initial loop tested version

root/etc/cont-init.d/30-config

@@ -0,0 +1,18 @@
+#!/usr/bin/with-contenv bash
+
+# create directories
+mkdir -p \
+	/config/{log,data,cache} \
+	/data \
+	/transcode
+
+# permissions
+chown abc:abc \
+	/config \
+	/config/* \
+	/data \
+	/transcode
+if [ -n "$(ls -A /data 2>/dev/null)" ]; then
+chown abc:abc \
+	/data/*
+fi

root/etc/cont-init.d/40-gid-video

@@ -0,0 +1,25 @@
+#!/usr/bin/with-contenv bash
+
+# Check for the existence of the Intel video device
+if [ -e /dev/dri ]; then
+	VIDEO_GID=$(stat -c '%g' /dev/dri/* | grep -v '^0$' | head -n 1)
+else
+	exit 0
+fi
+
+# Check if this GID matches the current abc user
+ABCGID=$(getent group abc | awk -F: '{print $3}')
+if [ "${ABCGID}" == "${VIDEO_GID}" ]; then
+	exit 0
+fi
+
+# Check if the GID is taken and swap to 65533
+CURRENT=$(getent group ${VIDEO_GID} | awk -F: '{print $1}')
+if [ -z "${CURRENT}" ] || [ "${CURRENT}" == 'video' ]; then
+	groupmod -g ${VIDEO_GID} video
+	usermod -a -G video abc
+else
+	groupmod -g 65533 ${CURRENT}
+	groupmod -g ${VIDEO_GID} video
+	usermod -a -G video abc
+fi

root/etc/services.d/jellyfin/run

@@ -0,0 +1,10 @@
+#!/usr/bin/with-contenv bash
+
+export JELLYFIN_DATA_DIR="/config/data" \
+JELLYFIN_CONFIG_DIR="/config" \
+JELLYFIN_LOG_DIR="/config/log" \
+JELLYFIN_CACHE_DIR="/config/cache" 
+
+exec \
+	s6-setuidgid abc /usr/bin/jellyfin \
+	--ffmpeg=/usr/lib/jellyfin-ffmpeg/ffmpeg