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    Invelos Forums->DVD Profiler: Contribution Discussion Page: 1 2 3 4  Previous   Next
Dual-layer Blu-ray discs vs. actual data pressed
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DVD Profiler Unlimited RegistrantStar ContributorNexus the Sixth
Contributor since 2002
Registered: March 13, 2007
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Quoting Grendell:
Quote:
What oversimplification?

How is a disc not single layer if it's less than 12,219,392 sectors, or dual layer if it's greater?


The question was whether these sectors contained data or not and if that makes a difference to us.
First registered: February 15, 2002
 Last edited: by Nexus the Sixth
DVD Profiler Desktop and Mobile Registrantmediadogg
Aim high. Ride the wind.
Registered: March 18, 2007
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Quoting Grendell:
Quote:
What oversimplification?

How is a disc not single layer if it's less than 12,219,392 sectors, or dual layer if it's greater?


- the original question had to do with whether it was the amount of data vs. whether the disc actually had data on one or two layers. So what would you call a disc that has 12,000,000 sectors of data written on a DL disc? That was one of the questions. You can't dismiss the question by simply choosing one of the answers and discounting other points of view.
- ever heard of "triple-layer"?
- ever take a look at the DVD specification and notice the overlap between DL and SL for +R?

(Seems like iPatsa beat me to it!)
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 Last edited: by mediadogg
DVD Profiler Unlimited RegistrantGrendell
One disc at a time...
Registered: May 8, 2007
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An unused layer?

Why on earth would anyone want to call a disc with an unused layer dual layer? Why useful purpose would that serve, whatsoever.

I have to question the motivation and agenda of the user who is changing discs with unused layers to dual layer.
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DVD Profiler Desktop and Mobile Registrantmediadogg
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Registered: March 18, 2007
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Quoting Grendell:
Quote:

I have to question the motivation and agenda of the user who is changing discs with unused layers to dual layer.

Why do that? The person must think they are correct. The thread was started to ponder the question of correctness, not assail motives - that, to me, would be a really useless activity and count me out of that.
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DVD Profiler Unlimited RegistrantGrendell
One disc at a time...
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My question still stands. What possible use would it serve (to anyone) to classify discs with an unused layer dual layer? Still waiting for the answer.
99.9% of all cat plans consist only of "Step 1."
DVD Profiler Desktop and Mobile Registrantmediadogg
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Quoting Grendell:
Quote:
My question still stands. What possible use would it serve (to anyone) to classify discs with an unused layer dual layer? Still waiting for the answer.

Because the definition of Dual Layer (Industry Standard) does not require any data to be on the disc. Ever heard of a blank Dual Layer disc? This is useful because if you buy the wrong disc, your data will not fit, or your player will not handle it (e.g. XL triple layer). Question answered.

The question on the table is whether the Invelos definition requires data or not, based on the wording of the Rules.

This is at least the 2nd time I have answered you. If you don't have anything constructive to add to the discussion, I have no more to say to you on this matter.
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 Last edited: by mediadogg
DVD Profiler Unlimited RegistrantGrendell
One disc at a time...
Registered: May 8, 2007
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Quoting mediadogg:
Quote:
Because the definition if Dual Layer (Industry Standard) does not require any data to be on the disc. Ever heard of a blank Dual Layer disc? This is useful because if you buy the wrong disc, your data will not fit, or your player will not handle it (e.g. XL triple layer). Question answered.


Sorry, you are way off. Apples to oranges. A blank disc is writable by the consumer. Its unformatted capacity is something you need to know.

All commercial Blu-Ray players will play single or dual layer BD-ROMs, by standard.

A purchased Blu-Ray is a BD-ROM. It it NOT writable by the consumer. The only useful information in terms of layers for such a disc is its formatted capacity. There is NO useful reason whatsoever for the end user to know that a single layer Blu-Ray movie disc is actually stored on a BD-ROM that is dual layer, but the second layer is not used.

If a user is going in and changing profiles to dual layer if there is a second unused layer (however on Earth they are determining that), THAT undermines the usefulness and integrity of the database, and I question why ANYONE would want to do that. I would want to know who that user is, so I can be on the lookout for further updates from him or her.
99.9% of all cat plans consist only of "Step 1."
 Last edited: by Grendell
DVD Profiler Desktop and Mobile RegistrantStar ContributorTheMadMartian
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Registered: March 13, 2007
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Quoting Kathy:
Quote:
I have no idea what in the world you are talking about...nor do I want to!

I am willing to bet that most of our users fall into this same boat.  I am also willing to bet that this discussion, and proposed fix, will mean very little to the average user.
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DVD Profiler Desktop and Mobile Registrantmediadogg
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Registered: March 18, 2007
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Quoting TheMadMartian:
Quote:
Quoting Kathy:
Quote:
I have no idea what in the world you are talking about...nor do I want to!

