Check the file with a hex viewer or by renaming the extension to see if it’s actually:
If you have stumbled upon a file with the extension .jdr and you need to play it on a standard video player like VLC, QuickTime, or your smartphone, you have likely run into a wall of frustration. By default, Windows, Mac, and Linux do not recognize JDR files. convert jdr file to mp4
Warnings:
Are you trying to convert this on a ?