Zac Gaetano
30b4deffc6
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.
67 lines
2.3 KiB
Docker
67 lines
2.3 KiB
Docker
# ── Stage 1: Build FFmpeg with DeckLink support ─────────────────────────────
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FROM debian:bookworm AS ffmpeg-builder
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RUN apt-get update && apt-get install -y --no-install-recommends \
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build-essential nasm yasm pkg-config git ca-certificates python3 \
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libssl-dev libx264-dev libx265-dev libvpx-dev libopus-dev \
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libmp3lame-dev libsrt-openssl-dev \
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libzmq3-dev zlib1g-dev libstdc++-12-dev \
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&& rm -rf /var/lib/apt/lists/*
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# Copy in BMD DeckLink SDK headers and patch script
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COPY sdk/ /decklink-sdk/
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COPY patch_decklink.py /patch_decklink.py
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COPY decklink-sdk16.patch /decklink-sdk16.patch
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# Pull FFmpeg 7.1 source
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RUN git clone --depth=1 --branch release/7.1 https://git.ffmpeg.org/ffmpeg.git /ffmpeg
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# Patch FFmpeg DeckLink code for SDK 16.x API changes
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RUN python3 /patch_decklink.py
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WORKDIR /ffmpeg
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RUN ./configure \
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--prefix=/usr/local \
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--enable-gpl \
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--enable-nonfree \
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--enable-libx264 \
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--enable-libx265 \
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--enable-libvpx \
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--enable-libopus \
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--enable-libmp3lame \
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--enable-libsrt \
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--enable-libzmq \
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--enable-decklink \
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--extra-cflags="-I/decklink-sdk" \
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--disable-doc \
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--disable-debug \
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--disable-ffplay \
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&& make -j$(nproc) \
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&& make install
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# ── Stage 2: Runtime image ───────────────────────────────────────────────────
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FROM node:20-bookworm
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# Runtime deps for compiled ffmpeg libs
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RUN apt-get update && apt-get install -y --no-install-recommends \
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libx264-164 libx265-199 libvpx7 libopus0 libmp3lame0 \
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libsrt1.5-openssl libzmq5 libstdc++6 libc++1 libc++abi1 \
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&& rm -rf /var/lib/apt/lists/*
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# Copy compiled ffmpeg/ffprobe
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COPY --from=ffmpeg-builder /usr/local/bin/ffmpeg /usr/local/bin/ffmpeg
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COPY --from=ffmpeg-builder /usr/local/bin/ffprobe /usr/local/bin/ffprobe
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COPY --from=ffmpeg-builder /usr/local/lib/ /usr/local/lib/
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# DeckLink runtime .so
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COPY lib/libDeckLinkAPI.so /usr/lib/libDeckLinkAPI.so
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COPY lib/libDeckLinkPreviewAPI.so /usr/lib/libDeckLinkPreviewAPI.so
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RUN ldconfig
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WORKDIR /app
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COPY package*.json ./
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RUN npm install --omit=dev
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COPY . .
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EXPOSE 3001
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CMD ["node", "src/index.js"]
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