Real-time transcoding of MPEG-2 video bit streams

Tudor, Phil; Werner, Olof

doi:10.1049/cp:19971286

Cited by 33 publications

(14 citation statements)

References 3 publications

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“…The value given in table 2 for dec rec limited set is just an indication as the cascaded decode and recode is done with the reference software and not with our transcoder, thus making it hard to compare running time measurements. 5. CONCLUSION H.264 provides an efficient compression standard for video coding, but when requantizing H.264 bitstream its efficiency can be seriously limited if using non optimal macroblock mode and motion vectors.…”

Section: Resultsmentioning

confidence: 99%

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Mode Refinement Algorithm for H.264 Inter Frame Requantization

Lefol

Bull

2006

2006 International Conference on Image Processing

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The latest video coding standard H.264 has been recently approved and has already been adopted for numerous applications including HD-DVD and satellite broadcast. To allow interconnectivity between different applications using H.264, transcoding will be a key factor. When requantizing a bitstream the incoming coding decisions are usually kept unchanged to reduce the complexity, but it can have a major impact on the coding efficiency. This paper proposes a novel algorithm for mode refinement of inter prediction in the case of requantization of H.264 bitstreams. The proposed approach gives a comparable quality to a full search for a fraction of its complexity by exploiting the statistical properties of the mode distribution and motion vector refinement.

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Section: Resultsmentioning

confidence: 99%

“…Some of these algorithms, such as the Cascaded Pixel Domain Transcoder (CPDT) [2] and the Fast Pixel Domain Transcoder (FPDT) [3], [4], have been used successfully in many practical applications [5], [6]. It is possible to adapt these algorithms with some changes to the new H.264 standard.…”

Section: Introductionmentioning

confidence: 99%

Mode Refinement Algorithm for H.264 Inter Frame Requantization

Lefol

Bull

2006

2006 International Conference on Image Processing

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“…One can compute the complexity measures of pictures from an input bitstream, and then use them for bit-allocation in recoding these pictures. The rate control algorithm used in [39] belongs to this category. However, the complexity measures defined in TM5 are dependent on the coding bit-rate.…”

Section: A Rate Control In Transcodingmentioning

confidence: 99%

Video transcoding: an overview of various techniques and research issues

Ahmad

Wei

Sun

et al. 2005

IEEE Trans. Multimedia

282

154

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Abstract-One of the fundamental challenges in deploying multimedia systems, such as telemedicine, education, space endeavors, marketing, crisis management, transportation, and military, is to deliver smooth and uninterruptible flow of audio-visual information, anytime and anywhere. A multimedia system may consist of various devices (PCs, laptops, PDAs, smart phones, etc.) interconnected via heterogeneous wireline and wireless networks. In such systems, multimedia content originally authored and compressed with a certain format may need bit rate adjustment and format conversion in order to allow access by receiving devices with diverse capabilities (display, memory, processing, decoder). Thus, a transcoding mechanism is required to make the content adaptive to the capabilities of diverse networks and client devices. A video transcoder can perform several additional functions. For example, if the bandwidth required for a particular video is fluctuating due to congestion or other causes, a transcoder can provide fine and dynamic adjustments in the bit rate of the video bitstream in the compressed domain without imposing additional functional requirements in the decoder. In addition, a video transcoder can change the coding parameters of the compressed video, adjust spatial and temporal resolution, and modify the video content and/or the coding standard used. This paper provides an overview of several video transcoding techniques and some of the related research issues. We introduce some of the basic concepts of video transcoding, and then review and contrast various approaches while highlighting critical research issues. We propose solutions to some of these research issues, and identify possible research directions.Index Terms-Frequency domain, heterogeneous video systems, H.26X, MPEG-X, motion vector refinement, spatial domain, video transcoding.

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“…[21,22] and especially [23], where secure scalable streaming enabling transcoding without decryption is being investigated.…”

Section: Video Transcodingmentioning

confidence: 99%