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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zhou, Huan Shu, Haiyan Yu, Rongshan Huang, Haibin Rahardja, Susanto Inst InfoComm Res Signal Proc Dept Singapore Singapore

ISBN: (纸本)9781479903566

A new scalable audio coding scheme is introduced in this paper. Its core idea is to create one additional scalability dimension during the encoding process for the purpose of generating a plural of scalable sub-bitstreams. Based on the multiple sub-streams, a smart truncator is designed that can truncate these sub-bitstreams with optimal rate-distortion (R-D) trade-off. Benefited from the flexible R-D trade-off, the proposed new scheme could, with in a wide bit rate range, out perform those traditional scalable coding schemes, which usually provides a fixed R-D relationship designed at a specified bit rate. To verify the performance, the proposed scheme is further implemented based on a priorart scalable audio codec. Significant quality improvement is observed from the new codec via a series of subjective listening tests.

关键词： scalable coding transcoding truncator coding priority

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Web-based media asset management system design

Web-based media asset management system design

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3rd International Conference on Advanced Design and Manufacturing Engineering (ADME 2013)

作者： Deng Lei-lei Jilin Agr Univ Coll Informat Technol Changchun Peoples R China

ISBN: (纸本)9783037858431

With the social development, networking of information products is enhanced. Media asset management system as a resource management platform must evolve in order to better serve users. Combined with today's more widely used solutions to the industry popular media asset management system design for partial revision proposed optimized media asset management system design ideas.

关键词： media assets FFmpeg transcoding digital storage

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Named Functions for Media Delivery Orchestration

Named Functions for Media Delivery Orchestration

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20th International Packet Video Workshop (PV)

作者： Tschudin, Christian Sifalakis, Manolis Univ Basel Dept Math & Comp Sci CH-4003 Basel Switzerland

ISBN: (纸本)9781479921720

Content delivery networks (CDN) so far have served media distribution by effectively outsourcing it to a network of replica servers: Content requests are satisfied by redirection to some rewritten server addresses. While at present CDNs are leveraged in edge-sitting application server, Content Centric Networking (CCN) is a generalized manifestation of CDNs inside the communications infrastructure: It only supports server-free content names such that forwarding nodes overhearing any type of content delivery can remember it, and subsequent requests by the same name can be served locally, instead of at the original source. In this paper we introduce a framework for orchestrating media distribution tasks in the spirit of CCN by means of named functions. Being able to request a computation by name, like e. g. a video transcoding, content providers as well as content consumers influence the way content is selected, transformed and transferred. The aim of named function networking (NFN) is to serve as a redirection mechanism that allows the network to allocate memory and computation resources in the most optimal way (as CDNs do for content replicas). Particularly compelling is that NFN can serve as a full-fledged media delivery orchestration infrastructure from within the network. We demonstrate its power with scenarios ranging from simple uses for in-network stream buffering and transcoding, to more complex tasks as content-revocation, (video) session authentication and content store management.

关键词： multimedia communication transcoding video coding

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Video Quality in Multiple HEVC Encoding-Decoding Cycles

Video Quality in Multiple HEVC Encoding-Decoding Cycles

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20th International Conference on Systems, Signals and Image Processing (IWSSIP)

作者： Stankowski, Jakub Grajek, Tomasz Wegner, Krzysztof Domanski, Marek Poznan Univ Tech Chair Multimedia Telecommun & Microelect Ul Polanka 3 PL-60965 Poznan Poland

ISBN: (纸本)9781479909414;9781479909421

Paper concerns accumulation of video-quality losses in multiple HEVC encoding and decoding cycles. The results of extensive experiments with standard video test sequences are reported. General conclusions has been drawn about relative quality losses after each cycle, as well as about total quality loss with respect to first cycle. In general, quality losses after each cycle are decreasing and total quality loss is saturating after several cycles. Total quality losses after several cycles are hardly dependent on sequence content.

