vlc-debian-unstable: Install ffmpeg development packages.

vlc-debian-unstable/Dockerfile

@@ -2,6 +2,9 @@ FROM videolan-base-sid:latest
 
 RUN apt-get update && apt-get build-dep -y vlc && \
     apt-get install -y git-core libtool automake autoconf autopoint make \
-    gettext pkg-config subversion cmake cvs zip bzip2 p7zip-full wget dos2unix \
-    ragel yasm g++ protobuf-compiler m4 ant build-essential libtool-bin && \
+    gettext pkg-config subversion cmake cvs zip bzip2 p7zip-full wget \
+    dos2unix ragel yasm g++ protobuf-compiler m4 ant build-essential \
+    libtool-bin libavcodec-dev libavdevice-dev libavfilter-dev \
+    libavformat-dev libavresample-dev libavutil-dev libpostproc-dev \
+    libswscale-dev && \
     apt-get clean -y && rm -rf /var/lib/apt/lists/*