A Direct Inter-Mode Selection Algorithm for P-Frames in Fast H.264/AVC Transcoding

Bin SONG; Haixiao LIU; Hao QIN; Jie QIN

doi:10.1587/transcom.E95.B.2101

A Direct Inter-Mode Selection Algorithm for P-Frames in Fast H.264/AVC Transcoding

Bin SONG, Haixiao LIU, Hao QIN, Jie QIN

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A direct inter-mode selection algorithm for P-frames in fast homogeneous H.264/AVC bit-rate reduction transcoding is proposed in this paper. To achieve the direct inter-mode selection, we firstly develop a low-complexity distortion estimation method for fast transcoding, in which the distortion is directly calculated from the decoded residual together with the reference frames. We also present a linear estimation method to approximate the coding rate. With the estimated distortion and rate, the rate-distortion cost can be easily computed in the transcoder. In our algorithm, a method based on the normalized rate difference of P-frames (RP) is used to detect the high motion scene. To achieve fast transcoding, only for the P-frames with RP larger than a threshold, the rate-distortion optimized (RDO) mode decision is performed; meanwhile, the average cost of each inter-mode (ACM) is calculated. Then for the subsequent frames transcoding, the optimal coding mode can be directly selected using the estimated cost and the ACM threshold. Experiments show that the proposed method can significantly simplify the complex RDO mode decision, and achieve transcoding time reductions of up to 62% with small loss of rate-distortion performance.

Publication: IEICE TRANSACTIONS on Communications Vol.E95-B No.6 pp.2101-2108

Publication Date: 2012/06/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E95.B.2101

Type of Manuscript: PAPER

Category: Multimedia Systems for Communications

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Bin SONG, Haixiao LIU, Hao QIN, Jie QIN, "A Direct Inter-Mode Selection Algorithm for P-Frames in Fast H.264/AVC Transcoding" in IEICE TRANSACTIONS on Communications, vol. E95-B, no. 6, pp. 2101-2108, June 2012, doi: 10.1587/transcom.E95.B.2101.
Abstract: A direct inter-mode selection algorithm for P-frames in fast homogeneous H.264/AVC bit-rate reduction transcoding is proposed in this paper. To achieve the direct inter-mode selection, we firstly develop a low-complexity distortion estimation method for fast transcoding, in which the distortion is directly calculated from the decoded residual together with the reference frames. We also present a linear estimation method to approximate the coding rate. With the estimated distortion and rate, the rate-distortion cost can be easily computed in the transcoder. In our algorithm, a method based on the normalized rate difference of P-frames (RP) is used to detect the high motion scene. To achieve fast transcoding, only for the P-frames with RP larger than a threshold, the rate-distortion optimized (RDO) mode decision is performed; meanwhile, the average cost of each inter-mode (ACM) is calculated. Then for the subsequent frames transcoding, the optimal coding mode can be directly selected using the estimated cost and the ACM threshold. Experiments show that the proposed method can significantly simplify the complex RDO mode decision, and achieve transcoding time reductions of up to 62% with small loss of rate-distortion performance.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E95.B.2101/_p

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@ARTICLE{e95-b_6_2101,
author={Bin SONG, Haixiao LIU, Hao QIN, Jie QIN, },
journal={IEICE TRANSACTIONS on Communications},
title={A Direct Inter-Mode Selection Algorithm for P-Frames in Fast H.264/AVC Transcoding},
year={2012},
volume={E95-B},
number={6},
pages={2101-2108},
abstract={A direct inter-mode selection algorithm for P-frames in fast homogeneous H.264/AVC bit-rate reduction transcoding is proposed in this paper. To achieve the direct inter-mode selection, we firstly develop a low-complexity distortion estimation method for fast transcoding, in which the distortion is directly calculated from the decoded residual together with the reference frames. We also present a linear estimation method to approximate the coding rate. With the estimated distortion and rate, the rate-distortion cost can be easily computed in the transcoder. In our algorithm, a method based on the normalized rate difference of P-frames (RP) is used to detect the high motion scene. To achieve fast transcoding, only for the P-frames with RP larger than a threshold, the rate-distortion optimized (RDO) mode decision is performed; meanwhile, the average cost of each inter-mode (ACM) is calculated. Then for the subsequent frames transcoding, the optimal coding mode can be directly selected using the estimated cost and the ACM threshold. Experiments show that the proposed method can significantly simplify the complex RDO mode decision, and achieve transcoding time reductions of up to 62% with small loss of rate-distortion performance.},
keywords={},
doi={10.1587/transcom.E95.B.2101},
ISSN={1745-1345},
month={June},}

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TY - JOUR
TI - A Direct Inter-Mode Selection Algorithm for P-Frames in Fast H.264/AVC Transcoding
T2 - IEICE TRANSACTIONS on Communications
SP - 2101
EP - 2108
AU - Bin SONG
AU - Haixiao LIU
AU - Hao QIN
AU - Jie QIN
PY - 2012
DO - 10.1587/transcom.E95.B.2101
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E95-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2012
AB - A direct inter-mode selection algorithm for P-frames in fast homogeneous H.264/AVC bit-rate reduction transcoding is proposed in this paper. To achieve the direct inter-mode selection, we firstly develop a low-complexity distortion estimation method for fast transcoding, in which the distortion is directly calculated from the decoded residual together with the reference frames. We also present a linear estimation method to approximate the coding rate. With the estimated distortion and rate, the rate-distortion cost can be easily computed in the transcoder. In our algorithm, a method based on the normalized rate difference of P-frames (RP) is used to detect the high motion scene. To achieve fast transcoding, only for the P-frames with RP larger than a threshold, the rate-distortion optimized (RDO) mode decision is performed; meanwhile, the average cost of each inter-mode (ACM) is calculated. Then for the subsequent frames transcoding, the optimal coding mode can be directly selected using the estimated cost and the ACM threshold. Experiments show that the proposed method can significantly simplify the complex RDO mode decision, and achieve transcoding time reductions of up to 62% with small loss of rate-distortion performance.
ER -