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InvisibleRandalFlagg
Stranger
Registered: 06/15/02
Posts: 15,608
DVD questions
    #5496016 - 04/09/06 09:22 AM (17 years, 9 months ago)

1. Why do all DVD's have one spot where it pauses for about a second and then continues?

2. Why does my TV sound fine on 10 volume when watching cable, but I need to turn it up to 30 volume when watching a DVD?

3. Do you guys actually watch the extras/special features that are included with DVD's? I know I sure as hell don't.


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Offlinedarkfly
LysergicExperimenter

Registered: 09/16/01
Posts: 1,169
Last seen: 8 years, 5 months
Re: DVD questions [Re: RandalFlagg]
    #5496033 - 04/09/06 09:32 AM (17 years, 9 months ago)

1.) This is most likely due to your player when the DVD is switching from Layer 0 to Layer 1. Not all players do this.

2.) This is most likely due to a DVD being encoded in DD5.1 - I know on my receiver I need to add another 20dB when watching DD5.1 encoded content.

3.) Sometimes.


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Everything Is Blue In This World. The Deepest Shade Of Mushroom Blue.


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InvisibleDieCommie

Registered: 12/11/03
Posts: 29,258
Re: DVD questions [Re: darkfly]
    #5496350 - 04/09/06 11:59 AM (17 years, 9 months ago)

I recently encountered a DVD that DVD shrink couldnt decrypt, whats up with that?


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InvisibleRandalFlagg
Stranger
Registered: 06/15/02
Posts: 15,608
Re: DVD questions [Re: darkfly]
    #5496436 - 04/09/06 12:31 PM (17 years, 9 months ago)

Quote:

darkfly said:
1.) This is most likely due to your player when the DVD is switching from Layer 0 to Layer 1. Not all players do this.




Weird. This isn't some Wal-Mart cheapie DVD player. It's a Sony 5 disc DVD/CD player.

Edit: I found the following on some DVD FAQ

Some movies, especially those over two hours long or encoded at a high data rate, are spread across two layers on one side of the disc. When the player changes to the second layer, the video and audio may freeze for a moment as the laser refocuses and finds its place. The length of the pause depends on the player and on the layout of the disc. The disc producer usually tries to choose a point where the pause will be less noticeable. The pause is not a defect in the player or the disc. See 1.18 for more information.

Are there players that manage not to have this pause moment?


Edited by RandalFlagg (04/09/06 12:34 PM)


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OfflineSeussA
Error: divide byzero

Folding@home Statistics
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 2 months, 20 days
Re: DVD questions [Re: RandalFlagg]
    #5496896 - 04/09/06 03:11 PM (17 years, 9 months ago)

> I recently encountered a DVD that DVD shrink couldnt decrypt, whats up with that?

Each DVD has a block of keys known as player keys. Each DVD player model is assigned a player id by the DVD standard folks. When a DVD player negotiates with the DVD to obtain the keys needed to decode the stream, it verifies that the player id is one of the valid player keys on the DVD. This allows the studio to revoke the ability of a DVD player to decode a disc should a key somehow be cracked.

Of course, the cat has long been out of the bag. The encryption used to scramble DVD content is buggy. Do to lack of understanding of basic cryptography on the part of the designers, the entire player key space has been decoded. Although all player keys are known, most non-DVD-branded DVD software is based off of the same library code... and the library code only uses a few player keys rather than the entire list. My guess is the studio revoked the player key on the disc for the set that your program uses.

> Are there players that manage not to have this pause moment?

Yes, they use a large buffer to hold enough decoded data to keep the video rolling while the laser seeks to the next layer.

> 2. Why does my TV sound fine on 10 volume when watching cable, but I need to turn it up to 30 volume when watching a DVD?

Make sure you don't have dynamic compression turned on. This is usually an option for most DVD players. Also, make sure you aren't using any cinema settings. Finally, make sure that whatever audio track you have selected is appropriate for your receiver.


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InvisibleRandalFlagg
Stranger
Registered: 06/15/02
Posts: 15,608
Re: DVD questions [Re: Seuss]
    #5496916 - 04/09/06 03:16 PM (17 years, 9 months ago)

Quote:

Seuss said:
> Are there players that manage not to have this pause moment?

Yes, they use a large buffer to hold enough decoded data to keep the video rolling while the laser seeks to the next layer.




Can you give me some models that have this "no layer change pause" ability?


Quote:

Seuss said:
> 2. Why does my TV sound fine on 10 volume when watching cable, but I need to turn it up to 30 volume when watching a DVD?

Finally, make sure that whatever audio track you have selected is appropriate for your receiver.




Actually, my DVD player is running right into my TV. There is no stereo receiver in my setup at the moment.


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OfflineSeussA
Error: divide byzero

Folding@home Statistics
Registered: 04/27/01
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Re: DVD questions [Re: RandalFlagg]
    #5498870 - 04/10/06 04:43 AM (17 years, 9 months ago)

The only hardware one that I know of is made by Denon, and is very expensive, but one of the best DVD players on the market. Expensive, as around $1000. This is the only player that I have used that I ave never seen a layer pause when watching movies:

http://www.usa.denon.com/ProductDetails/379.asp

Look at the tech specs, the line of importance is: Buffer Memory to decrease Layer change. You need something in the 6MB to 10MB range to completely avoid most pauses during layer switching. Typical DVD players will have around 2MB. I think Denon has a $750 player that has 8MB of buffer as well.

(I am a huge fan of Denon equipment. In my opinion, they make some of the absolute best audio/video hardware available. It can be an expensive hobby.)


--------------------
Just another spore in the wind.


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