Adaptive rate control for encoding of variable frame rate video sources
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United States of America Patent
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Nov 17, 2015
Grant Date -
Mar 7, 2013
app pub date -
Sep 14, 2012
filing date -
Oct 22, 2007
priority date (Note) -
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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.
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