关键词： video compression video coding multiple cycles transcoding HEVC H.265 MPEG MPEG-H

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Efficient Low Complexity SVC Video Transrater with Spatial Scalability

Efficient Low Complexity SVC Video Transrater with Spatial S...

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15th International Conference on Advanced Concepts for Intelligent Vision Systems (ACIVS)

作者： Deknudt, Christophe Coudoux, Francois-Xavier Corlay, Patrick Gazalet, Marc Gharbi, Mohamed Univ Valenciennes UMR 8520 OAE Dept IEMN F-59313 Valenciennes 9 France

ISBN: (纸本)9783319028958;9783319028941

In this paper we propose a new H.264 SVC transrating architecture for spatially scalable SVC compressed video streams. The algorithm is low complexity based, it applies to spatially scalable pre-encoded video streams and allows fine bit rate granularity while keeping highest spatial resolution. Simulation results demonstrate that transcoded bit streams produce satisfying picture quality even at bit rate reduction up to 66%. The comparison with MGS compressed video streams shows that the proposed transrating aslgorithm offers satisfying performances compared to MGS when bit rate reduction remains limited. Moreover quality scalability is obtained thanks to our algorithm even if the SVC compressed video bitstream has not been processed using MGS scalability right from the start(1).

关键词： Video compression H.264 SVC Spatial Scalability transcoding Medium Grain Scalability (MGS)

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A Mode-Mapping and Optimized MV Conjunction based MGS-scalable SVC to AVC IPPP Transcoder

A Mode-Mapping and Optimized MV Conjunction based MGS-scalab...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Sun, Lei Liu, Zhenyu Ikenaga, Takeshi Waseda Univ Grad Sch Informat Prod & Syst\ Tokyo Japan Tsinghua Univ Natl Lab Informat Sci & Technol Beijing Peoples R China

ISBN: (纸本)9781467357623;9781467357609

Scalable Video Coding (SVC) is an extension of H. 264/AVC, aiming to provide the ability to adapt to heterogeneous environments. It offers great flexibility for bitstream adaptation in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC is necessary due to the existence of legacy AVC-based systems. This paper proposes a 3-stage fast SVC-to-AVC transcoder for medium-grain quality scalability (MGS). Hierarchical-P structured SVC bitstream is transcoded into IPPP structured AVC bitstream with multiple reference frames. In the first stage, mode decision is accelerated by proposed SVC-to-AVC mode mapping scheme. In the second stage, INTER motion estimation is accelerated by an optimized motion vector (MV) conjunction method to predict the MV with a reduced search range. In the last stage, Hadamard-based all zero block (AZB) detection is utilized for early termination. Simulation results show that proposed transcoder achieves very similar coding efficiency as the optimal result, but with averagely 92.3% computational time saving.

关键词： Hadamard codes motion estimation transcoding video coding

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On the Interaction of Adaptive Video Streaming with Content-Centric Networking

On the Interaction of Adaptive Video Streaming with Content-...

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20th International Packet Video Workshop (PV)

作者： Grandl, Reinhard Su, Kai Westphal, Cedric Alpen Adria Univ Klagenfurt Inst Networked & Embedded Syst Klagenfurt Austria Rutgers State Univ WINLAB Brunswick NJ 08855 USA Univ Calif Santa Cruz CA & Comp Engn Dept Santa Cruz CA 95064 USA Huawei Innovat Ctr Santa Clara CA USA

ISBN: (纸本)9781479921720

Two main trends in today's Internet are of major interest for video streaming services: 1) most content delivery platforms are converging towards using adaptive video streaming over HTTP;and 2) new network architectures will allow caching at intermediate points within the network. We investigate one of the most popular streaming service in terms of rate adaptation and opportunistic caching. Our experimental study shows that the streaming client's rate selection trajectory, i.e., the set of selected segments of varied bit rates which constitute a complete video, is not repetitive across separate downloads. Also, the involvement of caching could lead to frequent alternation between cache and server when serving back client's requests for video segments. These observations warrant cautions for rate adaption algorithm design and trigger our analysis to characterize the performance of in-network caching for HTTP streaming. Our analytic results show: (i) a significant degradation of cache hit rate for adaptive streaming, with a typical file popularity distribution in nowadays internet;(ii) as a result of the (usually) higher throughput at the client-cache connection compared to client-server one, cache-server oscillations due to misjudgments of the rate adaptation algorithm occur. Finally, we introduce DASH-INC, a framework for improved video streaming in caching networks including transcoding and multiple throughput estimation.

