Issue: Many of the “SBS 3D video” clips available on YouTube are in a fixed or messed-up 16:9 format for the combined image in full screen mode:
..which, when in activated SpatialLabs Go side-by-side 3D mode, do get a 3D image with wrong Aspect Ratio:
Solution: As long as there is no Aspect Ratio setting in SpatialLabs Go, you may search and install the Browser Add-on ”Ultrawidify” (available for Firefox, Edge and others):
..and set it to Streching mode “Basic”
..which will stretch the video into the Fullscreen 3D image Aspect Ratio for SpatialLabs Go:
Additional tip: Since all the processing and stretching of high-resolution videos may sometimes lead to stuttering playback, you may assign your browser executable (here it's for Microsoft edge) file to use Nvidia GPU graphics (High Power):
Have fun and enjoy 3D even more with your Acer SpatialLabs device!