Extract NMEA from Blackvue

gistfile1.txt

#!/bin/bash
rm session.txt
for FILE in "$@"
do
echo $FILE
FILENMEA="$FILE.txt"
echo $FILENMEA
../exiftool -GPSLog -b $FILE | sed '/^.*\$GPRMC.*$/!d;s/\[[[:digit:]]*\]//g' > $FILENMEA
cat $FILENMEA >> session.txt
done

Needs copy of exiftool in a directory.
Usage:
extrach.sh *.mp4

Extracts GPRMC sentences and removes strange timestamp.