Only enable intel hwaccel libs on amd64

transcoder/Dockerfile.dev

@@ -23,6 +23,10 @@ ENV SSL_CERT_DIR=/etc/ssl/certs
 RUN update-ca-certificates
 
 RUN go install github.com/bokwoon95/wgo@latest
+
+# read target arch from buildx or default to amd64 if using legacy builder.
+ARG TARGETARCH
+ENV TARGETARCH=${TARGETARCH:-amd64}
 RUN sed -i -e's/ main/ main contrib non-free/g' /etc/apt/sources.list.d/debian.sources
 RUN apt-get update \
 	&& apt-get install --no-install-recommends --no-install-suggests -y \
@@ -31,7 +35,9 @@ RUN apt-get update \
 	# build dependencies
 	libavutil-dev libswscale-dev libmediainfo-dev \
 	# hwaccel dependencies
-	vainfo mesa-va-drivers intel-media-va-driver-non-free i965-va-driver-shaders \
+	vainfo mesa-va-drivers \
+	# intel hwaccel dependencies, not available everywhere
+	$([ " $TARGETARCH" = " amd64" ] && echo "intel-media-va-driver-non-free i965-va-driver-shaders") \
 	&& apt-get clean autoclean -y \
 	&& apt-get autoremove -y
 WORKDIR /app