john@sympatico.ca
4th December 2002, 05:20
I am trying to find an easy and reliable method to compare the originals and backups that I am making. I do not have a way of playing them side by side.
So far what I have come up with is to take screenshots of the first frame of each chapter, for both the original and the backup. In an image viewer I can flip back and forth between them to see what if any differences there are.
However I'm not sure that this is a good way to do this, maybe the first frame of each chapter is a keyframe or, something that would not necessarily show the weaknesses of the copy.
An example of how this method may be flawed: although in the examples (at the URL below), I can make nearly no distinction between the backup and the original screenshots for AKIRA. Artifacts can be seen when the film is in motion.
(The JSA film seems near flawless when viewed).
So, apart from watching the 2 films back to back, or side by side, are there any other quick and reliable ways to compare the quality of the backup and original?
Test images at:
http://www3.sympatico.ca/john/tmp/dvd/ (http://www3.sympatico.ca/john/tmp/dvd)
(for those of you who look at them, sorry, I forgot which ones were the originals and which were the backups :rolleyes: )
So far what I have come up with is to take screenshots of the first frame of each chapter, for both the original and the backup. In an image viewer I can flip back and forth between them to see what if any differences there are.
However I'm not sure that this is a good way to do this, maybe the first frame of each chapter is a keyframe or, something that would not necessarily show the weaknesses of the copy.
An example of how this method may be flawed: although in the examples (at the URL below), I can make nearly no distinction between the backup and the original screenshots for AKIRA. Artifacts can be seen when the film is in motion.
(The JSA film seems near flawless when viewed).
So, apart from watching the 2 films back to back, or side by side, are there any other quick and reliable ways to compare the quality of the backup and original?
Test images at:
http://www3.sympatico.ca/john/tmp/dvd/ (http://www3.sympatico.ca/john/tmp/dvd)
(for those of you who look at them, sorry, I forgot which ones were the originals and which were the backups :rolleyes: )