Programming Cell/BE and GPUs systems for real-time video encoding

Svetislav Momcilovic; Leonel Sousa

doi:10.1117/12.851365

4 May 2010 Programming Cell/BE and GPUs systems for real-time video encoding

Svetislav Momcilovic, Leonel Sousa

Proceedings Volume 7724, Real-Time Image and Video Processing 2010; 772407 (2010) https://doi.org/10.1117/12.851365
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

In this work scalable parallelization methods for computing in real-time the H.264/AVC on multi-cores platforms, such as the most recent Graphical Processing Units (GPUs) and Cell Broadband Engine (Cell/BE), are proposed. By applying the Amdahl's law, the most demanding parts of the video coder were identified and the Single Program Multiple Data and Single Instruction Multiple Data approaches are adopted for achieving real-time processing. In particular, video motion estimation and in-loop deblocking filtering were offloaded to be executed in parallel on either GPUs or Cell/BE Synergistic Processor Elements (SPEs). The limits and advantages of these two architectures when dealing with typical video coding problems, such as data dependencies and large input data are demonstrated. We propose techniques to minimize the impact of branch divergences and branch misprediction, data misalignment, conflicts and non-coalesced memory accesses. Moreover, data dependencies and memory size restrictions are taken into account in order to minimize synchronization and communication time overheads, and to achieve the optimal workload balance given the available multiple cores. Data reusing technique is extensively applied for reducing communication overhead, in order to achieve the maximum processing speedup. Experimental results show that real time H.264/AVC is achieved in both systems by computing 30 frames per second, with a resolution of 720×576 pixels, when full-pixel motion estimation is applied over 5 reference frames and 32×32 search area. When quarter-pixel motion estimation is adopted, real time video coding is obtained on GPU for larger search area and on Cell/BE for smaller search areas.

Citation Download Citation

Svetislav Momcilovic and Leonel Sousa "Programming Cell/BE and GPUs systems for real-time video encoding", Proc. SPIE 7724, Real-Time Image and Video Processing 2010, 772407 (4 May 2010); https://doi.org/10.1117/12.851365

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KEYWORDS

Motion estimation

Video coding

Rutherfordium

Surface plasmons

Antimony

Video

Computer programming

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