.x headers in services/capture/sdk/ (operator-supplied, gitignored). build-with-decklink.sh + patch_decklink.py drive the build.
docker-compose.yml mounts /dev/shm, /run/dbus, /run/systemd into mam-api, capture, web-ui so the BMD runtime can talk to the host.
capture-manager.js wraps SDI sources with -vf yadif=mode=1 (deinterlace).
recorders.html defaults to SDI source type now that we have a working DeckLink path.
