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YouTube originally offered videos at only one quality level, displayed at a resolution of 320×240 pixels using the Sorenson Spark codec (a variant of H.263), [29] [30] with mono MP3 audio. [31] In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones. [ 32 ]
HDR video refers to a video encoded in an HDR format. Thoses HDR video have a greater bit depth, luminance and color volume than standard dynamic range (SDR) video which uses a conventional gamma curve. [22] On January 4, 2016, the Ultra HD Alliance announced their certification requirements for an HDR display.
HLG format is an HDR format that can be used for video and still images. [ 26 ] [ 27 ] It uses the HLG transfer function, Rec. 2020 color primaries, and a bit depth of 10 bits. [ 28 ] The format is backwards compatible with SDR UHDTV , but not with older SDR displays that do not implement the Rec. 2020 color standards.
A YouTube video statistics with VP9 video codec and Opus audio codec A main user of VP9 is Google's popular video platform YouTube , which offers VP9 video at all resolutions [ 52 ] along with Opus audio in the WebM file format, through DASH streaming .
Researchers at NHK also developed a high-quality up-converter, which estimates the other two color components to convert the output into full resolution video. [ 51 ] Also in May 2012, NHK showed the ultra-high-definition imaging system it has developed in conjunction with Shizuoka University, which outputs 33.2-megapixel video at 120 fps with ...
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
The dynamic range that can be perceived by the human eye in a single image is around 14 stops. [10] SDR video with a conventional gamma curve and a bit depth of 8-bits per sample has a dynamic range of about 6 stops, assuming a luminance quantisation threshold of 5% is used. [10]
Dolby Vision is a set of technologies developed by Dolby Laboratories for high dynamic range (HDR) video. [1] [2] [3] It covers content creation, distribution, and playback.[1] [4] [5] [6] It includes dynamic metadata that define the aspect ratio and adjust the picture based on a display's capabilities on a per-shot or even per-frame basis, optimizing the presentation.