[Scripts] Add batch video conversion script

scripts/convert-to-mp4

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+extension="out"
+read -p "Pick extension to convert from: " extension
+outfolder="out"
+outext="mp4"
+read -p "Output folder: " outfolder
+read -p "Output extension: " outext
+
+mkdir $outfolder
+for file in *.$extension; do
+    ffmpeg -i "$file" "$outfolder/${file%.$extension}.$outext"
+    echo "\n\n==> Conversion complete\n\n"
+done