TOWARDS THE INSTANT TILE-SWITCHING FOR DASH-BASED OMNIDIRECTIONAL VIDEO STREAMING: RANDOM ACCESS REFERENCE FRAME

In this work, we propose an instant tile-switching mechanism for the tile-based omnidirectional DASH video streaming, which solves the problem that the client cannot switch to the high quality tiles immediately as the viewport changes. More specifically, we present the random access reference frame (RARF) on the server for each P frame as the random access point. When users change the viewport, the corresponding P frame at the viewport change moment will be replaced by RARF to transferred to the client for an immediately quality switching. By using the proposed instant tile-switching mechanism, the client can acquire the high quality video in the new viewport at any time and provide users a much better quality of experience.