Which is the original and which is the copy?

[JohnnyCNote]

Using the method described in "Johnny C-Note’s Quick and Easy Guide", I backed up "Wall Street" the other day. These are frames captured from the original and the back up. I'd like to see if anyone can tell the difference.

#1:



#2

[Hardcoreruss]

So where are your screen shots ?

[JohnnyCNote]

Try again. They should work now...

[andkiich]

Strike 2!

[Hardcoreruss]

I go with number 2

[Hardcoreruss]

I go with number 2

Sorry as the original

[lechtin]

I'd say number 2 is the original.

[shelbyGT]

the guys face in the background is shaprer on #2, so i said two.

[adam]

No offense but this is pointless. First off you can't judge the quality of an mpeg by judging even a hundred still pictures, let alone a single one.

Secondly, after briefly reading that guide you used, it appears you used a transcoder. These are limited to compressing DCT data, and not all frames contain the same amount of this, and some may contain so little that during the transcoding they are left completely untouched. So one still picture means nothing, because we have no idea how much it was compressed from the source or whether it even was compressed at all. For all you know, both of your stills could literally be identical.

Lastly, you are using jpeg compression for these stills. Jpeg compression is just as lossy as mpeg, so you are further compressing them which will also have an effect on their quality. Neither of those pics is a direct still taken from the source, you'd have to use a bmp for that.

The only real way to judge the quality of an mpeg is to just watch a healthy sample of it. Since its not very practical to host such large files, ie: both samples plus original source, its better if people just judge their own encodes for themselves.

[shelbyGT]

whoa dude, chill 8)

[JohnnyCNote]

You're right, #2 is the original. however I honestly can't tell any difference. Admittedly, this is not a scientific test, just an experiment. Still, I can hardly tell any difference between the copies and the originals. What differences that exist are so minute that no one who's seen them on the screen has been able to detect them. Ultimately, they're acceptable for me, which is all that really matters....

[adam]

shelbyGT

I'm not angry, I'm simply explaining why video quality cannot be measured by looking at screen samples, especially when dealing with a compression scheme which litteraly only compresses random frames. Its like saying two piles of change are equal simply because I close my eyes and randomly pull a dime out of both.

Still, I can hardly tell any difference between the copies and the originals. What differences that exist are so minute that no one who's seen them on the screen has been able to detect them. Ultimately, they're acceptable for me, which is all that really matters....

Exactly my point. This is the only test that has any meaning.

[Faustus]

Hard to to make a choice between dead link number 1 and deadlink number 2.

[JohnnyCNote]

It should be okay now. I had to transfer the files to another server...

[mob]

Access Denied. Bandwidth limit exceeded.

[Tommyknocker]

One red x seems clearer than the other.

[donpedro]

"Access Denied. Bandwidth limit exceeded."

[MOVIEGEEK]

One red x seems clearer than the other.

Seriously comparing two compressed images on a monitor isn't the same as watching them on TV.

[shelbyGT]

they look fine to me

(cached)

[ddlooping]

Hi all.

Look at my avatar!! It's the same frame captured from the DVD Shrink made backup.

[JohnnyCNote]

"Access Denied. Bandwidth limit exceeded."

Where are you getting this message, from my signature or somewhere else? Evidently, after all these months, suddenly everyone started looking at my signature and caused me to esceed the bandwidth limits that Bellsouth.net provides its DSL customers. Of course, they don't make this information available until it's too late, and no one a their tech support knows anything about it.

If it's the pictures, I can put them elsewhere, but I got the impression it was either a waste of time or people were otherwise not interested. However, it's easy enough to move them and edit the URL's if people really want to continue my little unscientific test....

[donpedro]

I copied link from image and paste it to address bar in new IE window. That is how I have got that error.

For very short time you can see message about limit 33MB per day

[JohnnyCNote]

Try it again, I just changed the server...

[donpedro]

It works now

[JohnnyCNote]

Seriously comparing two compressed images on a monitor isn't the same as watching them on TV.

What about the magazines like PC Magazine, PC World, Computer Shopper, etc., where they do this sort of thing all the time? Although it should go without saying that this is clearly not the same as seeing it on a video monitor....

[JohnnyCNote]

It works now

Thanks for the help!