enable rpi hw decode, readme updates

also create missing default transcodes folder

root/donate.txt

@@ -0,0 +1 @@
+Jellyfin: https://opencollective.com/jellyfin

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

@@ -2,7 +2,7 @@
 
 # create directories
 mkdir -p \
-	/config/{log,data,cache} \
+	/config/{log,data/transcodes,cache} \
 	/data \
 	/transcode
 
@@ -11,6 +11,7 @@ chown abc:abc \
 	/config \
 	/config/* \
 	/data \
+	/data/transcodes
 	/transcode
 if [ -n "$(ls -A /data 2>/dev/null)" ]; then
 chown abc:abc \

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

@@ -1,6 +1,6 @@
 #!/usr/bin/with-contenv bash
 
-FILES=$(find /dev/dri /dev/dvb /dev/vchiq /dev/video1? -type c -print 2>/dev/null)
+FILES=$(find /dev/dri /dev/dvb /dev/vchiq /dev/vc-mem /dev/video1? -type c -print 2>/dev/null)
 
 for i in $FILES
 do