docker-plex/root/etc/cont-init.d/50-gid-video

#!/usr/bin/with-contenv bash

FILES=$(find /dev/dri /dev/dvb -type c -print 2>/dev/null)

for i in $FILES
do
    VIDEO_GID=$(stat -c '%g' "$i")
    if ! id -G abc | grep -qw "$VIDEO_GID"; then
        VIDEO_NAME=$(getent group "${VIDEO_GID}" | awk -F: '{print $1}')
        if [ -z "${VIDEO_NAME}" ]; then
            VIDEO_NAME="video$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c8)"
            groupadd "$VIDEO_NAME"
            groupmod -g "$VIDEO_GID" "$VIDEO_NAME"
        fi
        usermod -a -G "$VIDEO_NAME" abc
        if [ $(stat -c '%A' "${i}" | cut -b 5,6) != "rw" ]; then
            echo -e "**** The device ${i} does not have group read/write permissions, which might prevent hardware transcode from functioning correctly. To fix it, you can run the following on your docker host: ****\nsudo chmod g+rw ${i}\n"
        fi
    fi
done