Originally Posted by tom1996
I recorded the program via my DVR, Scientific Atlanta 8300HD. (I had doubts that the DVR could record and playback 3D but several days ago CableVision assured me it could and that it would not occupy more hard-drive space than a normal HD program. I found that they were correct.) The very-delayed broadcast on Channel 1300 was promoted and mainly sponsored by Panasonic, apparently to promote 3D TVs. I also had the option of recording the 2D broadcast on the regular NBC channel at the same time as it was broadcast in my time zone.
The bottom line is that you are correct, if I want both ways I need to record it both ways.
Now I wonder how it works with a Blu-ray movie. If you buy a 3D version movie for your child and then discover you don't have enough 3D eyeglasses for her and all of her friends, can you play it in 2D and have it look OK?
The cable and satellite systems use a reduced resolution format for 3D that works with regular 2D bandwidth available on those systems.
The Olympics 3D HD feed appears to be 1080i HD side-by-side 3D format on my cable system.
They simply use a regular 1080i HD signal but put the left and right separate images side-by side, so each is effectively half the horizontal resolution or 960x1080.
The 3D TV recognizes this format and displays it in the TV's 3D format, for Panasonic plasmas thats the active 3D format where each eye's image is displayed full screen (scaled up to 1920x1080) for 1/120 sec and then the other eye's image is displayed alternately.
My cable system also provides several 3D on-demand titles, many are free, but in a lower 720p over/under 3D format, where one half image is on top and the other on the bottom in the same frame. Again the 3D TV recognizes this format and switches into 3D mode. But each half-image is effectively only 1280x360 resolution in that format.
Blu-Ray 3D discs however use a different full resolution 3D format that requires a higher bandwidth since it provides full 1920x1080 images for each eye, so effectively twice the rate of 2D 1080p video. This higher bandwidth requirement for full resolution 3D may require better HDMI cables and a newer 3D capable HDMI receiver (if used with a 3D bluray player) too.
A special 3D blu-ray player is required to playback in 3D.
3D blu-ray discs are formatted in such a way they are compatible with and can be played on regular 2D blu-ray players, it will just play in regular 2D in that case - just uses one of the two half images.
3D blu-ray players also can select to play a 3D title in 3D or 2D, my own Panasonic 3D blu-ray player I have setup so it asks you which to use (3D or 2D) at the start of playing a 3D blu-ray disc. Also many 3D blu-ray discs offer the 3D vs 2D choice in the regular disc playback menu system when you select Play Movie.