• Journal of Broadcast Engineering
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• v.25 no.2
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• pp.252-264
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• 2020

Korea has launched the world-wide first terrestrial UHD broadcast services on May 31, 2017. While the existing HDTV broadcast services use MPEG-2 TS (Tranport Stream) standard for multiplexing and delivering compressed media with additional data, the terrestrial UHD broadcast services use MMT (MPEG Media Transport) standard, which is the next-generation standard beyond MPEG-2 TS. However, the production cost of UHD contents is so high that only a part of the total broadcast time is filled with UHD contents and the UHD time portion is planned to be gradually increased. On the other hand, the ATSC 3.0 standard that uses MMT is not yet used in full-fledged broadcast services in North America. Hence MMT broadcast equipment is still at an early stage with high prices. In this paper we implemented a multi-thread software running on an ordinary PC that can be utilized to realize a low-cost converter that converts the output of an existing MPEG-2 TS multiplexer to an MMTP (MMT Protocol) packet stream. We also verified the functionality of the software through experiments.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.11a
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• pp.287-290
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• 2002

디지털 방송 서비스가 보편화되면서 MPEG-2, DVB 및 ATSC Transport Stream의 사용이 확산되고 있다. 수신된 방송 Transport Stream(TS)은 TS 그대로 이용하거나 Program Stream(PS)로 변환한 후 저장하여 이용한다. DVD같은 디지털 저장매체에는 PS가 사용되므로 디지털 방송을 수신하여 이를 DVD나 DVD-RAM과 같은 저장 매체에 저장하려면 TS를 저장용 Stream인 PS로 변환하여 저장하여야 DVD Player와 같은 매체 재생기에서 이를 이용할 수 있다. 본 논문에서는 TS를 PS로 변환하고 변환된 TS와 PS를 분석하여 얻어진 변환 및 변환 후의 여러 결과들을 비교 분석하여 보여준다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.476-479
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• 2015

현 3D 실험방송은 좌 영상과 우 영상의 듀얼 스트림을 전송하는 서비스 호환 3D서비스를 제공하고 있다. 이와 같은 방식은 지상파를 이용해 전송되므로 제한된 대역폭에 따른 화질의 저하가 불가피한 것으로 여겨진다. 이에 본 논문에서는 상기 두 영상을 각각 기존의 지상파와 IP망으로 전송하여 화질의 열화 없이 안정적인 화질을 제공할 수 있는 MMT와 MPEG2-TS 융합형 Hybrid 3D 방송 시스템을 제안하였다. 제안한 시스템은 기존의 지상파를 통해 주영상을 MMT의 GFD mode를 이용하여 보조영상을 전송하여 두 영상의 동기화를 통해 고화질 스테레오스코픽 영상을 구성한다. 이를 위해 본 논문에서는 MPEG2-TS와 MMT의 GFD mode의 파일 구성을 각각 분석하고, 실험결과를 통해 제안한 MMT와 MPEG2-TS 융합형 Hybrid 3D 방송 시스템을 검증하였다.

• The Journal of the Korea Contents Association
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• v.10 no.8
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• pp.59-65
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• 2010

This paper proposes an implementation of a hardware module for transmitting MPEG-2 TS data over the internet protocol (IP)-based network. This implementation consists of two modules; one is an encapsulation module which bridges between n TS packets, where $1\;{\leq}\;n\;{\leq}\;7$, and an IP packets, the other is a packet conversion module which extracts an DSM-CC PS packet from consecutive TS packets and then reconstructing an IP packet. So, these IP packets are carried over 150 megabits per second. Although overall work flow of the proposed DeMUX is based on the reference design of ALTERA, the DeMUX is enhanced by modifying it and performs more functions by adding a packet conversion module. The DeMUX is described by Verilog-HDL (hardware description language) and shows the faithful functionality and throughput through the simulation.

• Journal of Broadcast Engineering
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• v.22 no.6
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• pp.744-754
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• 2017

This paper compares transport overhead of MPEG-2 TS, MMT and ROUTE in order to compare transport efficiency between the DTV and UHDTV. The MPEG-2 TS standard, widely used, was established for multiplexing and synchronizing encoded audio and video, additional information. In recent years, MMT and ROUTE was established as a next generation multimedia transport standard for the new broadcasting communication environment. In this paper, we compare and analyze transport overhead about three protocol. In order to analysis, we captured the UHD A/V stream in real-time broadcasting service using ROUTE and MMT, and we calculated and analyzed transport overhead using the overhead analysis program which was developed in our laboratory. Furthermore, for comparison under the same conditions, we assumed the MPEG-2 TS stream by extracting ES of UHD A/V stream based on the DTV standard. In this paper, we show the results of protocol transport efficiency in case of basic A/V stream except for additional services. And result show that MMT and ROUTE have similar overhead and MPEG-2 TS is relatively small overhead. However, since MPEG-2 TS result does not consider null packets, it is expected that the relative overhead difference will be reduced.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.31-33
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• 2012

