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SD Blu-ray
SD Blu-ray disk is a Blu-ray disk on which the video is typically standard-definition television quality but the audio tracks typically are HD quality, e.g. Dolby TrueHD.
This is usually because the original content (e.g. a concert, show, or a low-budget film) was shot on standard definition video or in other low-definition format. Thus the original content cannot be presented in high-definition.
It has been said that standard definition content on Blu-ray and standard definition content on DVD do not look the same. This is because compression is far better on Blu-ray, as will naturally be the encoding, and additionally it is also possible to provide lossless audio.
An example of an SD Blu-ray disc is Live at the Rainbow '74 by Queen. The visual content, being filmed for TV in 1974 obviously does not meet normal Blu-ray standards, yet it has been released in that format, allowing for the sound to be reproduced in the best possible way.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「SD Blu-ray」の詳細全文を読む
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