parameter- und zielordnerhandling verbessert

scripts/transcode_m4a.sh

@@ -1,16 +1,24 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-for file in ./*.$1; do
-   map='';
-   if [[ $# > 1 && $2 == 'map' ]]; then
-   	  map='-map 0:0';
-   fi
-   dest=../transcode_m4a
-   if [[ !(-d $dest) ]]; then
-      mkdir $dest
-   fi
-   echo "ffmpeg -i '$file' -c:a libfdk_aac -profile:a aac_he -b:a 64k -movflags +faststart $map '$dest/${file%$1}m4a'";
-   ffmpeg -i "$file" -c:a libfdk_aac -profile:a aac_he -b:a 64k -movflags +faststart $map "$dest/${file%$1}m4a";
+# evaluate options through given arguments
+file_suffix=
+map=
+while [[ $# > 0 ]]; do
+   case $1 in
+      -t | --type) file_suffix=$2; shift 2;;
+      -map       ) map='-map 0:0'; shift;;
+      *          )                 break ;; # Anything else stops command line processing.
+   esac
 done
 
+# ensure existence of destination folder
+dest=../transcode_m4a
+if [[ !(-d $dest) ]]; then
+   mkdir $dest
+fi
+
+for file in ./*.$file_suffix; do
+   echo "ffmpeg -i '$file' -c:a libfdk_aac -profile:a aac_he -b:a 64k $map -movflags +faststart '$dest/${file%$file_suffix}m4a'";
+   ffmpeg -i "$file" -c:a libfdk_aac -profile:a aac_he -b:a 64k $map -movflags +faststart "$dest/${file%$file_suffix}m4a";
+done