MPEG 3DV 그룹에서는 재생되는 시점 수 보다 적은 시점의 다시점 비디오와 그에 대응하는 깊이영상 및 관련 파라미터를 하나의 비트스트림으로 부호화하는 다시점 및 깊이영상 부호화(MVD: Multiview Video plus Depth) 표준화가 진행 중에 있다. 본 논문은 3DV MVD 비트스트림 포맷을 MPEG-2 TS 로 다중화하기 위한 TS 다중화 확장기법을 제안한다. 또한, MVD 재현 시나리오에 따른 효율적인 TS 전송 구조를 제시하고, TS 다중화 SW 툴의 설계 및 구현을 통하여 그 장단점을 고찰한다. 제안된 기법은 프로그램 및 ES 에 대한 정보를 함께 다중화하여 MVD 의 다양한 재현 시나리오 적응 및 효율적인 복호화 및 가상시점 합성을 지원할 수 있다.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.5
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• pp.551-562
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• 2002

Digital TV software, receiver system for digital broadcasting, processes huge MPEG-2 TS formatted data that has variable hierarchy. Because of complexity and enormity of MPEG-2 TS, it is difficult for user to generate test data manually. Generating of test data is not only expensive and time consuming but also requires expert knowledge of MPEG-2 standard. In this paper, we implemented the tool that generates the MPEG-2 TS formatted test data for Digital TV software. Using this tool, user ran get reliable test data without extensive knowledge of MPEG-2 standard. Also, database mechanism that our tool based on supports variable hierarchy of MPEG-2 TS.

• Journal of Broadcast Engineering
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• v.16 no.5
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• pp.722-737
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• 2011

In this paper, we propose an estimation of network jitter that occurs when transmitting TCP packets containing MPEG-2 TS in progressive streaming service over wired or wireless Internet networks. Based on the estimated network jitter size, we can calculate required de-jitter buffering time to absorb the network jitter at the receiver side. For this purpose, by exploiting the PCR timestamp existing in the TS packet header, we create a new timestamp information that is marked in the optional field of TCP packet header to estimate the network jitter. By using the proposed de-jitter buffering scheme, it is possible to employ the conventional T-STD buffer model without any modification in the progressive streaming service over IP networks. The proposed method can be applicable to the recently developed international standard, MPEG DASH (dynamic adaptive streaming over HTTP) technology.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.111-113
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• 2010

본 논문에서는 SVC(Scalable Video Coding) 및 MVC(Multiview Video Coding) 등의 다계층 비디오의 효율적인 적응 HTTP 스트리밍을 위한 MPEG-2 TS(Transport Stream) 헤더의 확장을 제안한다. 먼저 TS로 다중화한 SVC/MVC를 HTTP를 통하여 스트리밍 할 경우 계층별 적응 스트리밍을 지원하기 위한 기존 TS의 한계점을 분석하고, TS 헤더의 확장을 통하여 TS 레벨에서 효율적인 적응을 제공하는 시그널링 기법을 제시한다. 본 논문의 제안 기법은 TS 헤더의 private_data를 추가적으로 정의하여 스케일러빌리티 및 뷰 정보를 기술함으로써 TS 단위로 스케일러블 계층 및 뷰 간 적응 스트리밍을 제공한다.

• Journal of Broadcast Engineering
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• v.6 no.1
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• pp.82-97
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• 2001

In this paper, we describe a software implementation of a digital TV stream analyzer that can be used for analyzing and verifying digital TV bitstreams on personal computes. It accepts as input MPEG-2 transport streams (TS's) already stored on hard disks and doesn't require any special hardware. After classifying TS packets into program specific information(PSI) TS section auido, video, program clock reference (PCR) private data and null packets, it displays their contents through a graphic user interface along with the syntax elements of the TS header. Also it displays the decoded I frame nearest in time axis the TS packet currently shown This feature helps pin pointing the specific location of problematic parts in bitstreams. The bitsteam analyzer provides the compliance test of MPEG-2 Systems standard and the data injection functionality with which one can easily insert additional data to existing MPEG-2 bitstreams. Using the resulting system one can produce at low test streams for interactive broadcasting and data broadcasting for laboratory use.