Transcoder
AssigneeMegaChips Corporation
InventorsHiromu HASEGAWA, Nobuyuki Takasu, Makoto Saito
Life of this patent
Estimating the term…
Abstract
If the number of frames in a GOP of an input stream is not less than 15, the GOP is determined as a control unit time. If the number of frames in the GOP is less than 15, the following GOP is connected thereto until the number of frames becomes not less than 15 and the connected GOPs are determined as a control unit time. After correcting the control unit time, the average input bit rate Sn in each control unit time is obtained, and by using information on the input stream including the average input bit rate Sn, a quantization step value of an output stream is calculated.
Claims23
A transcoder for converting a first stream into a second stream, comprising:
- a period determination part for determining a control unit time;
- a part for acquiring a bit rate of a first stream per determined control unit time;
- and
- a quantization step value calculation part for calculating a quantization step value of a second stream by using information on a first stream including an acquired bit rate of a first stream per control unit time,
- wherein said period determination part determines each control unit time so that each control unit time has frames of which number is not less than a predetermined value.
A transcoder for converting a first stream into a second stream, comprising:
- a period determination part for determining a control unit time;
- a part for acquiring a bit rate of a first stream per determined control unit time;
- and
- a quantization step value calculation part for calculating a quantization step value of a second stream by using information on a first stream including an acquired bit rate of a first stream per control unit time,
- wherein said period determination part determines each control unit time so that the ratio of I picture frames included in each control unit time becomes not more than a predetermined ratio.
Dependencies are inferred from the claim text.