Add script to transcode a batch of files with ffmpeg

arch-config/scripts/pieces/ffmpeg-transcode.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if $# -ne 3; then
+    echo "Please use this script with \"PATH\" \"Input Extension\" \"Output Extension\""
+fi
+
+# TODO argument sanity check
+
+dir=$1
+inext=$2
+outext=$3
+numjobs=4
+
+# go to target dir
+cd "$dir"
+
+# select all files
+readarray -d '' infiles < <(find . -name "*\.$inext" -print0)
+
+for file in "${infiles[@]}"; do
+    # only run $numjobs
+    while [[ $(jobs | wc -l) -gt $numjobs ]] ; do sleep 1 ; done
+    # filename
+    file="$(basename "$file")"
+    # no extension
+    noextfile="${file%.*}"
+    # new extension
+    outextfile="${noextfile}.${outext}"
+    # actually use ffmpeg
+    ffmpeg -nostdin -i "$file" "${outextfile}" &
+done
+
+$(exit 0); echo "$?"