Video-based measurement of round-trip latency from user input event to corresponding video output

摘要

An apparatus in one embodiment comprises a client device configured to communicate with a remote system over a network. The client device comprises a processor, a memory, an input device and a display. The client device is configured to detect an input event generated at the input device, to store in the memory a local time associated with the input event, and to transmit information characterizing the input event to the remote system over the network. The client device is configured to receive from the remote system a video signal comprising an event index of the input event. An event index is extracted from the video signal, and a round-trip latency is computed between the input event and a corresponding video output of the client device based at least in part on a local time associated with the extracted event index and the stored local time associated with the input event.