#!/bin/bash

# isInterlaced (Returns error if progressive for single file check)

# example: isInterlaced file.mxf && echo "yes, it is interlaced!"

set -e

while [ $# -gt 0 ]; do
	
	echo "$1"

	read -r _ _ _ _ _ _ _ tff _ bff _ progressive _ undef \
	<<< "$(ffmpeg -filter:v idet -frames:v 1000 -an -f rawvideo -y /dev/null 2>&1 -i "$1" | grep "idet" | grep "Multi frame detection")"	
	# if it makes no sense skip the rest
	if [[ -z "$tff" ]]; then
		
		echo "no sense"
		shift
		continue

	fi	

	echo "tff $tff, bff $bff, progressive $progressive, undef $undef"

	if (( tff + bff + progressive < undef )); then
	
		echo "undefined"
	
	elif (( tff + bff > progressive )); then

		echo "☰ interlaced"
		status="1"
	else 

		echo "█ progressive"
		status="0"

	fi


	shift
done

# this only makes sense if you check single file, like:
# isInterlaced file.mxf && echo yes
((status)) || exit 1