capture: custom FFmpeg 7.1 build with DeckLink + D-Bus mounts + SDI deinterlace

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.

.gitignore

@@ -23,3 +23,12 @@ services/editor/node_modules
 services/editor/**/node_modules
 services/editor/**/dist
 services/editor/.pnpm-store
+
+# Blackmagic DeckLink SDK + runtime libs (operator-supplied; see services/capture/build-with-decklink.sh)
+services/capture/sdk/
+services/capture/lib/
+
+# Editor backups
+*.bak
+*.bak2
+.env.bak.*

docker-compose.yml

@@ -35,6 +35,9 @@ services:
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
       - /mnt/NVME/MAM/wild-dragon-live:/live
+      - /dev/shm:/dev/shm
+      - /run/dbus:/run/dbus
+      - /run/systemd:/run/systemd
       - /usr/bin/nvidia-smi:/usr/bin/nvidia-smi:ro
     environment:
       DATABASE_URL: ${DATABASE_URL}
@@ -77,6 +80,9 @@ services:
       MAM_API_URL: ${MAM_API_URL:-http://mam-api:3000}
     volumes:
       - /mnt/NVME/MAM/wild-dragon-live:/live
+      - /dev/shm:/dev/shm
+      - /run/dbus:/run/dbus
+      - /run/systemd:/run/systemd
     networks:
       - wild-dragon
 
@@ -102,6 +108,9 @@ services:
       - "${PORT_WEB_UI:-7434}:80"
     volumes:
       - /mnt/NVME/MAM/wild-dragon-live:/live
+      - /dev/shm:/dev/shm
+      - /run/dbus:/run/dbus
+      - /run/systemd:/run/systemd
     networks:
       - wild-dragon
 

services/capture/Dockerfile

@@ -1,8 +1,66 @@
+# ── Stage 1: Build FFmpeg with DeckLink support ─────────────────────────────
+FROM debian:bookworm AS ffmpeg-builder
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential nasm yasm pkg-config git ca-certificates python3 \
+    libssl-dev libx264-dev libx265-dev libvpx-dev libopus-dev \
+    libmp3lame-dev libsrt-openssl-dev \
+    libzmq3-dev zlib1g-dev libstdc++-12-dev \
+  && rm -rf /var/lib/apt/lists/*
+
+# Copy in BMD DeckLink SDK headers and patch script
+COPY sdk/ /decklink-sdk/
+COPY patch_decklink.py /patch_decklink.py
+
+# Pull FFmpeg 7.1 source
+RUN git clone --depth=1 --branch release/7.1 https://git.ffmpeg.org/ffmpeg.git /ffmpeg
+
+# Patch FFmpeg DeckLink code for SDK 16.x API changes
+RUN python3 /patch_decklink.py
+
+WORKDIR /ffmpeg
+RUN ./configure \
+      --prefix=/usr/local \
+      --enable-gpl \
+      --enable-nonfree \
+      --enable-libx264 \
+      --enable-libx265 \
+      --enable-libvpx \
+      --enable-libopus \
+      --enable-libmp3lame \
+      --enable-libsrt \
+      --enable-libzmq \
+      --enable-decklink \
+      --extra-cflags="-I/decklink-sdk" \
+      --disable-doc \
+      --disable-debug \
+      --disable-ffplay \
+  && make -j$(nproc) \
+  && make install
+
+# ── Stage 2: Runtime image ───────────────────────────────────────────────────
 FROM node:20-bookworm
-RUN apt-get update && apt-get install -y ffmpeg && rm -rf /var/lib/apt/lists/*
+
+# Runtime deps for compiled ffmpeg libs
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libx264-164 libx265-199 libvpx7 libopus0 libmp3lame0 \
+    libsrt1.5-openssl libzmq5 libstdc++6 libc++1 libc++abi1 \
+  && rm -rf /var/lib/apt/lists/*
+
+# Copy compiled ffmpeg/ffprobe
+COPY --from=ffmpeg-builder /usr/local/bin/ffmpeg  /usr/local/bin/ffmpeg
+COPY --from=ffmpeg-builder /usr/local/bin/ffprobe /usr/local/bin/ffprobe
+COPY --from=ffmpeg-builder /usr/local/lib/        /usr/local/lib/
+
+# DeckLink runtime .so
+COPY lib/libDeckLinkAPI.so        /usr/lib/libDeckLinkAPI.so
+COPY lib/libDeckLinkPreviewAPI.so /usr/lib/libDeckLinkPreviewAPI.so
+RUN ldconfig
+
 WORKDIR /app
 COPY package*.json ./
 RUN npm install --omit=dev
 COPY . .
+
 EXPOSE 3001
 CMD ["node", "src/index.js"]

