Per-GOP bitrate adaptation for h.264 compressed video sequences

Authors:
Fabio De Vito;Tanir Ozcelebi;Reha Civanlar;A. Murat Tekalp;Juan Carlos De Martin
Affiliations:
Dip. Automatica e Informatica, Dep. of Electrical Engineering, Politecnico di Torino, Koc University, Torino, Sariyer, Istanbul, Turkey, Italy;Dep. of Electrical Engineering, Koc University, Sariyer, Istanbul, Turkey;Dep. of Electrical Engineering, Koc University, Sariyer, Istanbul, Turkey;Dep of Electrical Engineering, Dep. of El. and Comp. Eng., Koc University, Un. of Rochester, Sariyer, Rochester, Istanbul, NY, Turkey;Dip. Automatica e Informatica, Politecnico di Torino, Torino, Italy
Venue:
VLBV'05 Proceedings of the 9th international conference on Visual Content Processing and Representation
Year:
2005

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Abstract

In video transmission over packet data networks, it may be desirable to adapt the coding rate according to bandwidth availability. Classical approaches to rate adaptation are bitstream switching, requiring the storage of several pre-coded versions of a video, or layered (scalable) video coding, which has coding efficiency and/or complexity penalties. In this paper we propose a new GOP-level rate adaptation scheme for a single stream, variable target bitrate H.264 encoder; this allows each group of pictures (GOP) to be encoded at a specified bitrate. We first compare the performance of the standard H.264 rate control algorithm with the proposed one in the case of constant target bitrate. Then, we present results on how close the new technique can track a specified per-GOP target bitrate schedule. Results show that the proposed approach can obtain the desired target rates with less than 5% error.