Dynamic frame rate control for video streams

ABSTRACT

A mechanism for dynamically varying the frame rate of pre-encoded video clips is described. An off-line encoder creates a high quality bitstream encoded at 30 fps, as well as separate files containing motion vectors for the same clip at lower frame rates. An on-line encoder decodes the bitstream (if necessary) and re-encodes it at lower frame-rates in real-time using the pre-computed, stored motion information. Dynamic Frame Rate Control, used in conjunction with dynamic bit-rate control, allows clients to solve the rate mismatch between the bandwidth available to them and the bit-rate of the pre-encoded bitsream. It also provides a means for implementing Fast Forward control for video streaming without increasing bandwidth consumption.

REFERENCES

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INDEX TERMS

Primary Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)

Additional Classification:
  H. Information Systems
  H.3 INFORMATION STORAGE AND RETRIEVAL

General Terms:
Design, Management, Theory

Keywords:
fast forward control, frame rate control, video streaming