Patent ID: 9071837
Filing Date: 2015-06-30
Classification: H04N

Abstract:
1. A transcoder for converting a first stream into a second stream, comprising: a period determination part configured to determine a control unit time; a part configured to acquire a bit rate of the first stream per the determined control unit time; a quantization step value calculation part configured to calculate a quantization step value of the second stream by using information on the first stream including the acquired bit rate of the first stream per the control unit time; and a period conversion factor calculation part configured to calculate a period conversion factor α said period determination part determines each control unit time so that a ratio of I picture frames included in each control unit time becomes not more than a predetermined ratio, and said quantization step value calculation part includes a part that is configured to calculate the quantization step value of the second stream of the (N+1) period by multiplying a quantization step value of the first stream in the (N+1) period by said period conversion factor.