The revolutionary “reinventing the phone” campaigns initiated by Apple. Smartphones nowadays are shipped with multiple microprocessor cores and gigabyte RAMs; they possess more computation power than personal computers of a few years ago. On the other hand, the wide deployment of 3G broadband cellular infrastructures further fuels the trend. Apart from common productivity tasks like emails and web surfing, smartphones are flexing their strengths in more challenging scenarios such as realtime video streaming and online gaming, serving as a main tool for social exchanges. Many mobile social or media applications have emerged, truely killer ones gaining mass acceptance are still impeded by the limitations of the current mobile and wireless technologies, among which battery lifetime and unstable connection bandwidth are the most difficult ones. It is natural to resort to cloud computing, the newly-emerged computing paradigm for low-cost, agile, scalable resource supply, to support power-efficient mobile data communication. The big challenge in front of us is how to effectively exploit cloud services to facilitate mobile applications. There have been a few studies on designing mobile cloud computing systems, but none of them deal in particular with stringent delay requirements for spontaneous social interactivity among mobile users the design of a novel mobile social TV system, CloudMoV, which can effectively utilize the cloud computing paradigm to offer a living-room experience of video watching to disparate mobile users with spontaneous social interactions. In CloudMoV, mobile users can import a live or on-demand video to watch from any video streaming site, invite their friends to watch the video concurrently, and chat with their friends while enjoying the video. Encoding flexibility. Different mobile devices have differently sized displays, customized playback hardwares, and various codecs. Traditional solutions would adopt a few encoding formats ahead of the release of a video program Battery efficiency.
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