Resumo-Este artigo apresenta uma análise da paralelização na compressão de vídeo de acordo com o padrão HEVC utilizando Tiles. Diferentes configurações de Tiles são avaliadas considerando duas variáveis principais: (1) speedup e (2) eficiência de compressão. Primeiro discutimos como as características do conteúdo podem influenciar na divisão da carga computacional utilizando a configuração de Tiles uniformes. Em seguida, vários vídeos são comprimidos utilizando diferentes configurações de Tiles para analisar o speedup resultante junto com a eficiência de compressão. Como conclusão, mostramos que existe potencial para melhorar em até 18,9% o speedup da compressão de vídeo utilizando o HEVC paralelizado através do uso de diferentes configurações de Tiles causando uma variação desprezível na eficiência de compressão.
The encoding of 360 videos presents many challenges. These spherical videos require a planar projection stage prior to encoding, and there are no studies on how projection interferes with the encoder decisions. Also, due to the increased resolution, encoding 360 videos is computationally costlier than conventional videos. In this work, we perform an extensive evaluation of how the texture distortions caused by the projection interfere with the encoder’s behavior and exploit these interferences to propose multiple fast algorithms to accelerate the encoding. Experimental results show that the proposed algorithms reduce encoding time significantly with minor coding efficiency penalties, while the evaluations expose novel insights into the encoder behavior. The reached results are published in important events and journals.
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