SIGNET SD SET TOP
It is indeed a big confusion for many of the Cable TV customers to choose between a SD (Standard Definition) and a HD (High Definition) Cable TV connection.
An SD stands for Standard Definition and an HD stands for a High Definition. The first video is a standard definition video. It has 352 lines and it’s in widescreen format, made to fit the aspect ratio of old televisions (4:3 aspect ratio).
It was very probably captured from a high-definition source and resized to standard definition so the video file wouldn’t be so large. The compression algorithm used is XviD, and the file (42 minutes of video) weighs in at 350 MB.
The second video is what they call 720p (non-interlaced 720 lines of resolution). It was very likely captured directly from a digital source into a file,then recompressed into h.264 — a more advanced codec than XviD which, if used here, would make the file two to three times larger.
The first video image was resized to match the resolution of the second one, because this is the process your TV would use to show you standard definition.They were subsequently cropped to fit the interesting area because they were huge shots and this Web page isn’t as wide.
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