关键词： Internet cache storage telecommunication traffic transcoding transport protocols video coding video streaming

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It's a retrieval problem, not a storage problem

It's a retrieval problem, not a storage problem

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SMPTE Annual Technical Conference and Exhibition 2013, SMPTE 2013

作者： Marc, Josef Tsang, Chi-Long Steinberg, Victor Levkov, Maxim Archimedia Technology Inc. Delray Beach FL United States Archimedia Technology Inc. SAMMA Systems Ltd Hong Kong Hong Kong VideoQ Inc. Santa Clara CA United States Artek Media International Inc. Los Angeles CA United States

ISBN: (纸本)9781629938370

MXF standards SMPTE ST 377-1:2011 and ST 422:2006;SMPTE Technical Committee TC-31FS AHG ST 422 Revision (JPEG2000 in MXF);the Advanced Media Workflow Association;and related SMPTE standards all clarify MXF implementations for the most active use cases. To illustrate technical advances, this paper presents laboratory observations of MXF video clips from multivendor sources alongside mathematically generated test patterns, master- and archival-grade video content, and an MXF metadata viewer. The paper focuses especially on reformatting JPEG2000, uncompressed, AVI, and MOV master/archive files into MXF for interchange and preservation. Video clips are shown.

关键词： Archives Interchange JPEG2000 Master files MXF Preservation Reformatting transcoding

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On modeling and evaluating multicomputer transcoding architectures for live-video streams

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MULTIMEDIA TOOLS AND APPLICATIONS 2009年第2期43卷 109-129页

作者： de Mello, Rodrigo Fernandes Goularte, Rudinei Dodonov, Evgueni Yang, Laurence T. Park, Jong Hyuk Kim, Tai-hoon Univ Sao Paulo Dept Comp Sci Inst Math & Comp Sci Sao Paulo Brazil St Francis Xavier Univ Dept Comp Sci Antigonish NS B2G 1C0 Canada Kyungnam Univ Masan South Korea Hannam Univ Taejon South Korea

The pervasive and ubiquitous computing has motivated researches on multimedia adaptation which aims at matching the video quality to the user needs and device restrictions. This technique has a high computational cost which needs to be studied and estimated when designing architectures and applications. This paper presents an analytical model to quantify these video transcoding costs in a hardware independent way. The model was used to analyze the impact of transcoding delays in end-to-end live-video transmissions over LANs, MANs and WANs. Experiments confirm that the proposed model helps to define the best transcoding architecture for different scenarios.

关键词： Live video transcoding Multimedia

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transcoding of H.264 bitstream to AVS bitstream

Transcoding of H.264 bitstream to AVS bitstream

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5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Wang, Baoguo Shi, Yunhui Yin, Baocai Beijing Univ Technol Beijing Key Lab Multimedia & Intelligent Software Beijing 100124 Peoples R China

ISBN: (纸本)9781424436927

This paper proposes a transcoding scheme from H.264 to AVS. As the highest performance video coding standard, H.264 is developed by MPEG and ITU, AVS is developed by the Audio Video Coding Standard Working Group of China. The two standards will co-exist in the future application, therefore, it is worthy to transcode the video format from the H.264 to AVS and almost no complete research on this scheme until now. This paper proposes an effective transcoding method to achieve high efficient and fast transcoding without losing much quality by reusing intra mode, inter mode, motion vector and SAD, etc. Detailed experiment results demonstrate that the proposed algorithm can effectively reduce the transcoding complexity.

关键词： H.264 AVS transcoding Motion vector reuse Mode reuse SAD reuse

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