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fix(playout): use static ffmpeg, not apt, to avoid CasparCG SIGABRT

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apt-get install ffmpeg pulls in ~80 transitive shared libs (libav*,
libx264, libdrm, libva...) that perturb CasparCG 2.4.0's headless
runtime linking and make it abort with SIGABRT (exit 134) on almost
every launch. Replace it with john van sickle's self-contained static
ffmpeg/ffprobe binaries in /usr/local/bin — the standalone CLI the HLS
re-muxer needs, with zero new shared libraries, keeping CasparCG's
environment identical to the known-good image.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Zac Gaetano 2026-05-31 14:18:56 -04:00
parent abfbd034ab
commit 869ae1aa83
1 changed files with 24 additions and 5 deletions
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29
services/playout/Dockerfile
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@ -26,12 +26,17 @@ ARG NDI_SDK_URL=
ENV DEBIAN_FRONTEND=noninteractive
# CasparCG 2.4 runtime deps + Xvfb for headless GL + CEF (HTML producer) deps +
# Node 20 (NodeSource) + a STANDALONE ffmpeg CLI. The standalone ffmpeg is what
# the Node shim spawns to re-mux the CasparCG mpegts preview stream into clean,
# video-only HLS (CasparCG's own FFMPEG consumer silently drops -an and muxes a
# broken audio track, which black-screens the browser preview).
# Node 20 (NodeSource).
#
# NOTE: we deliberately do NOT `apt-get install ffmpeg`. That package drags in
# ~80 transitive shared libraries (libav*, libx264, libdrm, libva, ...) that
# perturb CasparCG 2.4.0's runtime linking and make its headless startup abort
# with SIGABRT (exit 134) on nearly every launch. A self-contained STATIC
# ffmpeg binary (installed below) gives us the standalone CLI the preview
# re-muxer needs with ZERO new shared libs, keeping CasparCG's environment
# identical to the known-good image.
RUN apt-get update && apt-get install -y --no-install-recommends \
ca-certificates curl unzip tar xz-utils gnupg ffmpeg \
ca-certificates curl unzip tar xz-utils gnupg \
xvfb libgl1-mesa-dri libglu1-mesa fonts-dejavu-core \
libnss3 libnspr4 libatk1.0-0 libatk-bridge2.0-0 libcups2 libdrm2 \
libxkbcommon0 libxcomposite1 libxdamage1 libxfixes3 libxrandr2 \
@ -44,6 +49,20 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
&& apt-get update && apt-get install -y --no-install-recommends nodejs \
&& rm -rf /var/lib/apt/lists/*
# ── Standalone STATIC ffmpeg CLI (for the HLS preview re-muxer) ───────────────
# john van sickle's static build is fully self-contained (no shared-lib deps),
# so it can't perturb CasparCG's runtime linking. Override FFMPEG_URL to mirror
# this into your own artifact store if upstream availability is a concern.
ARG FFMPEG_URL=https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz
RUN set -eux; \
curl -fsSL "$FFMPEG_URL" -o /tmp/ffmpeg.tar.xz; \
mkdir -p /tmp/ffmpeg; \
tar xJf /tmp/ffmpeg.tar.xz -C /tmp/ffmpeg --strip-components=1; \
cp /tmp/ffmpeg/ffmpeg /tmp/ffmpeg/ffprobe /usr/local/bin/; \
chmod +x /usr/local/bin/ffmpeg /usr/local/bin/ffprobe; \
rm -rf /tmp/ffmpeg /tmp/ffmpeg.tar.xz; \
/usr/local/bin/ffmpeg -version | head -1
# ── CasparCG Server (ubuntu22 zip bundle) ────────────────────────────────────
# The zip extracts to /opt/casparcg_server with the binary at bin/casparcg and
# its bundled .so files under lib/ (added to LD_LIBRARY_PATH by entrypoint.sh).