services/capture/build-with-decklink.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$0")"
+
+echo "=== Checking prerequisites ==="
+
+if [ ! -f sdk/DeckLinkAPI.h ]; then
+  echo "ERROR: sdk/DeckLinkAPI.h not found."
+  echo ""
+  echo "Please download the Blackmagic DeckLink SDK 16.x from:"
+  echo "  https://www.blackmagicdesign.com/developer/product/capture"
+  echo ""
+  echo "Then extract the Linux/include/ folder contents into:"
+  echo "  $(pwd)/sdk/"
+  echo ""
+  echo "Required files: DeckLinkAPI.h DeckLinkAPIVersion.h DeckLinkAPIDispatch.cpp"
+  echo "                LinuxCOM.h DeckLinkAPIModes.h DeckLinkAPITypes.h"
+  exit 1
+fi
+
+echo "SDK headers found:"
+ls sdk/*.h sdk/*.cpp 2>/dev/null
+
+echo ""
+echo "=== Building capture container with DeckLink FFmpeg ==="
+docker compose -f ../../docker-compose.yml build capture
+
+echo ""
+echo "=== Verifying DeckLink support in built image ==="
+docker run --rm wild-dragon-capture ffmpeg -f decklink -list_devices true -i dummy 2>&1 | head -20

services/capture/patch_decklink.py

@@ -0,0 +1,51 @@
+import re
+
+dec_path = '/ffmpeg/libavdevice/decklink_dec.cpp'
+
+with open(dec_path) as f:
+    content = f.read()
+
+# Fix 1: IDeckLinkMemoryAllocator -> IDeckLinkMemoryAllocator_v14_2_1
+# SDK 16 removed the unversioned alias
+for old, new in [
+    (': public IDeckLinkMemoryAllocator\n', ': public IDeckLinkMemoryAllocator_v14_2_1\n'),
+    ('IDeckLinkMemoryAllocator *', 'IDeckLinkMemoryAllocator_v14_2_1 *'),
+    ('IDeckLinkMemoryAllocator*', 'IDeckLinkMemoryAllocator_v14_2_1*'),
+]:
+    content = content.replace(old, new)
+print('Fix 1: IDeckLinkMemoryAllocator renamed')
+
+# Fix 2: SetVideoInputFrameMemoryAllocator removed from IDeckLinkInput in SDK 16
+content = re.sub(
+    r'ret = \(ctx->dli->SetVideoInputFrameMemoryAllocator\(allocator\)[^;]*;',
+    'ret = 0; /* SDK16: SetVideoInputFrameMemoryAllocator removed */',
+    content
+)
+print('Fix 2: SetVideoInputFrameMemoryAllocator patched')
+
+# Fix 3: IDeckLinkVideoFrame::GetBytes removed in SDK 16 - moved to IDeckLinkVideoBuffer
+# Replace: videoFrame->GetBytes(&frameBytes);
+# With: { IDeckLinkVideoBuffer *vbuf = nullptr; videoFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&vbuf); if (vbuf) { vbuf->GetBytes(&frameBytes); vbuf->Release(); } }
+getbytes_replacement = (
+    '{ IDeckLinkVideoBuffer *_vbuf = nullptr; '
+    'videoFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&_vbuf); '
+    'if (_vbuf) { _vbuf->GetBytes(&frameBytes); _vbuf->Release(); } }'
+)
+content = content.replace(
+    'videoFrame->GetBytes(&frameBytes);',
+    getbytes_replacement + ';'
+)
+print('Fix 3: videoFrame->GetBytes replaced with QueryInterface(IDeckLinkVideoBuffer)')
+
+# Fix 4: Add include for versioned allocator header
+if 'DeckLinkAPIMemoryAllocator_v14_2_1.h' not in content:
+    content = content.replace(
+        '#include "decklink_common.h"',
+        '#include "decklink_common.h"\n#include "DeckLinkAPIMemoryAllocator_v14_2_1.h"'
+    )
+    print('Fix 4: DeckLinkAPIMemoryAllocator_v14_2_1.h include added')
+
+with open(dec_path, 'w') as f:
+    f.write(content)
+
+print('All patches applied successfully')

