Quick Bash script to rebuild videos from the Echo 360 ESS flash format into mp4, highly dependant on framerate so check framerate if video is out of sync

echomigrate.sh

#!/bin/bash
# Process an echo export into MP4 files
# requires FFMPEG -loglevel error -hide_banner and SWFExtract
# Ensure you have swfextract http://www.swftools.org/swfextract.html installed and in your path
# Ensure you have ffmpeg installed and in your path https://www.ffmpeg.org/

# Check if SWFextarct is installed and avaliable
command -v swfextract &>/dev/null || {
	echo >&2 "I require swfextract but it's not installed.  Aborting."
	exit 1
}

# Check if ffmpeg -loglevel error -hide_banner is installed and avaliable
command -v ffmpeg -loglevel error -hide_banner &>/dev/null || {
	echo >&2 "I require FFMpeg -loglevel error -hide_banner but it's not installed.  Aborting."
	exit 1
}

#Assign the first input to a variable named file
file=$1

#Assign the second input to a variable named crop
crop=$2

#Assign the filename without extension to a variable named filename
filename=${file%.zip}
echo $filename

echo "Unzipping"
unzip -qq $file -d temp

screen1=FALSE
screen2=FALSE

#Check if swf style slides exist for screen 1 and extarct the JPEG slides
if [ -d "temp/${filename}_files/slides" ]; then
	screen1=TRUE

	#Find all swf filed in the slides directory and exrtact the full slide jpg (id 3) from the swf file
	find "temp/${filename}_files/slides" -name '*.swf' -exec swfextract -j 3 {} -o {}.jpg \;
else
	echo "No Screen found for $filename"
fi
#Check if swf style slides exist for screen 2 and extarct the JPEG slides
if [ -d "temp/${filename}_files/slides2" ]; then
	screen2=TRUE

	#Find all swf filed in the slides2 directory and exrtact the full slide jpg (id 3) from the swf file
	find "temp/${filename}_files/slides2" -name '*.swf' -exec swfextract -j 3 {} -o {}.jpg \;
else
	echo "No Second Screen found for $filename"

fi

if [[ $screen1 == TRUE ]]; then
	#read the presentation xml file line by line to extract the timestamps for screen 1
	echo "Extracting Screen 1 Slides"
	slides=FALSE
	echo >screen1concat
	while IFS= read -r var; do

		if [[ "$var" == *"<track type=\"flash-movie\" directory=\"slides\" "* ]]; then
			slides=TRUE
		fi

		if [[ $slides == TRUE ]] && [[ "$var" != *"</track>"* ]]; then
			if [[ $var =~ duration=.([0-9]{4,9})..uri=.([0-9]{4,9}) ]]; then
				duration="${BASH_REMATCH[1]}"
				url="${BASH_REMATCH[2]}"

				echo "file temp/${filename}_files/slides/$url.swf.jpg\nduration $((duration / 1000))" >>screen1concat
			fi
		fi

		if [[ "$var" == *"</track>"* ]]; then
			slides=FALSE
		fi

	done \
		<"temp/${filename}_files/presentation.xml"
fi

if [[ $screen2 == TRUE ]]; then
	#read the presentation xml file line by line to extract the timestamps for screen 2
	echo "Extracting Screen 2 Slides"
	slides=FALSE
	echo >screen2concat
	while IFS= read -r var; do

		if [[ "$var" == *"<track type=\"flash-movie\" directory=\"slides2\" "* ]]; then
			slides=TRUE
		fi

		if [[ $slides == TRUE ]] && [[ "$var" != *"</track>"* ]]; then
			if [[ $var =~ duration=.([0-9]{4,9})..uri=.([0-9]{4,9}) ]]; then
				duration="${BASH_REMATCH[1]}"
				url="${BASH_REMATCH[2]}"

				echo "file temp/${filename}_files/slides2/$url.swf.jpg\nduration $((duration / 1000))" >>screen2concat
			fi
		fi

		if [[ "$var" == *"</track>"* ]]; then
			slides=FALSE
		fi

	done \
		<"temp/${filename}_files/presentation.xml"
fi

#create the migration directory and join the images with FFMPEG -loglevel error -hide_banner
echo "Converting slides to MP4"
mkdir ${filename}_Migration
ffmpeg -loglevel error -hide_banner -f concat -safe 0 -i "screen1concat" -c copy ${filename}_Migration/${filename}screen1.mp4
ffmpeg -loglevel error -hide_banner -f concat -safe 0 -i "screen2concat" -c copy ${filename}_Migration/${filename}screen2.mp4

#remove the copyrightsatement from the audio and copy it to the output dir
echo "Trimming copyright statement from audio"
ffmpeg -loglevel error -hide_banner -i "temp/${filename}_files/audio.mp3" -ss 00:00:19 -c copy audio_trim.mp3
cp "audio_trim.mp3" ${filename}_Migration/${filename}audio.mp3

#combine the audio and first screen
echo "Adding audio to screen 1"
ffmpeg -loglevel error -hide_banner -i ${filename}_Migration/${filename}screen1.mp4 -i ${filename}_Migration/${filename}audio.mp3 -c:v copy -c:a copy output.mp4
cp "output.mp4" ${filename}_Migration/${filename}audio_video.mp4

#copy the presentation xml
cp temp/${filename}_files/presentation.xml ${filename}_Migration/presentation.xml

#cleanup the temp files
echo "Cleaning up temp files"
rm "audio_trim.mp3"
rm "output.mp4"
rm "screen1concat"
rm "screen2concat"

rm -rf "temp"

if [ -z "$2" ] && [ "$2" == "crop" ]; then
	echo No crop requested
else

	# do not reduce the loglevel for this command as need to awk the output for the crop values
	cropvalue=$(ffmpeg -ss 00:23:00 -i ${filename}_Migration/${filename}audio_video.mp4 -vframes 10 -vf cropdetect=24:16:0 -f null - 2>&1 | awk '/crop/ { print $NF }' | tail -1)
	IFS=':' read -r -a array <<<"$cropvalue"

	width=$((array[3] + array[0]))
	echo "cropping to: $cropvalue"
	echo "crop=$width:${array[1]}:0:${array[3]}"
	ffmpeg -loglevel error -hide_banner -i ${filename}_Migration/${filename}audio_video.mp4 -vf "crop=$width:${array[1]}:$((array[3])):${array[3]}" -c:a copy ${filename}_Migration/${filename}audio_video_croppped.mp4

fi

echo "DONE"
echo
exit 0