Telefonaktiebolaget LM Ericsson (publ)
Video stream synchronization

Abstract:

A system clock reference is transmitted to user devices (1, 2, 3) over a short range communication channel (40) and used to calculated a clock offset. The clock offset is stored together with a user identifier in a server memory (15), from which the clock offset can be retrieved when receiving the user identifier together with a video stream (21, 22, 23) of video frames (31, 32, 33) tagged with respective timestamps. The timestamps are converted into capture times according to a system clock (17) using the retrieved clock offsets. Video streams (21, 22, 23) from multiple user devices (1, 2, 3) thereby have video frames timestamped using a same clock reference and can be time aligned.