This allows room for certain filtering artifacts (e.g. edge ringing) from old-school hardware filters to occur without being noticeable to the user. But unfortunately it retained the notion that pixel aspect ratio depends on encoded image size. All analog equipment cares about is that the video doesn’t get squished or stretched in one direction, and stays centered.
Makes hardware cheaper.The term «clean aperture» does not refer to: The «Safe Action» and «Safe Title» areas defined in SMPTE RP 27.3-1989. The region of the video raster that is free from half-lines. Well, it turns out that video is much more complex than just that, and it is absolutely crucial to understand certain additional videosyncrasies in order to write video capture, editing, processing, or playback software that does not cause bugs and compatibility problems for end-users. Если вы обнаружили, что нужная вам инструкция по эксплуатации еще не внесена в наш каталог, закажите ее нам. You’ll just be able to think of HD as field or frame images. Ok, ok, stop laughing. You may have to contact the manufacturer to find this out. Many thanks to those who have provided valuable info, including Charles Poynton and Bob Williams.
But it’s not really 60 and it’s not really 59.94—it’s actually 60/1.001, for astounding historical reasons that go back to the 1950s standardization of color NTSC TV and still haunt us today. For example, every 480i frame has lines numbered from 1 to 525, regardless of whether it’s expressed as an analog (NTSC) video signal or a digital (SDI) video signal. However, being pesky video engineers, the authors of ITU-R BT.601-4 clear forgot to mention exactly what the pixel aspect ratios of those pixels was, exactly. You may cross-reference these documents by product description or market application — Commercial/Residential. If you are looking for spec documents, please request access to our Product Catalog.