From 869ae1aa83bb1fdc4f6bb3bd9430a6b236c6bbab Mon Sep 17 00:00:00 2001
From: Zac Gaetano <Zgaetano@wilddragon.net>
Date: Sun, 31 May 2026 14:18:56 -0400
Subject: [PATCH] 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>
---
 services/playout/Dockerfile | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/services/playout/Dockerfile b/services/playout/Dockerfile
index f93bcba..d82953f 100644
--- a/services/playout/Dockerfile
+++ b/services/playout/Dockerfile
@@ -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).