you can download the content from youtube using: IDM
also download: STEREOSCOPIC PLAYER
the steroscopic player has features there to output all kinds of 3d pictures, side by side, top/bottom,interlaced as a one 3d picture.
when you use the player, you DONT need to choose sbs on your tv becuase the STEROSCOPIC player already does it for you.
the only thing you need to care for now is for the right resolution,
set the windows resolution to the native resolution of your 3dtv,
your graphic card needs to support it, but all graphic cards now days support hd res.
this is also true if you would like to play games in 3d with your 3dtv
you just use a program like tridef that translate the images to one 3d image,
and again no need to choose 3d setting on your tv like sbs feature because the tridef is the player in that case.
you can also use tridef on a non 3dtv, just choose the output to anaglyph and use red/cyan glasses which is inferior pic quality,
but you still get the 3d.