Hi Again,
I wanted to give you an update that may help you narrow down a solution to the problem of some .mov files playing while others do not. I did some troubleshooting and here is what I came up with (please download 3 new drop box files so you can duplicate it):
1. This file, from my Nikon Coolpix camera, plays fine in Video Splitter:
https://www.dropbox.com/s/74kxx5rsjxor7rx/Coolpix-plays%20fine.MOV
2. This file plays fine, which was a sample file from Quicktime:
https://www.dropbox.com/s/krdw8cctapiakqh/Sample01Plays%20fine.mov
3. This file, from my Panasonic Lumix camera, shows a sound track but does not play any video (it plays fine, however, in Quicktime player):
https://www.dropbox.com/s/1hr3aja0aiur10p/Lumix-Sound%20but%20no%20video.MOV
I hope that this helps you to find and resolve the issue. i am looking forward to your response.
Thanks in advance:)
njb