Factory Pressed DVD9 - Physical Split Point Risk

Hello, i've sent a DVD9 project to a factory for replication and they've come back with the following:

The split point on layer 0 and 1 is not exactly on the physical split point. If we proceed to production, there may be a risk of not playable in some players. Would you like us to proceed?

If you’re going to re-supply new master, can you supply master in two discs consists of Layer 0 and Layer 1.

Is there a significant difference between the way a home burned DVD9 works and a professionally factory created one? The project, tBSWM, has not received any play back problems. So i'm wondering how big of a concern this is. Is this issue more for very, very old DVD players?

The factory mentioned that the split point is not at the physical split point is the issue unfamiliar to me.

If this is a representation of the disc: (* = content , _ = unused disc space)

Layer 0 - Currently Authored
********************---
Layer 1 - Currently Authored
---******************---

Does this mean that the factory pressing would look like this.

Layer 0 - Factory Pressed
___*********************
Layer 1 - Factory Pressed
______******************

So if I resubmit as two DVD5, doesn't that screw up the Catalog track? Since the sectors would all now be shifted into a new location? Would they create a new catalog track? doesn't sound possible without reauthoring.

Anyone worked with CMF, Cutting Master Format? the DVDStudioPro book mentioned it. Have asked the factory if they work with CMFs.

What would you all recommend to do with this question?
thanks
none

***EDIT***

Found this: http://www.discmakers.com/authoring/source-dvd9.asp

and these paragraphs begin to explain some of the issues:

Creating a DVD with maximum compatibility involves more than just building your DVD and burning it to a DVD-(+)R. This is especially true when creating a DVD-9 master. The outside edge of a DVD disc is the most difficult part for the DVD player to read. For this reason the DVD Specification, which outlines rigorous standards for Data on and the physical makeup of DVD discs, specifies how far towards the outer edge of the disc data can be written. The exact specification is 58mm from the inside of the disc (or a 58mm radius). Any data written outside the 58mm radius may cause the DVD to skip, stutter, or not play beyond that point. When supplying a DLT tape or DDP on DVD master, this is not an issue, because you can control where the layer break occurs. However, supplying your master on a DVD-+(-)DL can be problematic. Originally the DVD-DL conformed to the 58mm radius specification. However, in an attempt to put more data on a DVD-DL, manufacturers have pushed beyond the 58mm restrictions and allow data to be written further towards the edge of the disc. This may result in a disc that fails due to the aforementioned issues.

So how do you ensure this won’t happen? The absolute best method for supplying a DVD-9 master to your replicator is on 2 DLT tapes (1 tape per layer) or DDPs on 2 DVD-R 5s. DLT tapes contain DDP (Data Description Protocol) files, a file format utilized by disc manufacturers to make a glass master. The DDP contains all the assets and information about the DVD including *region codes, copy protection, and layer break information something a DVD-DL will not contain. *(Read the sidebar on Region codes and copy protection on recordable DVDs). DVD authoring applications may have the ability to write to DLT tapes but requires purchasing a DLT machine. There are limitations to the type of machine and tape a replicator will accept. Best practice is to always call and find out their specific requirements. If you do not want to go the route of a DLT, with DVD Studio Pro™ you can write DDP files to DVD+(-) R discs. These DDPs are the same files you would write to a DLT. As with a DLT, a DVD-9 will require 2 DDPs on Discs one for each layer. Check with your replicator to see if they accept DDPs on disc and for their specific submission requirements.

Another but somewhat less reliable way to supply your DVD-9 master is on a DVD+(-)DL. Previously the only way to submit a DVD-9 master to a replication facility was on a DLT (Digital Linear Tape). But within the past few years, facilities have been accepting Dual layer recordable DVDs. These discs may or may not produce a suitable master. It’s important to understand that layer break information formatted in programs such as DVD Studio Pro™ do not carry over when burned to a DVD-DL (unlike with DDPs). The layer break is controlled by whatever disc burning software you use. Some programs will let you set the layer break and others will simply write to layer 0 until it is filled, then writes the remaining data to layer 1. This may result in data being written outside of the 58mm radius limitation leading to disc failure. If you have burning software that will let you set the layer break, you will need to calculate where the break will happen. For OTP DVDs layer 0 needs to be filled. This translates to 2,085,472 sectors or approx 4.07 GB. Placing the layer break beyond this point will result in violating the 58mm radius limitation.

Thanks for the tips, ended up doing most of what you suggested.

I had sent a dual layer master originally, since i didn't know there was the DDP format.  This was all new to me so made a few blunders but the discs came back and so far they seem fine. 

The press came back asking for new masters, after receiving the dual layer version, so figured out the DDP format, had to rebuild and reformat.  The problem is I couldn't 'play' the DDP files (to preview) so the disc name got screwed up and the DVD_ROM contents ended up in the main directly instead of a DVD_ROM folder.  Hopefully that won't cause playback problems in some players.

The DVDSP manual says very little about these DDP/CMF formats.  DVD-BOY suggested using version 2.0 but my logic might have lead me to use 2.1 (can't remember what i did use...).  Still don't know the specifics of the actual recordable dimension of LAYER0 on normal media and an officially pressed disc.

Finding an accurate split point turned out to be a horror, but eventually found a help suggestion in the tucows forums.  they suggest doing a temp build where you put in as many chapter markers as you can, then when you do the format you can see which markers fall into a practice split point.  Then you rebuild with the markers removed except for one which falls into your desired area.  Thought the short chapters would make for places to assign the split but since the disc was backed tight, ended up having to add a new marker for the split.  Turns out there was just a 15 second window to place the split without rebuilding with different bitrates or moving content between VTSs.

Also phucked up on the cover art, had set up for the font to be clear to the silver disc surface, but checked off the wrong box so they put in a white back surface which filled in the transparency. Pissed off about that...

Turns out even though my contact was in Australia (www.dualplover.com) the disc were manufactured in Taiwan. (http://www.tsti.com.tw/)

If anyone wants one, send a pm.

none

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