Adjusting video tiling to available resources in a per-frame basis in High Efficiency Video Coding

The HEVC standard brings large gains in coding efficiency, significant increase in computational effort and a new parallel encoding structure called tiles. Tiles can be used to greatly decrease encoding time through parallel processing at the cost of coding efficiency degradation. In multi-core systems running multiple tasks, the resources available to the HEVC application may not remain constant along the encoding process. Using fixed amount of tiles in such scenario may lead to either sub-optimal speedup or unnecessary coding efficiency losses. In this paper, we analyze the speedup versus coding efficiency compromise and propose a method to tune the tiling used, during runtime, according to the available resources. Our method increase coding efficiency compared to fixed tiling without significant decrease in speedup.