This might be considered insane to most people, but YouTube is now supporting 8K video resolution, also known as 4320p. This is an ultra high definition resolution of 7680 × 4320 (33.2 megapixels).

Update: Google responded to our request for comment by saying that 8K video has been supported since 2010, but that labeling for 8K video (the 4320p/8K quality setting like pictured above) was added ...