Dual Layer Disc Layer-Break calc. by GEAR

Project size and track path (T. P.) [How to find it in GEAR]
Total volume (project) size (in sectors):		Fill in this value (and further, fill carefully all form fields).
Opposite Track Path (OTP) or Parallel T. P. (PTP) ⁽¹⁾:
Rules. Constant: maximum size of each DVD-9 layer is 2074496 sectors.
This case - for PTP, minimum layer-break point (sector):	1939040	Must be greater than total sectors minus maximum layer size.
This case - for OTP minimum layer-break point (sector):	2006768	Must be greater than half of the total number of sectors.
In this case, layer-break point must be greater than (>): 2006768 and less than (<): 2074496
Find a Video Title Set (VTS_xx_y.VOB) number (xx) which falls within the above range, regardless of the y value.
Chosen Video Object [How to find it in GEAR]
VTS_xx_1.VOB startsector (be careful!):
Find a cell which has an entry point sector in the following range: ⁽²⁾
Chosen cell must have a starting sector address between sector 1767800 and sector 1835528 (in this case).
Within the Video Title Set (VTS) [How to find it in IFOEdit]
Enter the chosen cell address within the VTS (from IFOEdit):
Result:
Your chosen break point is sector:	2044749	Must be divisible by 16 and between the above min. and max. values.
Chosen break point devided on 16 =	127796.8125	ECC Blocks
To align this position with an ECC boundary, move the entire image by	3	sectors (+: forward; -: backward) [How to do it in GEAR]
That shift will give you a revised layer-break point of:	2044752	sector or 127797 ECC Block.

1) OTP is required for DVD-Video when the layer-break will be within a Video Object.

2) Use IFOEdit [download - freeware] to examine VTS_xx_0.IFO. Look at VTS_PGCITI — you may have more than one PGC (program chain). [Sample]

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