An Efficient Encoding Method For Video Compositing In Hevc
MULTIMEDIA MODELING (MMM 2020), PT I(2020)
摘要
Video compositing for compressed HEVC streams is highly demanded in instant communication applications such as video chat. As a flexible scheme, pixel domain compositing involves the processes of completely decoding the streams, inserting the decoded video, and finally re-encoding the new composite video. The time consumption of the whole scheme comes almost entirely from the re-encoding process. In this paper, we propose an efficient encoding method to speedup the re-encoding process and improve encoding efficiency. The proposed method separately designs encoding for blocks inside the frame region covered by inserted video and blocks in non-inserted region, which overcomes numerous difficulties of utilizing information from the decoding process. Experimental results show that the proposed method achieves a PSNR increase of 0.33 dB, or a bit rate saving of 10.11% on average compared with normal encoding using unmodified HM software. Furthermore, the encoding speed is 7.04 times that of normal encoding method, equivalent to an average reduction of 85.8% in computational complexity.
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关键词
Video compositing, High Efficiency Video Coding (HEVC), Encoding optimization, Information reuse
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