Originally Posted by Zodiaque
No, polarised light is really not a probleme here. Polarised light is transparent for eyes if you don't use polarised filter.
2) It wouldn't work for shutter glasses 3D TVs because with a 24 fps 3D encode you aren't showing each source frame just once on the TV. It would keep skipping back frames.
No, it's false. There are not problem with actual passive or active 3D. The only problem could be anaglyph 3D but bluray don't use this old 3D technology.
I wasn't talking about polarized light I was talking about those types of displays - the passive displays - they are always displaying the 2 images as far as I know (left+right).
ie on a passive display in 3D mode half the lines/pixels are always displaying the left eye image, and the other half always displaying the right eye ones.
Since they don't flick between the two (unlike active) it won't work for 48 fps 2D.
For active (shutter glasses), like I said it wouldn't work for 48 fps 2D because they output at something like 120Hz (60 images per eye) not 48 Hz.
So the sources images for each eye would be shown multiple times. eg. L1, R1, L1 again, R1 again, before moving to the next source frame.
So if you wanted 48 fps of normal 2D and encoded it as 3D 24 fps, it would keep going back when shown on the active 120Hz display:
eg. 1,2,1,2....3,4,3,4, etc.
If you don't believe me, you can try it. Encode 48 fps 2D video (with a frame counter on screen) into a stereoscopic 3D 24 fps video, and display it on an active display in 3D mode. Record it on a high frame rate camera/camcorder and see what the frame counter shows as well the motion in the video.
Like I said, it should work for 120 fps 2D content though, if you encoded it at 720p60 in 3D, and use an active 3D display which outputs at 120Hz (60 images per eye).