I realized last night that the 4K 3D videos I posted on Youtube are the world’s first ever Civil War era battle re-enactments posted online in 4K 3D format. Kind of cool.
The videos were created using dual Lumix GH-2 cameras, each shooting a 1920×1080/30p video stream.
These were edited and mastered in Sony Vegas Pro and output as full width side by side videos – meaning 3840 pixels wide by 1080 high.
This is then uploaded to Youtube with several “tags” set to tell Youtube how to encode the video properly. When viewed on Youtube, two new viewing resolutions appear: 1440 HD and 2160 4K. Even if you only have a typical 2K monitor, either of the higher resolutions looks much, much cleaner in 3D!
Important – This remains experimental! I can only view the videos in correct format using Firefox. Chrome tells me I do not have HTML5 compliant hardware. I could play all but one video on an LG 3D TV using the LG Youtube app. However, when I played the videos on the same TV using a Sony BluRay player’s Youtube app, the videos have the wrong aspect ratio (3840×1080 instead of 1920×1080). A separate video I mastered as 3840×2160 side-by-side 3D did better, but means I have to double the file size (data rate) to get the same image quality.
We can argue about whether or not paired 2K streams are really 4K video. In one sense, they are half vertical resolution 4K. But when 4K is used to stream 3D, we end up with half size images on the left and right anyway. The effect is therefore the same in terms of what gets delivered.
Additionally, Digital IMAX theaters, as of now, are thought of as 4K theaters but they use dual 2K projectors (they will be upgrading the theaters eventually). Digital IMAX provides a more immersive and louder sound experience, but the Digital IMAX screens are just a little bigger than regular movie screens – and not like the 70 to 90 foot tall original IMAX screens.
In other words, dual paired 2K streams used for 4K 3D end up being roughly equivalent to having been shot in 4K on both cameras due to how the 3D left/right pair has to split the 4K image anyway.