From caa06258cf538ab5f58e82abc6e898a157f8fe2f Mon Sep 17 00:00:00 2001
From: Sebastian Husch Lee <sjrl423@gmail.com>
Date: Mon, 13 Jul 2026 09:18:25 +0200
Subject: [PATCH] install ffmpeg into CI env of vllm

---
 .github/workflows/vllm.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.github/workflows/vllm.yml b/.github/workflows/vllm.yml
index c351a61b8b..d64c321c28 100644
--- a/.github/workflows/vllm.yml
+++ b/.github/workflows/vllm.yml
@@ -79,6 +79,13 @@ jobs:
           python -m pip install --upgrade pip
           pip install hatch --uploaded-prior-to=P1D
 
+      - name: Install FFmpeg
+        run: |
+          # Recent vLLM imports torchcodec at startup, which needs FFmpeg's shared libraries
+          # (libavutil.so.*); without them `vllm serve` crashes on import and never binds its port.
+          sudo apt-get update
+          sudo apt-get install -y ffmpeg
+
       - name: Install vLLM (CPU)
         run: |
           # vLLM on PyPI is GPU-only and requires CUDA, so it won't run on CPU-only systems.