Efficient PU Mode Decision and Motion Estimation for H.264/AVC to HEVC Transcoder

Chen, Zong-Yi; Fang, Jiunn-Tsair; Liao, Tsai-Ling; Chang, Pao-Chi

doi:10.5121/sipij.2014.5208

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…Generally, the proposed approach gets better speed-ups for sequences with complex motion activities, such as RaceHorses and Keiba, and worse speedups for sequences with simple motion activities and high intra modes proportion, like Mobisode2 and Flowervase. Finally, the proposed approach achieves an average speed-up (7.89x) better than related approaches, such as Chen et al [11] (1.79x), Jiang et al [4] (2.00x) and Peixoto et al [5] (3.83x), for instance. …”

Section: Resultsmentioning

confidence: 80%

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Fast H.264 to HEVC transcoder based on post-order traversal of quadtree structure

Franche

Coulombe

2015

2015 IEEE International Conference on Image Processing (ICIP)

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In this paper, we propose a fast mode decision framework and a fast motion estimation algorithm for H.264 to High Efficiency Video Coding (HEVC) transcoding. The fast mode decision framework employs a post-order (bottom-up) traversal of the coding tree unit (CTU) quadtree. Based on this traversal and H.264 information, several strategies are proposed to reduce HEVC modes to be tested and a ratedistortion (RD) cost prediction model is used to terminate the processing of a tested mode early. The proposed fast motion estimation algorithm selects the best candidate from a list of H.264 motion vectors (MVs) and previously encoded HEVC MVs. Compared to a full re-encoding, experimental results show that the proposed solution achieves speed-ups of up to 12.75x, for an average BD-Rate of 3.28%.

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Section: Resultsmentioning

confidence: 80%

“…Several fast mode decision approaches have been proposed in the literature [3][4][5][6][7][8][9][10][11][12]. For example, Fang et al use H.264 modes, encoded residual and variance of motion vectors (MVs) to skip some prediction unit (PU) modes [3].…”

Section: Introductionmentioning

confidence: 99%

Fast H.264 to HEVC transcoder based on post-order traversal of quadtree structure

Franche

Coulombe

2015

2015 IEEE International Conference on Image Processing (ICIP)

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“…Finally, in light of the various steps performed in RFA, we believe that our algorithm could be more easily adapted to hardware implementation, and that, in conclusion, it is suited to cases where RFA would be too slow or introduce too much delay. In Table 13 we compare FA+QTL+MVR to FMD-FME [4] and [5]. For brevity, we report here only the average of the transcoding results, which were obtained on the sequences of classes B, C and D. As for the RFA case, we observe that the proposed method is faster than references even though it provides a larger coding rate.…”

Section: Low Delay Configurationmentioning

confidence: 95%

“…The mode decision algorithm is more complicated and depends on the partition of H.264 macroblocks (see [4] for more details). Finally, in [5] FMD-FME is enhanced by considering PU-level information. The proposed transcoding scheme is still complicated but the transcoding performance in terms of BD-Rate increase and transcoding speedup are very close to [4].…”

Section: Avc To Hevc Transcoders In Literaturementioning

confidence: 99%

“…In the mode mapping category, AVC information is used by the HEVC encoder to decide to either skip some coding modes / partition size tests, or to stop the quadtree splitting operation [4,5,8,18,26]. In the motion vector reuse schemes, the motion estimation process within Inter tests is simplified by skipping some positions to test using decoded AVC motion information [13,17,19,20,27].…”

Section: Introductionmentioning

confidence: 99%

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AVC to HEVC transcoder based on quadtree limitation

Mora

Cagnazzo

Dufaux

2016

Multimed Tools Appl

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Following the finalization of the state-of-the-art High Efficiency Video Coding (HEVC) standard in January 2013, several new services are being deployed in order to take advantage of the superior coding efficiency (estimated at 50 % less bitrate for the same visual quality) that this standard provides over its predecessor: H.264 / Advanced Video Coding (AVC). However, the switch from AVC to HEVC is not trivial as most video content is still encoded in AVC. Consequently, there is a growing need for fast AVC to HEVC transcoders in the market today. While a trivial transcoder can be made by simply cascading an AVC decoder and an HEVC encoder, fast transcoding cannot be achieved. In this paper, we present an AVC to HEVC transcoder where decoded AVC blocks are first fused according to their motion similarity. The resulting fusion map is then used to limit the quadtree of HEVC coded frames. AVC motion vectors are also used to determine a better starting point for integer motion estimation. Experimental results show that significant transcoder execution time savings of 63 % can be obtained with only a 1.4 % bitrate increase compared to the trivial transcoder.

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