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Piotr Madej - Engineering Thesis Summary

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Piotr Madej
Piotr Madej

The document summarizes an engineering thesis that designed and implemented a headend and IP infrastructure to transmit television signals over a network. The headend received channels from three free-to-air multiplexes using DVB-T receivers. The signals were retransmitted using multicast protocols over a network built with Allied Telesis switches supporting IGMP. Users could then watch digital TV through a Stalker middleware interface and MAG 250 decoder. The paper also reviewed audio/video compression methods, conditional access systems, available signal sources, and IP transmission protocols.

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48 Summary Transmission of the digital television via IP network is the next step in the development of the broadcasting platforms. This full service digital solution gradually replaces the terrestrial, satellite and cable television. The IPTV service shares many properties with the OTT (Over The Top) service, e.g. YouTube, Netflix however, it does not guarantee the quality of service using the Internet instead of a dedicated network. The aim of this engineering thesis is to design and implement a headend and an IP infrastructure which would allow for a transmission of a television signal. The headend has been receiving television channels from three free-to-air multiplexes broadcast by the digital terrestrial television DVB-T MT4171 Media-Tech receivers. According to the subject¡¯s assumptions the retransmission was carried out by multicasts with MuMuDVB software. The network was built with Allied Telesis switches, which were available in the institute and which operated the IGMP protocol. A user could watch digital television via Stalker middleware and the MAG 250 decoder. The paper includes a review of methods employed in audio and video data compression. The conditional access system which provides the access to the contents broadcast only by the authorized users was described. The analysis of available sources of signals transmitted to the headend was performed along with the description of the DVB-T, DVB-S and an IP exchange point. Methods concerning audiovisual data transmission in IP networks were discussed and multicast protocols, IGMP, UDP and RTP were described. The commercial solutions for the headend, which require 15 000 PLN in order to operate three digital terrestrial multiplexes, were presented. In the project the open-source software was used in order to minimize expenses to the purchase of three DVB-T tuners, which are available on the market for approximately 150 PLN. A list of decoders employed in the IPTV networks was created showing their direction of development. The latest implementations are based on the Android system and comprise the multimedia centre with thousands of applications and games. The MAG 250 decoder is built on the Linux while the Stalker middleware is viewed in the browser integrated with hardware by the procedures called with the JavaScript. In the last chapters of the paper there are assumptions and requirements for the project and its implementation. There is a step-by-step description of the construction of IP based network, implementation of the headend and the process of Stalker¡¯s installation and configuration. In the last part of the paper author summarizes whole thesis and describes plans for further development of the project.

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Piotr Madej - Engineering Thesis Summary

  • 1. 48 Summary Transmission of the digital television via IP network is the next step in the development of the broadcasting platforms. This full service digital solution gradually replaces the terrestrial, satellite and cable television. The IPTV service shares many properties with the OTT (Over The Top) service, e.g. YouTube, Netflix however, it does not guarantee the quality of service using the Internet instead of a dedicated network. The aim of this engineering thesis is to design and implement a headend and an IP infrastructure which would allow for a transmission of a television signal. The headend has been receiving television channels from three free-to-air multiplexes broadcast by the digital terrestrial television DVB-T MT4171 Media-Tech receivers. According to the subject¡¯s assumptions the retransmission was carried out by multicasts with MuMuDVB software. The network was built with Allied Telesis switches, which were available in the institute and which operated the IGMP protocol. A user could watch digital television via Stalker middleware and the MAG 250 decoder. The paper includes a review of methods employed in audio and video data compression. The conditional access system which provides the access to the contents broadcast only by the authorized users was described. The analysis of available sources of signals transmitted to the headend was performed along with the description of the DVB-T, DVB-S and an IP exchange point. Methods concerning audiovisual data transmission in IP networks were discussed and multicast protocols, IGMP, UDP and RTP were described. The commercial solutions for the headend, which require 15 000 PLN in order to operate three digital terrestrial multiplexes, were presented. In the project the open-source software was used in order to minimize expenses to the purchase of three DVB-T tuners, which are available on the market for approximately 150 PLN. A list of decoders employed in the IPTV networks was created showing their direction of development. The latest implementations are based on the Android system and comprise the multimedia centre with thousands of applications and games. The MAG 250 decoder is built on the Linux while the Stalker middleware is viewed in the browser integrated with hardware by the procedures called with the JavaScript. In the last chapters of the paper there are assumptions and requirements for the project and its implementation. There is a step-by-step description of the construction of IP based network, implementation of the headend and the process of Stalker¡¯s installation and configuration. In the last part of the paper author summarizes whole thesis and describes plans for further development of the project.