On the Efficiency Difference Between Range and Huffman Coding on CELT Layer of Opus Audio Coder
Shingchern D. You, Po-Yueh Lai · 2018
This paper compares the coding efficiency between the range coder in the Opus coder and the Huffman coder used in the MP-3 (MPEG-I Layer 3) and MPEG-2 AAC. The results show that the range coder has efficiency advantage of about 9 % at a rate of 128 kbps. The simulation, in a sense, indicates that transcoding from the Opus format to MP-3 or AAC format will lead to quality degradation.