Why are there moving black bars on the sides of some 3D discs?

[that1guystudios]

Originally Posted by JediFonger

just like a confirmation if every BD3D will have this. i will want to own the 2D and BD3D if that is the case. i view BDs on my HTPC and there is no overscan there... so i WILL notice this annoying issue and yes i'm freakin' OCD TO THE MAX!

i'm pissed that BD3D consortium didn't think about this whole thing thoroughly, so as to stabilize the black lines

It has nothing to do with the format of the disc, or stabalization of the black lines. It is part of the film itself. You can crop the black bars off, but you lose some image. If you turn the 2D to 3D conversion on in a Samsung TV it adds black bars to the sides that move in and out based on depth. The bars move the depth plane in and out of the TV. You have to have a stopping point for the picture outside of the last pixel on the TV or you lose depth perception.