-# audio options
-audio := $(shell echo $(AUDIO) | tr 'A-Z' 'a-z')
-AUDIO := $(shell echo $(AUDIO) | tr 'a-z' 'A-Z')
-
-# video options
-video := $(shell echo $(VIDEO) | tr 'A-Z' 'a-z')
-VIDEO := $(shell echo $(VIDEO) | tr 'a-z' 'A-Z')
+# audio and video options
+AUDIO := $(shell echo $(AUDIO) | tr 'A-Z' 'a-z')
+VIDEO := $(shell echo $(VIDEO) | tr 'A-Z' 'a-z')