RTP Payload Format for ITU-T Rec. H.263 Video

Ott, Joerg; Wenger, Stephan; Sullivan, Gary J.; Even, Roni

doi:10.17487/rfc4629

Cited by 17 publications

(13 citation statements)

References 5 publications

(6 reference statements)

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“…The basic operation at the innermost loop consists of an accumulation of pixel differences (i.e., the SAD computation), while the basic operation two levels higher in the loop hierarchy consists of the calculation of the new minimum. In our experiments, we use the parameters of the QCIF (Quarter Common Intermediate Format) format (W = 176, H = 144, m = 16, n = 8) on the multi-core system and the Full HD format (W = 1920, H = 1080, m = 16, n = 8) on the many-core platform [29]. In the remainder of this paper, we simply refer to this as the ME application.…”

Section: Sequential Motion Estimation Algorithmmentioning

confidence: 99%

Energy Efficiency Effects of Vectorization in Data Reuse Transformations for Many-Core Processors—A Case Study †

Hasib

Natvig

Kjeldsberg

et al. 2017

JLPEA

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Abstract:Thread-level and data-level parallel architectures have become the design of choice in many of today's energy-efficient computing systems. However, these architectures put substantially higher requirements on the memory subsystem than scalar architectures, making memory latency and bandwidth critical in their overall efficiency. Data reuse exploration aims at reducing the pressure on the memory subsystem by exploiting the temporal locality in data accesses. In this paper, we investigate the effects on performance and energy from a data reuse methodology combined with parallelization and vectorization in multi-and many-core processors. As a test case, a full-search motion estimation kernel is evaluated on Intel R Core TM i7-4700K (Haswell) and i7-2600K (Sandy Bridge) multi-core processors, as well as on an Intel R Xeon Phi TM many-core processor (Knights Landing) with Streaming Single Instruction Multiple Data (SIMD) Extensions (SSE) and Advanced Vector Extensions (AVX) instruction sets. Results using a single-threaded execution on the Haswell and Sandy Bridge systems show that performance and EDP (Energy Delay Product) can be improved through data reuse transformations on the scalar code by a factor of ≈3× and ≈6×, respectively. Compared to scalar code without data reuse optimization, the SSE/AVX2 version achieves ≈10×/17× better performance and ≈92×/307× better EDP, respectively. These results can be improved by 10% to 15% using data reuse techniques. Finally, the most optimized version using data reuse and AVX512 achieves a speedup of ≈35× and an EDP improvement of ≈1192× on the Xeon Phi system. While single-threaded execution serves as a common reference point for all architectures to analyze the effects of data reuse on both scalar and vector codes, scalability with thread count is also discussed in the paper.

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Section: Sequential Motion Estimation Algorithmmentioning

confidence: 99%

Energy Efficiency Effects of Vectorization in Data Reuse Transformations for Many-Core Processors—A Case Study †

Hasib

Natvig

Kjeldsberg

et al. 2017

JLPEA

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show abstract

“…The construction of multimedia data is done in two classes, one for video and one for audio data using the same object "MediaRecorder" which is belongs to the super class "Video_Audio_Data". After the multimedia data establishment, we transferred these to the "RTP_RTCP_Paquet" class that can fill data camera and microphone in a RTP packet from the length of the header of the packet to the value MTU in the format of the header of RTP packet payload to use for AMRNB (audio) and H263 (video) using the class "Data_AMRNB" and class "Data_H263" in order to create an RTP packet that will be sent in unicast or multicast and an RTCP packet that will be sent every three seconds [5], [6]. Before starting the dissemination of multimedia data in real time, RTSP streams are exchanged between client-server and server-client to provide customers a URL can read the media on the server.…”

Section: B Application With Using Servermentioning

confidence: 99%

Video conference Android platform by your mobile phone

Khalifa¹,

Hamrouni²,

Abdellaoui³

2015

ijacsa

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“…Individual RFC documents have been written to specify how particular types of data are to be transmitted. These special types include, but are not limited to, H.263 video (specified in RFC 4629 [5]), H.264 video (specified in RFC 6184 [6]), AMR audio (specified in RFC 3267 [7]), and AAC audio (specified in RFC 3640 [8]). …”

Section: Real-time Transport Protocol (Rtp) and Rtp Control Protocol mentioning

confidence: 99%

Android Video Streaming

Fletcher¹,

Doria²,

Druno³

2014

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RTP Payload Format for ITU-T Rec. H.263 Video

Cited by 17 publications

References 5 publications

Energy Efficiency Effects of Vectorization in Data Reuse Transformations for Many-Core Processors—A Case Study †

Energy Efficiency Effects of Vectorization in Data Reuse Transformations for Many-Core Processors—A Case Study †

Video conference Android platform by your mobile phone

Android Video Streaming

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