Before 3D TVs, 3D movies were viewed on 2D TVs and monitors using compatible special glasses. Movies were played with a single alignment in both horizontal and vertical directions. Most 2D TVs were unable to display 3D material and were converted to the "Flat" mode.
Before Blu-ray, high-definition video was encoded in "16 to 9" television standard, which is encoded using 525i (16:9 aspect ratio, 525 lines, interlaced). This was the standard for VHS tapes (whereas the standard for DVD was 625i), but HDTV cameras shoot 720p (WXGA, 1,080 lines, progressive). The standard for Blu-ray is 1080i, which can handle 2,000i (a typical movie has a resolution of approximately 2,400i, which can display 3,200i using the Blu-ray format) but, of course, has a much larger footprint since it can provide 3-dimensional image quality. It also allows for new ultra HD UHDTV (HEVC) 4K video capability.
SBR (Stereo Broadcast Recommended) is a stereo broadcast standard for stereo audio. SBR is limited for purposes of broadcasting. (It's a rough approximation if it's converted to stereo in the room in which it's being listened to.) SBR was specified for World Wide Web site or streaming audio. d2c66b5586