Who else is annoyed that the action cam allways adds YDXJXXX to every name ?
I wrote a small service for your mac that removes the YDXJ in front of every name.
Just download here: https://drive.google.com/open?id=0B2mV4sKy8QMaT1V4M1Rha2Nadkk
Install then select your desired files, right click, under services you'll find YDXJ remover. just right click and PUFF there gone.