![]() Similarly, screen images mirrored from Android devices are typically degraded, reflecting the fact that video displayed on the smaller screens of tablets and smartphones is usually downscaled. Content that uses plug-ins, such as Silverlight and QuickTime, does not fully work, as the stream may lack sound or image. In the case of "tab casting", the quality of the image depends on the processing power of the device, and minimum system requirements apply to video streaming. Content can also be mirrored from a tab of the Chrome browser (with the Cast extension) on a personal computer or from the screen of some Android 4.4+ devices.Streamed content can be Internet-based, as provided by specific apps, or reside on the sender device's local storage. Mobile apps enabled for Google Cast are available for both Android 4.1+ and iOS 7.0+ web apps enabled for Google Cast are available on computers running Google Chrome version 72 or later (on Microsoft Windows 7+, macOS 10.7+, and ChromeOS) through the installation of the "Cast extension" in the browser. Google Cast receiver devices stream the media from the web within a local version of the Chrome browser, thus freeing the sender device up for other tasks, such as answering a call or using another application, without disrupting playback. The primary method of playing media on the device is through Google Cast–enabled mobile and web apps, which control program selection, playback, and volume.In both cases, playback is initiated through the "cast" button on the sender device. Google Cast receivers can stream content via two methods: the first employs mobile and web apps that support the Google Cast technology the second allows mirroring of content from the web browser Google Chrome running on a personal computer, as well as content displayed on some Android devices. As of October 2017, over 55 million Chromecasts and Chromecast built-in devices have been sold. ![]() ![]() Consumer devices that natively support the protocol are marketed as Chromecast built-in. Support for Google Cast has since been integrated into subsequent devices, such as the Nexus Player and other Android TV devices (such as televisions), as well as soundbars, speakers, and later models of the Chromecast. According to Google, over 20,000 Google Cast-ready apps were available as of May 2015. The Google Cast SDK was released on February 3, 2014, allowing third parties to modify their software to support the protocol. The protocol was first launched on July 24, 2013, to support Google's first-generation Chromecast player. The protocol is used to initiate and control playback of content on digital media players, high-definition televisions, and home audio systems using a mobile device, personal computer, or smart speaker. Google Cast is a proprietary protocol developed by Google for playing Internet- streamed audiovisual content on a compatible consumer device.
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