View Single Post
Old 29th September 2009, 09:05   #6  |  Link
r0lZ
PgcEdit daemon
 
r0lZ's Avatar
 
Join Date: Jul 2003
Posts: 7,469
Good question. It has already been discussed here. It is true that most players support putting the layer break in the middle of a cell (but it MUST be at the beginning of a VOBU) but anyway that's out of specs. I think ImgBurn has an option to allow that. Anyway, there is no guarantee that all players (especially the old ones) will accept that. It is always preferable to be spec compliant. That's why there are specs!

It is true also that the only problem to take into account is the delay needed by the laser to focus to the second layer. However, the layer break is not a command. IIRC (but I'm not a specialist of that subject), the data are followed by null bytes, and the mux rate is often different (but that's not a requirement).

Another problem with the LB in the middle of a cell is that you have no way to control its position precisely. You may have a pause in the middle of an important scene. Most software players do not pause at all, but there are still many standalone players that require a pause of 1 or 2 seconds. The pause can even be extremely long if the DL DVD+/-R is not of good quality, or has not been burned correctly, as the player may have trouble to focus on the second layer.

And a DVD-Video MUST be burned as OTP. This is also in the specs.

OTP requires that the room occupied by the first layer be greater or equal than the 2nd layer, but that doesn't mean that the first layer must contain more DATA than the second layer. It is possible to create "gaps" between the files to fill the necessary space, and to place more data on the second layer. It's that technique that is used by PgcEdit and ImgBurn, but, afaik, Nero is not smart enough to do it.
__________________
r0lZ
PgcEdit homepage (hosted by VideoHelp)
BD3D2MK3D A tool to convert 3D blu-rays to SBS, T&B or FS MKV

Last edited by r0lZ; 29th September 2009 at 09:10.
r0lZ is offline   Reply With Quote