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BD-R TL and layer breaks

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#1 oglaf


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Posted 19 April 2017 - 08:40 PM



I'm experimenting with making my own higher-resolution discs to the BD ROM4 spec with triple-layer 100 GB capacity discs. Triple-layer discs imply two separate layer breaks. Without going into too many details, setting arbitrary layer breaks is important to me so that I can ensure that content encoded for the highest data rates are in the proper physical location on the burned disc.


I don't have any BDXL hardware or TL media at the moment to test this myself, but does ImgBurn support setting more than one arbitrary layer break based on sector sizes?



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Posted 20 April 2017 - 06:36 AM

You can't move the layer break on BD media like you could with DVD+R DL media. Multi layer BD discs are to be treated like a huge single layer disc.
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#3 oglaf


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Posted 20 April 2017 - 05:25 PM

Thanks to our kind host for the info.


The latest ROM4 specification for UHD discs includes a feature called "dual-zone formatting" where MPEG transport files closer to the outer edge of the disc are allowed to have higher maximum bit rates than content in a region near the center. It does require that mastered discs have layer breaks that might not be at the max sector size.


I know from experience that regular Blu-ray discs (ROM2) could generally accommodate the layer break location being moved to the max sector size of layer 0 unless the project in question had certain rare characteristics such as seamlessly branching content located near the mid-point of the disc. ROM4 dual-zone seems like it's a different beast, at least at this stage of the product lifecycle.


Would anyone else please share your experience with burned UHD dual-zone triple-layer discs that play correctly at >100 Mbps without authoring-assigned layer breaks?

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