A method, computer program, and computer system is provided for coding viewport bitstreams. A first coded video bitstream having a segment size defined for a viewport is encoded based on a threshold corresponding to a user's head movement. A second coded video bitstream having a low resolution is encoded. The second coded video bitstream may correspond to a background having a constant segment duration or size. A streaming bitstream for decoding or rendering is created using the first coded video bitstream and the second coded bitstream.