#!/bin/bash

for pptName in ./*.pptx; do
	mkdir "${pptName}_folder"
	cd "${pptName}_folder"
	unzip "../$pptName"
	cd ppt/media
	if [ -f "media1.mp4" ]; then
		for filename in ./*.mp4; do
		    ffmpeg -i "$filename" -vf scale=1920:1080 -strict -2 -c:v libx264 -crf 30 -preset slow "${filename}_small.mp4"; cat "${filename}_small.mp4" > "$filename"; rm "${filename}_small.mp4"
		    #ffmpeg -i "$filename" -vf scale=1280:720 -strict -2 -c:v libx264 -crf 30 -preset slow "${filename}_small.mp4"; cat "${filename}_small.mp4" > "$filename"; rm "${filename}_small.mp4"
		done
	fi
	cd ../../
	NEW_FILE=$(basename "${pptName}" .pptx)
	zip -r "../${NEW_FILE}_small.pptx" ./*
	# zip -r "../${pptName}_small_720.pptx" ./*
	cd ..
	rm -rf  "${pptName}_folder"
done