Handbrake bug - Old MP4 videos with MP3 audio

[breichert@zenwalk ~]$ exiftool videoname.mp4 | grep Encoder
Encoder                         : HandBrake rev5474 2014070999

#!/bin/bash
echo "How much files:"
find . -name '*.mp4' -type f | wc -l

echo "Read files:"
find . -type f \( -name "*.mp4" \) -print0 | while read -r -d '' file; do
	VERSION="0.9.4"
	ENCODER=$(exiftool "$file" | grep Encoder) #MP4Box "$file" -info 2>&1 | grep "Encoder Software"
	if [[ $ENCODER == *"HandBrake rev"* ]]
	then
		echo "$file" "->" $ENCODER
		read num1_rev num2_date <<<${ENCODER//[^0-9]/ } NUMBER

		#Handbrake Rev:
		if [ "$num1_rev" -eq "7288" ]
		    then VERSION="0.10.2"
		  elif [ "$num1_rev" -eq "6980" ]
		    then VERSION="0.10.1"
		  elif [ "$num1_rev" -eq "6536" ]
		    then VERSION="0.10.0"
		  elif [ "$num1_rev" -eq "5474" ]
		    then VERSION="0.9.9"
		  elif [ "$num1_rev" -eq "3736" ]
		    then VERSION="0.9.5"
		  elif [ "$num1_rev" -eq "2965" ]
		    then VERSION="0.9.4"
		  else VERSION="0.9.4"
		fi
		
		ENCODER_TOOL="HandBrake $VERSION rev$num1_rev $num2_date"
		echo "->" $ENCODER_TOOL
		
		MP4Box -itags tool="$ENCODER_TOOL" "$file"
	fi
done

[breichert@zenwalk ~]$ exiftool videoname.mp4 | grep Encoder
Encoder                         : HandBrake 0.9.9 rev5474 2014070999