Patent ID: 9374408
Filing Date: 2016-06-21
CPC Classification: H04L,H04N

Claim Text:
1. A content server, comprising: a first encoding unit for generating a first encoding video by encoding an original video at a constant bit rate; a second encoding unit for setting a Group Of Picture (GOP) and a frame rate so that a second encoding video is encoded in 1/N of a length of a GOP and at 1/N of a frame rate of the first encoding video and generating the second encoding video by encoding the original video with a quantization parameter constant for the entire original video; a streaming video generation unit for generating a streaming video using the first encoding video and the second encoding video; a video download unit for downloading the first encoding video; and a video streaming unit for transmitting the streaming video in real time, wherein the streaming video generation unit compares frames of the first encoding video with frames of the second encoding video and generates a preliminary streaming video by selecting a frame of the first encoding video if frames are identical with each other and selecting one of a frame of the first encoding video and a frame of the second encoding video if the frames are not identical with each other, and wherein the streaming video generation unit predicts structural similarity values when transmitting a frame of the first encoding video and a frame of the second encoding video as the streaming video and generates the preliminary streaming video by selecting the frame of the first encoding video if a difference between the predicted structural similarity values is a threshold or lower and selecting the frame of the second encoding video if a difference between the predicted structural similarity values exceeds the threshold.