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Youtube Video Quality and formats !

Youtube Video Quality and formats

Initially, YouTube only offered videos with a quality level displayed at a resolution of 320 × 240 pixels, using the Sorenson Spark codec (option H.263),  with mono MP3 audio.  In June 2007, YouTube added the ability to view 3GP videos on mobile phones. [89] In March 2008, a high-quality mode was added that increased the resolution to 480 × 360 pixels.  In November 2008, support for 720p HD was added. When the 720p player was launched, YouTube changed from 4: 3 to 16: 9 widescreen. [91] With this new feature, YouTube started switching to H.264 / MPEG-4 AVC as the standard video compression format. In November 2009, support for 1080p HD was added. In July 2010, YouTube announced that it has released a series of 4K videos that allow it to resolve up to 4096 × 3072 pixels.  In June 2015, support for 8K resolution was added, and the video was played at a resolution of 7680 × 4320 pixels. In November 2016 support was added for HDR video that can be encoded with Hybrid Log Gamma (HLG) or Perceptual Quantizer (PQ). HDR video can be encoded with Rec. 2020.

In June 2014, videos at 60 frames per second appeared on YouTube to play video games at a frame rate comparable to high-performance video cards.  Videos are played at a resolution of 720p or higher. YouTube videos are available in different quality levels. Previous Standard Quality (SQ), High Quality (HQ), and High Definition (HD) titles have been replaced by numeric values ​​representing the vertical resolution of the video. The streaming video stream is encoded in VP9 format with opus stereo sound. If VP9 / WebM is not supported in a browser / device or in Windows XP user agent reports, AVC H.264 / MPEG-4 video with AAC stereo sound will be used instead.