Improve the compress video scripts

bin/compress-video

@@ -23,20 +23,25 @@ else
     NORMAL=""
 fi
 
-use_gpu=$1
-filename=$(basename -- "$2")
-output_name="$3"
+use_gpu=0
 
-if [[ $use_gpu == "" || $2 == "" || $output_name == "" ]]; then
-    printf "${BOLD}${RED}Usage: $0 <use-gpu (1|0)> <filename> <output name>${NORMAL}\n"
+if [[ $# < 2 || $# > 3 ]]; then
+    printf "${BOLD}${RED}Usage: $0 <filename> <output name> <optional: use-gpu (1|0), defaults to $use_gpu> ${NORMAL}\n"
     exit 1
 fi
 
+filename=$(basename -- "$1")
+output_name="$2"
+
+if [[ $# > 2 ]]; then
+    use_gpu=$3
+fi
+
 # Found the following to work best with vids containing text (e.g. programming vid): 25 for CPU encoding and 27 for GPU.
 use_crf=21
 if [[ $use_gpu -eq 1 ]]; then
     use_crf=25
 fi
 
-compress-video-with-crf $use_gpu $use_crf "$filename" "$output_name"
+compress-video-with-crf $use_crf "$filename" "$output_name" $use_gpu