Adaptive rate control for encoding of variable frame rate video sources
US9191675B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Nov 17, 2015 |
| Priority date | — |
| Expiry date | Dec 2, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques for performing rate control for encoding of video frames are provided. A first timestamp that indicates a prior video frame capture time and a second timestamp that indicates a current video frame capture time are received. A time difference between these timestamps is determined. An average video data bit encoding rate is multiplied by the determined time difference to calculate a bit budget. An indication of a number of encoded video data bits of the prior video frame and of any further video frames encoded subsequent to the prior video frame and prior to the current video frame is received. A virtual buffer fill level is adjusted based on a difference between the indicated number of encoded video bits and the calculated bit budget. A quantizer parameter is adjusted based on the adjusted virtual buffer fill level. The current video frame is encoded according to the adjusted quantizer parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.