SD Blu-ray
SD Blu-ray disc is a Blu-ray disc on which the video is typically standard-definition television quality but the audio tracks can be 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[by whom?] 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 it is also possible to provide lossless audio.[1] In most instances, SD on Blu-ray titles reuse previous DVD mastering and are done for the convenience of having content that would otherwise span many DVDs on substantially fewer Blu-ray discs.[2](e.g. The "SD on BD" release of Samurai Pizza Cats has all 52 episodes on a single disc rather than the 8 discs of previous DVD releases.)[3]
An example of an SD Blu-ray disc is Live at the Rainbow '74 by Queen. The visual content, filmed for TV in 1974, 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
- ^ "What Is SD Blu Ray". forum.blu-ray.com. Blu-ray.com. 2013-06-09. Retrieved 2014-10-13.
- ^ Animeigo Sweet Spots March 31, 2015
- ^ Samurai Pizza Cats - 'The Complete Collection SD-on-BD': DVD Quality, But On a Blu-ray Disc