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2. Ultra HD Blu-ray - Wikipedia

   en.wikipedia.org/wiki/Ultra_HD_Blu-ray

   Ultra HD Blu-ray (4K Ultra HD, UHD-BD, or 4K Blu-ray) [2] [3] is a digital optical disc data storage format that is an enhanced variant of Blu-ray. [4] Ultra HD Blu-ray supports 4K UHD (3840 × 2160 pixel resolution) video at frame rates up to 60 progressive frames per second, [ 4 ] encoded using High-Efficiency Video Coding . [ 4 ]

3. Blu-ray - Wikipedia

   en.wikipedia.org/wiki/Blu-Ray

   Early 4K Blu-ray release at Best Buy. A 4K Blu-ray Disc player was also released. On January 7, 2013, Sony announced that it would release "Mastered in 4K" Blu-ray Disc titles sourced at 4K and encoded at 1080p. [77] "Mastered in 4K" Blu-ray Disc titles can be played on existing Blu-ray Disc players and have a larger color space using xvYCC.

4. Comparison of high-definition optical disc formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_high...

   ^ h Linear PCM is the only lossless audio codec that is mandatory for both HD DVD and Blu-ray disc players, only HD DVD players are required to decode two lossless sound formats and those are Linear PCM and Dolby TrueHD. Dolby TrueHD and DTS-HD Master Audio have become sound format of choice for many studios on their Blu-ray titles but ever ...

5. HD DVD - Wikipedia

   en.wikipedia.org/wiki/HD_DVD

   There are two types of hybrid formats which contain standard DVD-Video format video for playback in regular DVD players, and HD DVD video for playback in high definition on HD DVD players. The Combo disc is a dual sided disc with one side DVD and the other HD DVD, each of which can have up to two layers.

6. DIVX - Wikipedia

   en.wikipedia.org/wiki/DIVX

   The terminology "Open DVD" had been used by DVD supporters and later Sony themselves; [40] in response to DIVX's labeling of DVD as "Basic DVD" and DIVX/DVD players as "DIVX-enhanced". Other retailers, such as Best Buy, also had their concerns, most of them citing possible customer confusion and cumbersomeness with the two formats. [41]

7. DVD region code - Wikipedia

   en.wikipedia.org/wiki/DVD_region_code

   The American DVD Copy Control Association also requires that DVD player manufacturers incorporate the Regional Playback Control (RPC) system. However, region-free DVD players, which ignore region coding, are also commercially available, [2] and many DVD players can be modified to be region-free, allowing playback of all discs. [3]