I recently had an HD transfer of old family 8mm films done and the result is in 1560x1080 MJPEG-A files in a mov container. I was hoping to make some quick clips of the films to share with the family ...

If you are unable to open an MP4 file on our media player, try changing the video format. There are many good video converters available on the internet that can help you convert your MP4 to MP3, AVI, ...