So, I've got a iPad 3.
Since day 1 I've got no problem with recording videos and uploading it directly to youtube.

But quite some time ago, I got errors while trying to upload my iPad recorded videos directly to YouTube after transferring them to computer (and I've tried using different computers) and recently, those videos can't be detected by video editors as well. They'll just show blank video but with sounds.

So I have to convert them using video converters into exactly the same format as before for them to work in YouTube and video editors.

What happened??