I am willing to bet that most of our users fall into this same boat.  I am also willing to bet that this discussion, and proposed fix, will mean very little to the average user.

I also couldn't care less. My only reason for following this is to make sure my plugins do what is consistent with DVDP. So far, nobody answered my question. I guess I just have to test it myself. Everybody should know where I stand - I pasted actual code, based on what I thought was correct at the time. Only thing I want to know is if in fact the logic is correct (basically, determine SL, DL or XL based on the bytes of data on the disc, regardless of which layer the data resides).

Don't mistake my interest in this as any sort of crusade, proposal, ideology or any such thing. I just want my code to work the way you guys expect it to. Period, end of (my) discussion.
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 Last edited: by mediadogg
DVD Profiler Unlimited RegistrantStar ContributorLithurge
Paralysis by analysis
Registered: March 13, 2007
Posts: 1,279
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Quoting TheMadMartian:
Quote:

I am willing to bet that most of our users fall into this same boat.  I am also willing to bet that this discussion, and proposed fix, will mean very little to the average user.


Something that applies to 99% of the discussions on this board... 
IVS Registered: January 2, 2002
DVD Profiler Unlimited RegistrantStar ContributorNexus the Sixth
Contributor since 2002
Registered: March 13, 2007
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Quoting mediadogg:
Quote:
Only thing I want to know is if in fact the logic is correct (basically, determine SL, DL or XL based on the bytes of data on the disc, regardless of which layer the data resides).


I believe this is how DVDP does it, but it is not a fool proof method since there is no requirement for the first layer to be full before the second is used.
First registered: February 15, 2002
DVD Profiler Unlimited RegistrantStar ContributorKulju
Registered: March 14, 2007
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Quoting Grendell:
Quote:
There is NO useful reason whatsoever for the end user to know that a single layer Blu-Ray movie disc is actually stored on a BD-ROM that is dual layer, but the second layer is not used.

What usefull reason there is to know how much data the disc contains? People seem to think that more data equals better picture quality, but that isn't necessarily true. There are several variables which have an effect on picture/sound quality, for example video/audio bitrate, codec used for video/audio, amount of audio tracks, amount of extras etc. If we don't use dual layer info field just to define whether the disc has one or more layers (empty or not), why do we need at all? What usefull info does it tell us? 

Quote:
If a user is going in and changing profiles to dual layer if there is a second unused layer (however on Earth they are determining that)


By using correct a software for that function like VSO Inspector.
DVD Profiler Unlimited RegistrantStar ContributorLithurge
Paralysis by analysis
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Quoting Kulju:
Quote:

. If we don't use dual layer info field just to define whether the disc has one or more layers (empty or not), why do we need at all? What usefull info does it tell us? 


If we do use it to tell us whether something is dual layer, regardless of use of the second layer or not, what use is this info?
IVS Registered: January 2, 2002
 Last edited: by Lithurge
DVD Profiler Unlimited RegistrantStar ContributorNexus the Sixth
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Practical use, I would say almost none.
First registered: February 15, 2002
DVD Profiler Unlimited RegistrantGrendell
One disc at a time...
Registered: May 8, 2007
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Quoting Kulju:
Quote:
If we don't use dual layer info field just to define whether the disc has one or more layers (empty or not), why do we need at all? What usefull info does it tell us?


Gee you're right. Ken, please remove the single/dual layer field from DVD Profiler.
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DVD Profiler Unlimited RegistrantMark Harrison
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Registered: March 13, 2007
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Since this conversation is starting to turn nasty, this should be my last comment on the topic.  Everything that follows this is MY OPINION.

I have a problem using a filed called Dual-Layer for any purposes besides telling me how many layers the disc contains.  The field should NOT be re-appropriated to store any other data besides the number of layers the disc has.  And since we're only tracking the number of layers (it's not measured in GB), it works out to be very simple.

I'm hearing that other people don't like this; I guess they must use that information for other purposes.  And I'm fine with that.  But get a new field for whatever it is you're wanting to track.  This one already has a pretty clear definition, the number of layers on the disc.  If you want to use that number to infer some other attribute of the disc, that's fine.  If you want to put something other than the correct number of layers there because it's causing you to infer things incorrectly, get a new field and leave this one alone!  We DO have a feature request forum.

Finally, if you see no reason for doing things the way we are, too bad.  Unless you're Ken, you're understanding isn't a requirement. Just because *YOU* see no value in it doesn't mean others agree with you or that your limited understanding is correct.  Nor should your lack of understanding prevent those who do get it from discussing the topic.  Don't like the discussion?  Don't read it.
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