services/capture/src/capture-manager.js

@@ -213,8 +213,11 @@ class CaptureManager {
 
     console.log('[capture] hires ffmpeg args:', hiresCodecArgs.join(' '));
 
+    const sdiFilterArgs = (sourceType === 'sdi') ? ['-vf', 'yadif=mode=1'] : [];
+
     const hiresProcess = spawn('ffmpeg', [
       ...inputArgs,
+      ...sdiFilterArgs,
       ...hiresCodecArgs,
       'pipe:1',
     ], { stdio: ['ignore', 'pipe', 'pipe'] });
@@ -286,6 +289,7 @@ class CaptureManager {
 
       const proxyProcess = spawn('ffmpeg', [
         ...inputArgs,
+        ...sdiFilterArgs,
         ...proxyCodecArgs,
         '-movflags', '+frag_keyframe+empty_moov',
         'pipe:1',

services/web-ui/public/recorders.html

@@ -386,9 +386,9 @@
     <div class="form-group">
       <label class="form-label">Source type</label>
       <div class="source-type-row">
-        <button class="source-type-btn active" data-type="srt" onclick="setSourceType('srt')">SRT</button>
+        <button class="source-type-btn" data-type="srt" onclick="setSourceType('srt')">SRT</button>
         <button class="source-type-btn" data-type="rtmp" onclick="setSourceType('rtmp')">RTMP</button>
-        <button class="source-type-btn" data-type="sdi" onclick="setSourceType('sdi')">SDI</button>
+        <button class="source-type-btn active" data-type="sdi" onclick="setSourceType('sdi')">SDI</button>
       </div>
     </div>
 
@@ -662,7 +662,7 @@
   const PROXY_DEFAULT_CONTAINER = 'mp4';
 
   const pState = {
-    recorders: [], timers: {}, sourceType: 'srt', mode: 'caller',
+    recorders: [], timers: {}, sourceType: 'sdi', mode: 'caller',
     projects: [], signals: {}, editingId: null,
     // SDI picker state
     bmdDevices: [],         // flat list from /cluster/devices/blackmagic
@@ -1068,10 +1068,10 @@
     const pr = document.getElementById('probeResult');
     if (pr) pr.remove();
 
-    pState.sourceType = 'srt';
+    pState.sourceType = 'sdi';
     pState.selectedNodeId = null;
     pState.selectedDeviceIndex = null;
-    document.querySelectorAll('.source-type-btn').forEach(b => b.classList.toggle('active', b.dataset.type === 'srt'));
+    document.querySelectorAll('.source-type-btn').forEach(b => b.classList.toggle('active', b.dataset.type === 'sdi'));
     // Make sure tabs are on Video
     document.querySelectorAll('.codec-tabs').forEach(tabs => {
       tabs.querySelectorAll('.codec-tab').forEach(b => b.classList.toggle('active', b.dataset.tab === 'video'));