by manipulating the video tags using the code "yt3d:enable=true" Ive found i can open the 3d available and all features settings on all videos including Swapping the left and right sources for fixed anaglyph modes. The only issue im running into is centered zooming with 3d tags the picture below is a good reference, on the left the aspect is correct with no zoom(though i clipped the left side in paint oops). on the right centered zooming(not good). I having plenty of tag codes in use to try and fix this now, but I'd like to have a good idea where to start. starting from the top of this page the page is a good reference. https://productforums.google.com/forum/#!topic/youtube/fTEyR0GeSiw a video of it actually working
I'm not sure why you'd need to do this. For my YouTube account I have all the 3D options available in the 3rd tag. The area where you enter the date of recording and place. The 3D video options are below that.
Not to long before i saw your post i tried that method and still same conclusion, madmatt at world of longplays or AmigaOmega on Youtube got his Hyper Zone video to work with some tags along the lines of "yt3d:left=0_0.1_0.5_0.9 and yt3d:right=0.5_0.1_1_0.9" i sent a message so hopefully i can fix the problem *scratches head*
