Quote:
|
Originally Posted by berrick
Still confused why with some dvd's there are multiple LB flags ticked in main movie? i dont understand why this tick box is classed as an inverted short cut?
|
Forget the "Layer Break?" flag: it doesn't exist.
Click on the Cell Flags button in PgcEdit. There is a flag called "Seamless playback joint". When it is set, it indicates that the cell must be played seamlessly with the previous one. When it is clear, the player must pauses a little bit (displaying the last image of the previous cell). During the pause, the player has some time to seek to another point on the DVD and to refocus the laser, and to verify if the previous cell has a cell command and execute it.
This flag serves many purposes. It must, for example, be clear on the first cell of a PGC, since it is impossible to play the first cell seamlessly with a nonexistent previous cell. It must also be clear when the previous cell has a cell command, or the command will not be executed.
Among all this stuff, the seamless joint flag must also be clear on the layer break cell.
Therefore, when the seamless flag is clear on a cell in the middle of the main movie, it indicates
probably that it's the layer break position, since there are no other reasons to pause at this point. Hence the "layer break?" pseudo-flag in PgcEdit. It is the inverse of the seamless flag: it is set when the cell is not seamless. In PgcEdit, turning it on has exactly the same effect than opening the Cell Type Flags dialog, and turning off the seamless joint flag.
The "layer break?" pseudo-flag
can indicate the position of the layer break. But it is important to understand that
it is not the layer break.
To be sure that a cell is probably the layer break, it should be non-seamless, the VOB ID of the cell should change and the Cell ID should be 1. The previous cell should not have a cell command. Of course, the cell should be at a place on the DVD where it is physically possible to split the DVD in two layers.
Unfortunately, none of the layer break rules above are always respected. On some DL DVD (Superbit) the seamless flag is even set on the LB cell, to avoid the little pause. (PgcEdit can do that also when burning a DL-DVD.)
Therefore, it is sometimes impossible to determine where the original LB was.
Since the introduction (historically, by IfoEdit) of the "layer break" pseudo-flag seems to be more confusing than useful, maybe I will change it to a "seamless" flag in PgcEdit. It will be a direct shortcut to the seamless joint flag of the Cell Type Flags editor, without the current inversion.