Wyniki wyszukiwania - BazTech

1

A New Parameterized Model for Determining Quality of Online Video Service Using Modern H.265/HEVC and VP9 Codecs

Uhl Tadeus, Hoppe Christian

Journal of Telecommunications and Information Technology

|

2020

|

nr 4

72--78

EN

This paper describes a new measurement method (VS model) for determining the quality of online video services relying on modern H.265/HEVC and VP9 codecs. The said method has been developed on the basis of VQuad-HD curves (according to ITU-T J.341). This model does not refer to signal analysis, but protocol analysis instead. The parameters used are: type of video codec, encoding rate, transport technique, packet loss and burst size. The method may be implemented quickly and easily, which is one of the great advantages when using this method to measure QoS.

2

A Comparison Study of DASH Technique by Video Streaming over IP with the Use of RTP and HTTP Protocols

Hoppe Christian, Uhl Tadeus

Journal of Telecommunications and Information Technology

|

2020

|

nr 1

70--75

EN

Today’s Internet knows no bounds. New applications are marketed every single day. Many of them incorporate video sequences. These must be transported over the Internet quickly (often in real time). However, the Internet has not been designed for live communications and, regrettably, this may become apparent all too quickly. Countermeasures are required in the form of new, eﬃcient transport techniques facilitating online video services. MPEG-DASH is one of such modern techniques. But how good is this new technique really? This paper delves into the matter. The paper contains an analysis of the impact that the new technology exerts on the quality of video streaming over IP networks. It also describes a new numerical tool – QoSCalc (DASH-HTTP) which has been used to analyze MPEG-DASH under diﬀerent use scenarios. The results are presented graphically and their interpretation is provided

3

Suitability of Transport Techniques for Video Transmission in IP Networks

Uhl Tadeus, Klink Janusz, Hoppe Christian

International Journal of Electronics and Telecommunications

|

2020

|

Vol. 66, No. 1

133--138

EN

The paper discusses the problem of video transmission in an IP network. The authors consider the ability of using the most popular video codecs that use both the MPEG2 Transport Stream and Dynamic Adaptive Streaming over Hypertext Transfer Protocol (DASH). The main emphasis was given to ensuring the quality of service and quality assessment methods, taking into account not only the service- or network provider’s point of view but also the end user’s perspective. Two quality assessment approaches were presented, i.e. objective and subjective methods. The authors presented the results of the quality evaluation for H.264/MPEG-4, H.265/HEVC and VP9 codecs.The objective measurements, proved by statistic alanalysis of user opinion scores, conﬁrmed the ability of using H.265 and VP9 codecs in both real time and streaming transmissions, while the quality of video streaming over HTTP with the H.264 codec proved inadequate. The authors also presented a connection between the dynamics of network bandwidth changing and MPEG-DASH mechanism operation and their inﬂuence on the quality experienced by users.

4

Porównanie pracy technik transportowych wideo w środowisku IP

Uhl Tadeus, Klink Janusz, Hoppe Christian

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2019

|

nr 7

595--598, CD

PL

Transmisja wideo generuje w Internecie znaczący ruch. Jest ona stosowana zarówno w usługach czasu rzeczywistego jak i w usługach streamingowych, w których czas rzeczywisty nie odgrywa pierwszoplanowej roli. Internet jest zawodną platformą transportową. To może powodować obniżenie jakości usług. Aby wyjść temu naprzeciw, potrzebne są odpowiednio dobrane techniki transportowe dla strumieni wideo. Najczęściej używane są obecnie: MPEG2-TS i MPEG-DASH. Niniejsza praca zawiera wyniki badań oceniających wydajność obu tych technik transportowych w środowisku IP w powiązaniu z najnowszymi kodekami wideo, tj. H.265 i VP9.

EN

Video applications generate considerable traffic in the Internet. The video service is used for both real-time services and streaming services where time does not play primary role. The Internet is an unreliable transport platform. It can cause deterioration in quality of service. Excellently tuned transport techniques are needed to counter this. Currently, MPEG2-TS and MPEG-DASH are two such techniques. This paper contains analysis results that prove the capabilities of both transport techniques when used in conjunction with modern video codecs, namely H.265 and VP9.