Adaptive rate control for encoding of variable frame rate video sources
US8295344B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2007 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Aug 23, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and apparatuses for performing rate control for encoding of video frames are provided. A first timestamp is received that indicates a capture time for a prior video frame. A second timestamp is received that indicates a capture time for a current video frame. A time difference between the second timestamp and the first timestamp 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 video data bits that have been encoded is received. The number includes 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. A virtual buffer fill level is adjusted based on a difference between the indicated number of video bits that have been encoded 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.