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Towards bridging online game playing and live broadcasting: design and optimization

Recent years have witnessed the emergence and growth of Cloud Gaming, where players interact with the remote game instance and receive rendered game scenes in video stream. Meanwhile, broadcasting and viewing games through live streaming platforms, e.g., Twitch.tv, have become increasingly popular. The interaction and performance of the many modules involved in this new generation of gaming and streaming platforms have yet to be closely investigated. In this paper, we present an initial experiment-based performance study, in which we profile the architecture of realworld gaming and streaming platforms, namely the Open Broadcast Software (OBS) module and its connection to the Twitch server. Our investigation shows that the recording operation can greatly increase the CPU utilization and the power consumption can increase over 60% on the game streaming computer. The use of advanced hardware encoding found on modern GPUs can greatly alleviate these performance issues. Yet, through profiling, we show that hardware encoding can introduce remarkable delays to the whole pipeline. We track this to a complicated interplay between the CPUs power saving methods and the implementation of hardware encoders.