diff --git a/Dockerfile b/Dockerfile
index 0bd8973..3ba5e86 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,6 +23,7 @@ RUN \
   echo "**** install packages ****" && \
   apk add --no-cache \
     curl \
+    ffmpeg \
     libjpeg-turbo \
     p7zip \
     py3-pip \