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Multi-rate HEVC encoder based on x265 2.0 that implements a CU structure reuse from a high-quality reference to lower-quality dependent encodings, as described in: D. Schroeder, P. Rehm, and E. Steinbach, "Block structure reuse for multi-rate High Efficiency Video Coding", Proc. IEEE ICIP 2015, Sep. 2015, Québec, Canada.

License: GNU General Public License v2.0

CMake 0.60% Shell 0.03% Batchfile 0.13% C++ 31.22% Assembly 65.23% C 2.79%

multi-rate-x265's Introduction

This multi-rate encoder based on x265 version 2.0 reduces the encoding time for multiple representations by 10 to 20% compared to the original x265 encoder. A few example results can be found on https://damienschroeder.wordpress.com/2016/08/10/multi-rate-hevc-with-x265-for-adaptive-http-streaming/

The implemented method was proposed in the paper: D. Schroeder, P. Rehm, and E. Steinbach, "Block structure reuse for multi-rate High Efficiency Video Coding", Proc. IEEE International Conference on Image Processing (ICIP), Sep. 2015, Quebec, Canada. A free copy of this paper can be found at: http://www.lmt.ei.tum.de/forschung/publikationen/dateien/Schroeder2015Blockstructurereusefor.pdf

HOW TO

A new CLI option is available: --mr-mode

DEFAULT By default, the multi-rate encoding mode is off.

WRITE MODE (--mr-mode 1): When mr-mode is 1, a file called analysisData.bin containing the CU structure of the present (reference) encoding is created.

LOAD MODE (--mr-mode 2): When mr-mode is 2, the (previously created) analysisData.bin file is read and the present (dependent) encoding is shortened according to the method proposed in the paper.

example:

./x265 video.yuv -o bitstream.bin --qp 22 --mr-mode 1

./x265 video.yuv -o bitstream.bin --qp 27 --mr-mode 2

./x265 video.yuv -o bitstream.bin --qp 32 --mr-mode 2

./x265 video.yuv -o bitstream.bin --qp 37 --mr-mode 2