MPEG-2 multi-program transport stream transcoder

Takahashi, Takeshi; Kasai, Hiroyuki; Hanamura, Tsuyoshi; Sugiura, Maki; Tominaga, Hiroyuki

doi:10.1109/icme.2001.1237747

Cited by 3 publications

(2 citation statements)

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“…-Capacidade de atuar no fluxo de transporte, ressincronizando tanto para o caso de amostras do PCR atrasadas quanto de amostras adiantadas; -Correção do sincronismo sem a utilização de métodos complexos como o recálculo de todas as amostras de PCR [13,14] ou a compensação das variações de atraso [15,16], que necessitam de implementações em hardware; -Implementação feita totalmente em software, apresentando assim custos menores, se comparados a uma implementação em hardware;…”

Section: Conclusõesunclassified

An Environment for Test and Evaluation of Synchronism for Digital Video Transmission

Hirayama

Silveira

2006

Proceedings of the 12th Brazilian Symposium on Multimedia and the Web

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Content distribution packet networks can be used in video and audio transport for TV applications. These networks make signal transport more flexible. Nevertheless, they may add delay and jitter, damaging the synchronism of the information streams and, consequently, the media presentation. In this paper, an environment was proposed for synchronism test and evaluation. It was developed to study the influence of disturbances caused by data networks in the synchronism of MPEG2 programs. It enables the control of QoS parameters of the distribution network used to transmit packets from a MPEG2 transport stream and allows the evaluation of the influence of these parameters in the synchronism of the streams. Furthermore, transport stream resynchronization mechanisms were implemented, minimizing the effects of these disturbances in the network. It was observed that the methods implemented reduce the effects of jitter in the network and resynchronize the transport stream transmitted, in a way that the jitter in the time reference samples (Program Clock Reference -PCR) of the stream returns to previous levels (without applying jitter in the network).

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Section: Conclusõesunclassified

An Environment for Test and Evaluation of Synchronism for Digital Video Transmission

Hirayama

Silveira

2006

Proceedings of the 12th Brazilian Symposium on Multimedia and the Web

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“…Those works face three main problems: data insertion, PID (Packet Identifier) mapping and PCR (Program Clock References) correction [3]- [6]. The main goal of these works is to multiplex a number of inputs so that they fit in a given output bitrate, possibly transcoding the input streams to adapt their bitrates [7]. Another common feature is that they receive the input data in real time in TS form or directly from the MPEG encoder [8], so they can implement a scheduling algorithm [9] to multiplex the packets they have in their input buffers.…”

Section: Introductionmentioning

confidence: 99%

A versatile multiplexing algorithm exclusively based on the MPEG-2 systems layer

Rivas¹,

Gulías

Abalde

2005 1st International Conference on Multimedia Services Access Networks, 2005. MSAN '05.

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This work introduces an algorithm to multiplex stored MPEG-2 PES streams into one SPTS regardless of the PES streams type or bitrate. The algorithm is devised to comply with the MPEG2 standard STD. In order to support all available levels and profiles, the STD buffer lengths are parametrized and a maximum output bitrate can be established. To check the validity of the algorithm, a simulator has been implemented in a high level functional language. To prove its usefulness, a MPEG-2 PS to TS converter was implemented in C using this algorithm. The paper focuses on the algorithm description and shows some results obtained with the simulator.

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