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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]
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 .
Video quality can be evaluated objectively (by mathematical models) or subjectively (by asking users for their rating). Also, the quality of a system can be determined offline (i.e., in a laboratory setting for developing new codecs or services) or in-service (to monitor and ensure a certain level of quality).
Users could view 4K video by selecting "Original" from the quality settings until December 2013, when the 2160p option appeared in the quality menu. [79] In November 2013, YouTube began to use the VP9 video compression standard, saying that it was more suitable for 4K than High Efficiency Video Coding (HEVC). Google, which owns YouTube ...
[citation needed] Also the size recommended for "medium" quality MMS videos. [citation needed] 144p 144p 192×144 27,648 4:3 The resolution 192×144 is used when 144p is selected on a fullscreen YouTube video. [citation needed] YouTube 144p 144p 256×144 36,864 16:9 One tenth of 1440p. The lowest resolution on YouTube since 2013. [10] QnHD 180p ...
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Each of these steps is subject to deliberate or unavoidable loss of quality. To retain that quality in the final image, it is desirable to eliminate as many of the encoding/decoding steps as possible. S-Video is an approach to this problem. It eliminates the final mixing of C with Y and subsequent separation at playback time.